Streaming-Nachrichten

ErstellenModellfähigkeiten

Streaming von Nachrichten

Erfahren Sie, wie Sie Nachrichten mit Server-Sent Events streamen können

Beim Erstellen einer Message können Sie "stream": true setzen, um die Antwort inkrementell mit Server-Sent Events (SSE) zu streamen.

Streaming mit SDKs

Die Python und TypeScript SDKs bieten mehrere Möglichkeiten zum Streamen. Das PHP SDK bietet Streaming über createStream(). Das Python SDK ermöglicht sowohl synchrone als auch asynchrone Streams. Weitere Informationen finden Sie in der Dokumentation der einzelnen SDKs.

client = anthropic.Anthropic()

with client.messages.stream(
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
    model="claude-opus-4-7",
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Abrufen der endgültigen Nachricht ohne Verarbeitung von Ereignissen

Wenn Sie Text nicht bei seiner Ankunft verarbeiten müssen, bieten die SDKs eine Möglichkeit, Streaming im Hintergrund zu verwenden und gleichzeitig das vollständige Message-Objekt zurückzugeben, das mit .create() identisch ist. Dies ist besonders nützlich für Anfragen mit großen max_tokens-Werten, bei denen die SDKs Streaming benötigen, um HTTP-Timeouts zu vermeiden.

client = anthropic.Anthropic()

with client.messages.stream(
    max_tokens=128000,
    messages=[{"role": "user", "content": "Write a detailed analysis..."}],
    model="claude-opus-4-7",
) as stream:
    message = stream.get_final_message()

print(message.content[0].text)

Der .stream()-Aufruf hält die HTTP-Verbindung mit Server-Sent Events aktiv, dann sammelt .get_final_message() (Python) oder .finalMessage() (TypeScript) alle Ereignisse und gibt das vollständige Message-Objekt zurück. In Go rufen Sie message.Accumulate(event) in der Stream-Schleife auf, um die gleiche vollständige Message zu erstellen. In Java verwenden Sie MessageAccumulator.create() und rufen accumulator.accumulate(event) für jedes Ereignis auf. In Ruby rufen Sie .accumulated_message auf dem Stream auf. Im PHP SDK iterieren Sie manuell über Stream-Ereignisse, um die Antwort zu sammeln.

Ereignistypen

Jedes Server-Sent Event enthält einen benannten Ereignistyp und zugehörige JSON-Daten. Jedes Ereignis verwendet einen SSE-Ereignisnamen (z. B. event: message_stop) und enthält den entsprechenden Ereignis-type in seinen Daten.

Jeder Stream verwendet den folgenden Ereignisfluss:

message_start: enthält ein Message-Objekt mit leerem content.
Eine Reihe von Inhaltsblöcken, von denen jeder ein content_block_start, ein oder mehrere content_block_delta-Ereignisse und ein content_block_stop-Ereignis hat. Jeder Inhaltsblock hat einen index, der seinem Index im finalen Message-content-Array entspricht.
Ein oder mehrere message_delta-Ereignisse, die Änderungen auf oberster Ebene des finalen Message-Objekts anzeigen.
Ein finales message_stop-Ereignis.

Die Token-Zählungen, die im usage-Feld des message_delta-Ereignisses angezeigt werden, sind kumulativ.

Ping-Ereignisse

Ereignisströme können auch eine beliebige Anzahl von ping-Ereignissen enthalten.

Fehlerereignisse

Die API kann gelegentlich Fehler im Ereignisstrom senden. Beispielsweise können Sie während Zeiten hoher Auslastung einen overloaded_error erhalten, der normalerweise einem HTTP 529 in einem nicht-Streaming-Kontext entsprechen würde:

Example error

event: error
data: {"type": "error", "error": {"type": "overloaded_error", "message": "Overloaded"}}

Andere Ereignisse

Gemäß der Versionierungsrichtlinie können neue Ereignistypen hinzugefügt werden, und Ihr Code sollte unbekannte Ereignistypen elegant verarbeiten.

Content Block Delta-Typen

Jedes content_block_delta-Ereignis enthält ein delta eines Typs, der den content-Block bei einem bestimmten index aktualisiert.

Text Delta

Ein text Content Block Delta sieht wie folgt aus:

Text delta

event: content_block_delta
data: {"type": "content_block_delta","index": 0,"delta": {"type": "text_delta", "text": "ello frien"}}

Input JSON Delta

Die Deltas für tool_use Content Blocks entsprechen Updates für das input-Feld des Blocks. Um maximale Granularität zu unterstützen, sind die Deltas partielle JSON-Strings, während das finale tool_use.input immer ein Objekt ist.

Sie können die String-Deltas sammeln und das JSON einmal analysieren, wenn Sie ein content_block_stop-Ereignis erhalten, indem Sie eine Bibliothek wie Pydantic zur partiellen JSON-Analyse verwenden oder die SDKs verwenden, die Helfer für den Zugriff auf analysierte inkrementelle Werte bieten.

Ein tool_use Content Block Delta sieht wie folgt aus:

Input JSON delta

event: content_block_delta
data: {"type": "content_block_delta","index": 1,"delta": {"type": "input_json_delta","partial_json": "{\"location\": \"San Fra"}}

Hinweis: Aktuelle Modelle unterstützen nur das Ausgeben einer vollständigen Schlüssel- und Werteigenschaft aus input auf einmal. Daher kann es bei der Verwendung von Tools zu Verzögerungen zwischen Streaming-Ereignissen kommen, während das Modell arbeitet. Sobald ein input-Schlüssel und -Wert gesammelt sind, werden sie als mehrere content_block_delta-Ereignisse mit fragmentiertem partiellem JSON ausgegeben, damit das Format automatisch feinere Granularität in zukünftigen Modellen unterstützen kann.

Thinking Delta

Bei Verwendung von Extended Thinking mit aktiviertem Streaming erhalten Sie Thinking-Inhalte über thinking_delta-Ereignisse. Diese Deltas entsprechen dem thinking-Feld der thinking Content Blocks.

Für Thinking-Inhalte wird ein spezielles signature_delta-Ereignis kurz vor dem content_block_stop-Ereignis gesendet. Diese Signatur wird verwendet, um die Integrität des Thinking-Blocks zu überprüfen.

Wenn display: "omitted" in der Thinking-Konfiguration gesetzt ist, werden keine thinking_delta-Ereignisse gesendet. Der Thinking-Block öffnet sich, empfängt ein einzelnes signature_delta und schließt sich. Siehe Controlling thinking display.

Ein typisches Thinking Delta sieht wie folgt aus:

Thinking delta

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "I need to find the GCD of 1071 and 462 using the Euclidean algorithm.\n\n1071 = 2 × 462 + 147"}}

Das Signature Delta sieht wie folgt aus:

Signature delta

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "signature_delta", "signature": "EqQBCgIYAhIM1gbcDa9GJwZA2b3hGgxBdjrkzLoky3dl1pkiMOYds..."}}

Vollständige HTTP Stream-Antwort

Verwenden Sie die Client SDKs bei Verwendung des Streaming-Modus. Wenn Sie jedoch eine direkte API-Integration erstellen, müssen Sie diese Ereignisse selbst verarbeiten.

Eine Stream-Antwort besteht aus:

Einem message_start-Ereignis
Möglicherweise mehreren Inhaltsblöcken, von denen jeder enthält:
- Ein content_block_start-Ereignis
- Möglicherweise mehrere content_block_delta-Ereignisse
- Ein content_block_stop-Ereignis
Einem message_delta-Ereignis
Einem message_stop-Ereignis

Es können auch ping-Ereignisse über die gesamte Antwort verteilt sein. Weitere Details zum Format finden Sie unter Event types.

Grundlegende Streaming-Anfrage

client = anthropic.Anthropic()

with client.messages.stream(
    model="claude-opus-4-7",
    messages=[{"role": "user", "content": "Hello"}],
    max_tokens=256,
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Response

event: message_start
data: {"type": "message_start", "message": {"id": "msg_1nZdL29xx5MUA1yADyHTEsnR8uuvGzszyY", "type": "message", "role": "assistant", "content": [], "model": "claude-opus-4-7", "stop_reason": null, "stop_sequence": null, "usage": {"input_tokens": 25, "output_tokens": 1}}}

event: content_block_start
data: {"type": "content_block_start", "index": 0, "content_block": {"type": "text", "text": ""}}

event: ping
data: {"type": "ping"}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "text_delta", "text": "Hello"}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "text_delta", "text": "!"}}

event: content_block_stop
data: {"type": "content_block_stop", "index": 0}

event: message_delta
data: {"type": "message_delta", "delta": {"stop_reason": "end_turn", "stop_sequence":null}, "usage": {"output_tokens": 15}}

event: message_stop
data: {"type": "message_stop"}

Streaming-Anfrage mit Tool-Nutzung

Die Tool-Nutzung unterstützt feingranulares Streaming für Parameterwerte. Aktivieren Sie es pro Tool mit eager_input_streaming.

Diese Anfrage fordert Claude auf, ein Tool zu verwenden, um das Wetter zu melden.

client = anthropic.Anthropic()

tools = [
    {
        "name": "get_weather",
        "description": "Get the current weather in a given location",
        "input_schema": {
            "type": "object",
            "properties": {
                "location": {
                    "type": "string",
                    "description": "The city and state, e.g. San Francisco, CA",
                }
            },
            "required": ["location"],
        },
    }
]

with client.messages.stream(
    model="claude-opus-4-7",
    max_tokens=1024,
    tools=tools,
    tool_choice={"type": "any"},
    messages=[
        {"role": "user", "content": "What is the weather like in San Francisco?"}
    ],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Response

event: message_start
data: {"type":"message_start","message":{"id":"msg_014p7gG3wDgGV9EUtLvnow3U","type":"message","role":"assistant","model":"claude-opus-4-7","stop_sequence":null,"usage":{"input_tokens":472,"output_tokens":2},"content":[],"stop_reason":null}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: ping
data: {"type": "ping"}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Okay"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":","}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" let"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"'s"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" check"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" the"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" weather"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" for"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" San"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" Francisco"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":","}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" CA"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":":"}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: content_block_start
data: {"type":"content_block_start","index":1,"content_block":{"type":"tool_use","id":"toolu_01T1x1fJ34qAmk2tNTrN7Up6","name":"get_weather","input":{}}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"{\"location\":"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" \"San"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" Francisc"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"o,"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" CA\""}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":","}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" "}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"\"unit\": \"fah"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"renheit\"}"}}

event: content_block_stop
data: {"type":"content_block_stop","index":1}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"output_tokens":89}}

event: message_stop
data: {"type":"message_stop"}

Streaming-Anfrage mit erweitertem Denken

Diese Anfrage aktiviert erweitertes Denken mit Streaming, um Claudes schrittweise Überlegungen zu sehen.

client = anthropic.Anthropic()

with client.messages.stream(
    model="claude-opus-4-7",
    max_tokens=20000,
    thinking={"type": "adaptive", "display": "summarized"},
    messages=[
        {
            "role": "user",
            "content": "What is the greatest common divisor of 1071 and 462?",
        }
    ],
) as stream:
    for event in stream:
        if event.type == "content_block_delta":
            if event.delta.type == "thinking_delta":
                print(event.delta.thinking, end="", flush=True)
            elif event.delta.type == "text_delta":
                print(event.delta.text, end="", flush=True)

Response

event: message_start
data: {"type": "message_start", "message": {"id": "msg_01...", "type": "message", "role": "assistant", "content": [], "model": "claude-opus-4-7", "stop_reason": null, "stop_sequence": null}}

event: content_block_start
data: {"type": "content_block_start", "index": 0, "content_block": {"type": "thinking", "thinking": "", "signature": ""}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "I need to find the GCD of 1071 and 462 using the Euclidean algorithm.\n\n1071 = 2 × 462 + 147"}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "\n462 = 3 × 147 + 21"}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "\n147 = 7 × 21 + 0"}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "\nThe remainder is 0, so GCD(1071, 462) = 21."}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "signature_delta", "signature": "EqQBCgIYAhIM1gbcDa9GJwZA2b3hGgxBdjrkzLoky3dl1pkiMOYds..."}}

event: content_block_stop
data: {"type": "content_block_stop", "index": 0}

event: content_block_start
data: {"type": "content_block_start", "index": 1, "content_block": {"type": "text", "text": ""}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 1, "delta": {"type": "text_delta", "text": "The greatest common divisor of 1071 and 462 is **21**."}}

event: content_block_stop
data: {"type": "content_block_stop", "index": 1}

event: message_delta
data: {"type": "message_delta", "delta": {"stop_reason": "end_turn", "stop_sequence": null}}

event: message_stop
data: {"type": "message_stop"}

Streaming-Anfrage mit Web-Such-Tool-Nutzung

Diese Anfrage fordert Claude auf, das Web nach aktuellen Wetterinformationen zu durchsuchen.

client = anthropic.Anthropic()

with client.messages.stream(
    model="claude-opus-4-7",
    max_tokens=1024,
    tools=[{"type": "web_search_20250305", "name": "web_search", "max_uses": 5}],
    messages=[
        {"role": "user", "content": "What is the weather like in New York City today?"}
    ],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Response

event: message_start
data: {"type":"message_start","message":{"id":"msg_01G...","type":"message","role":"assistant","model":"claude-opus-4-7","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":2679,"cache_creation_input_tokens":0,"cache_read_input_tokens":0,"output_tokens":3}}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"I'll check"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" the current weather in New York City for you"}}

event: ping
data: {"type": "ping"}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"."}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: content_block_start
data: {"type":"content_block_start","index":1,"content_block":{"type":"server_tool_use","id":"srvtoolu_014hJH82Qum7Td6UV8gDXThB","name":"web_search","input":{}}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"{\"query"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"\":"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" \"weather"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" NY"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"C to"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"day\"}"}}

event: content_block_stop
data: {"type":"content_block_stop","index":1 }

event: content_block_start
data: {"type":"content_block_start","index":2,"content_block":{"type":"web_search_tool_result","tool_use_id":"srvtoolu_014hJH82Qum7Td6UV8gDXThB","content":[{"type":"web_search_result","title":"Weather in New York City in May 2025 (New York) - detailed Weather Forecast for a month","url":"https://world-weather.info/forecast/usa/new_york/may-2025/","encrypted_content":"Ev0DCioIAxgCIiQ3NmU4ZmI4OC1k...","page_age":null},...]}}

event: content_block_stop
data: {"type":"content_block_stop","index":2}

event: content_block_start
data: {"type":"content_block_start","index":3,"content_block":{"type":"text","text":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":3,"delta":{"type":"text_delta","text":"Here's the current weather information for New York"}}

event: content_block_delta
data: {"type":"content_block_delta","index":3,"delta":{"type":"text_delta","text":" City:\n\n# Weather"}}

event: content_block_delta
data: {"type":"content_block_delta","index":3,"delta":{"type":"text_delta","text":" in New York City"}}

event: content_block_delta
data: {"type":"content_block_delta","index":3,"delta":{"type":"text_delta","text":"\n\n"}}

...

event: content_block_stop
data: {"type":"content_block_stop","index":17}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null},"usage":{"input_tokens":10682,"cache_creation_input_tokens":0,"cache_read_input_tokens":0,"output_tokens":510,"server_tool_use":{"web_search_requests":1}}}

event: message_stop
data: {"type":"message_stop"}

Fehlerwiederherstellung

Claude 4.5 und früher

Für Claude 4.5-Modelle und früher können Sie eine Streaming-Anfrage, die aufgrund von Netzwerkproblemen, Timeouts oder anderen Fehlern unterbrochen wurde, wiederherstellen, indem Sie von der Stelle fortfahren, an der der Stream unterbrochen wurde. Dieser Ansatz spart Ihnen die Neuverarbeitung der gesamten Antwort.

Die grundlegende Wiederherstellungsstrategie umfasst:

Erfassen Sie die teilweise Antwort: Speichern Sie alle Inhalte, die erfolgreich empfangen wurden, bevor der Fehler auftrat
Konstruieren Sie eine Fortsetzungsanfrage: Erstellen Sie eine neue API-Anfrage, die die teilweise Assistentenantwort als Anfang einer neuen Assistentennachricht enthält
Setzen Sie das Streaming fort: Fahren Sie fort, den Rest der Antwort von der Stelle zu empfangen, an der sie unterbrochen wurde

Claude 4.6

Für Claude 4.6-Modelle sollten Sie eine Benutzernachricht hinzufügen, die das Modell anweist, von der Stelle fortzufahren, an der es aufgehört hat. Zum Beispiel:

Sample prompt

Your previous response was interrupted and ended with [previous_response]. Continue from where you left off.

Best Practices für die Fehlerwiederherstellung

Verwenden Sie SDK-Funktionen: Nutzen Sie die integrierten Funktionen des SDK für Nachrichtenakkumulation und Fehlerbehandlung
Behandeln Sie Inhaltstypen: Beachten Sie, dass Nachrichten mehrere Inhaltsblöcke enthalten können (text, tool_use, thinking). Tool-Use- und Extended-Thinking-Blöcke können nicht teilweise wiederhergestellt werden. Sie können das Streaming vom neuesten Textblock fortsetzen.

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ErstellenModellfähigkeiten

Streaming von Nachrichten

Erfahren Sie, wie Sie Nachrichten mit Server-Sent Events streamen können

Beim Erstellen einer Message können Sie "stream": true setzen, um die Antwort inkrementell mit Server-Sent Events (SSE) zu streamen.

Streaming mit SDKs

client = anthropic.Anthropic()

with client.messages.stream(
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
    model="claude-opus-4-7",
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Abrufen der endgültigen Nachricht ohne Verarbeitung von Ereignissen

client = anthropic.Anthropic()

with client.messages.stream(
    max_tokens=128000,
    messages=[{"role": "user", "content": "Write a detailed analysis..."}],
    model="claude-opus-4-7",
) as stream:
    message = stream.get_final_message()

print(message.content[0].text)

Ereignistypen

Jeder Stream verwendet den folgenden Ereignisfluss:

message_start: enthält ein Message-Objekt mit leerem content.
Eine Reihe von Inhaltsblöcken, von denen jeder ein content_block_start, ein oder mehrere content_block_delta-Ereignisse und ein content_block_stop-Ereignis hat. Jeder Inhaltsblock hat einen index, der seinem Index im finalen Message-content-Array entspricht.
Ein oder mehrere message_delta-Ereignisse, die Änderungen auf oberster Ebene des finalen Message-Objekts anzeigen.
Ein finales message_stop-Ereignis.

Die Token-Zählungen, die im usage-Feld des message_delta-Ereignisses angezeigt werden, sind kumulativ.

Ping-Ereignisse

Ereignisströme können auch eine beliebige Anzahl von ping-Ereignissen enthalten.

Fehlerereignisse

Example error

event: error
data: {"type": "error", "error": {"type": "overloaded_error", "message": "Overloaded"}}

Andere Ereignisse

Gemäß der Versionierungsrichtlinie können neue Ereignistypen hinzugefügt werden, und Ihr Code sollte unbekannte Ereignistypen elegant verarbeiten.

Content Block Delta-Typen

Jedes content_block_delta-Ereignis enthält ein delta eines Typs, der den content-Block bei einem bestimmten index aktualisiert.

Text Delta

Ein text Content Block Delta sieht wie folgt aus:

Text delta

event: content_block_delta
data: {"type": "content_block_delta","index": 0,"delta": {"type": "text_delta", "text": "ello frien"}}

Input JSON Delta

Ein tool_use Content Block Delta sieht wie folgt aus:

Input JSON delta

event: content_block_delta
data: {"type": "content_block_delta","index": 1,"delta": {"type": "input_json_delta","partial_json": "{\"location\": \"San Fra"}}

Thinking Delta

Ein typisches Thinking Delta sieht wie folgt aus:

Thinking delta

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "I need to find the GCD of 1071 and 462 using the Euclidean algorithm.\n\n1071 = 2 × 462 + 147"}}

Das Signature Delta sieht wie folgt aus:

Signature delta

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "signature_delta", "signature": "EqQBCgIYAhIM1gbcDa9GJwZA2b3hGgxBdjrkzLoky3dl1pkiMOYds..."}}

Vollständige HTTP Stream-Antwort

Verwenden Sie die Client SDKs bei Verwendung des Streaming-Modus. Wenn Sie jedoch eine direkte API-Integration erstellen, müssen Sie diese Ereignisse selbst verarbeiten.

Eine Stream-Antwort besteht aus:

Einem message_start-Ereignis
Möglicherweise mehreren Inhaltsblöcken, von denen jeder enthält:
- Ein content_block_start-Ereignis
- Möglicherweise mehrere content_block_delta-Ereignisse
- Ein content_block_stop-Ereignis
Einem message_delta-Ereignis
Einem message_stop-Ereignis

Es können auch ping-Ereignisse über die gesamte Antwort verteilt sein. Weitere Details zum Format finden Sie unter Event types.

Grundlegende Streaming-Anfrage

client = anthropic.Anthropic()

with client.messages.stream(
    model="claude-opus-4-7",
    messages=[{"role": "user", "content": "Hello"}],
    max_tokens=256,
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Response

event: message_start
data: {"type": "message_start", "message": {"id": "msg_1nZdL29xx5MUA1yADyHTEsnR8uuvGzszyY", "type": "message", "role": "assistant", "content": [], "model": "claude-opus-4-7", "stop_reason": null, "stop_sequence": null, "usage": {"input_tokens": 25, "output_tokens": 1}}}

event: content_block_start
data: {"type": "content_block_start", "index": 0, "content_block": {"type": "text", "text": ""}}

event: ping
data: {"type": "ping"}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "text_delta", "text": "Hello"}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "text_delta", "text": "!"}}

event: content_block_stop
data: {"type": "content_block_stop", "index": 0}

event: message_delta
data: {"type": "message_delta", "delta": {"stop_reason": "end_turn", "stop_sequence":null}, "usage": {"output_tokens": 15}}

event: message_stop
data: {"type": "message_stop"}

Streaming-Anfrage mit Tool-Nutzung

Die Tool-Nutzung unterstützt feingranulares Streaming für Parameterwerte. Aktivieren Sie es pro Tool mit eager_input_streaming.

Diese Anfrage fordert Claude auf, ein Tool zu verwenden, um das Wetter zu melden.

client = anthropic.Anthropic()

tools = [
    {
        "name": "get_weather",
        "description": "Get the current weather in a given location",
        "input_schema": {
            "type": "object",
            "properties": {
                "location": {
                    "type": "string",
                    "description": "The city and state, e.g. San Francisco, CA",
                }
            },
            "required": ["location"],
        },
    }
]

with client.messages.stream(
    model="claude-opus-4-7",
    max_tokens=1024,
    tools=tools,
    tool_choice={"type": "any"},
    messages=[
        {"role": "user", "content": "What is the weather like in San Francisco?"}
    ],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Response

event: message_start
data: {"type":"message_start","message":{"id":"msg_014p7gG3wDgGV9EUtLvnow3U","type":"message","role":"assistant","model":"claude-opus-4-7","stop_sequence":null,"usage":{"input_tokens":472,"output_tokens":2},"content":[],"stop_reason":null}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: ping
data: {"type": "ping"}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Okay"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":","}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" let"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"'s"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" check"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" the"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" weather"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" for"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" San"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" Francisco"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":","}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" CA"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":":"}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: content_block_start
data: {"type":"content_block_start","index":1,"content_block":{"type":"tool_use","id":"toolu_01T1x1fJ34qAmk2tNTrN7Up6","name":"get_weather","input":{}}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"{\"location\":"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" \"San"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" Francisc"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"o,"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" CA\""}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":","}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" "}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"\"unit\": \"fah"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"renheit\"}"}}

event: content_block_stop
data: {"type":"content_block_stop","index":1}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"output_tokens":89}}

event: message_stop
data: {"type":"message_stop"}

Streaming-Anfrage mit erweitertem Denken

Diese Anfrage aktiviert erweitertes Denken mit Streaming, um Claudes schrittweise Überlegungen zu sehen.

client = anthropic.Anthropic()

with client.messages.stream(
    model="claude-opus-4-7",
    max_tokens=20000,
    thinking={"type": "adaptive", "display": "summarized"},
    messages=[
        {
            "role": "user",
            "content": "What is the greatest common divisor of 1071 and 462?",
        }
    ],
) as stream:
    for event in stream:
        if event.type == "content_block_delta":
            if event.delta.type == "thinking_delta":
                print(event.delta.thinking, end="", flush=True)
            elif event.delta.type == "text_delta":
                print(event.delta.text, end="", flush=True)

Response

event: message_start
data: {"type": "message_start", "message": {"id": "msg_01...", "type": "message", "role": "assistant", "content": [], "model": "claude-opus-4-7", "stop_reason": null, "stop_sequence": null}}

event: content_block_start
data: {"type": "content_block_start", "index": 0, "content_block": {"type": "thinking", "thinking": "", "signature": ""}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "I need to find the GCD of 1071 and 462 using the Euclidean algorithm.\n\n1071 = 2 × 462 + 147"}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "\n462 = 3 × 147 + 21"}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "\n147 = 7 × 21 + 0"}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "\nThe remainder is 0, so GCD(1071, 462) = 21."}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 0, "delta": {"type": "signature_delta", "signature": "EqQBCgIYAhIM1gbcDa9GJwZA2b3hGgxBdjrkzLoky3dl1pkiMOYds..."}}

event: content_block_stop
data: {"type": "content_block_stop", "index": 0}

event: content_block_start
data: {"type": "content_block_start", "index": 1, "content_block": {"type": "text", "text": ""}}

event: content_block_delta
data: {"type": "content_block_delta", "index": 1, "delta": {"type": "text_delta", "text": "The greatest common divisor of 1071 and 462 is **21**."}}

event: content_block_stop
data: {"type": "content_block_stop", "index": 1}

event: message_delta
data: {"type": "message_delta", "delta": {"stop_reason": "end_turn", "stop_sequence": null}}

event: message_stop
data: {"type": "message_stop"}

Streaming-Anfrage mit Web-Such-Tool-Nutzung

Diese Anfrage fordert Claude auf, das Web nach aktuellen Wetterinformationen zu durchsuchen.

client = anthropic.Anthropic()

with client.messages.stream(
    model="claude-opus-4-7",
    max_tokens=1024,
    tools=[{"type": "web_search_20250305", "name": "web_search", "max_uses": 5}],
    messages=[
        {"role": "user", "content": "What is the weather like in New York City today?"}
    ],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Response

event: message_start
data: {"type":"message_start","message":{"id":"msg_01G...","type":"message","role":"assistant","model":"claude-opus-4-7","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":2679,"cache_creation_input_tokens":0,"cache_read_input_tokens":0,"output_tokens":3}}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"I'll check"}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":" the current weather in New York City for you"}}

event: ping
data: {"type": "ping"}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"."}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: content_block_start
data: {"type":"content_block_start","index":1,"content_block":{"type":"server_tool_use","id":"srvtoolu_014hJH82Qum7Td6UV8gDXThB","name":"web_search","input":{}}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"{\"query"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"\":"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" \"weather"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":" NY"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"C to"}}

event: content_block_delta
data: {"type":"content_block_delta","index":1,"delta":{"type":"input_json_delta","partial_json":"day\"}"}}

event: content_block_stop
data: {"type":"content_block_stop","index":1 }

event: content_block_start
data: {"type":"content_block_start","index":2,"content_block":{"type":"web_search_tool_result","tool_use_id":"srvtoolu_014hJH82Qum7Td6UV8gDXThB","content":[{"type":"web_search_result","title":"Weather in New York City in May 2025 (New York) - detailed Weather Forecast for a month","url":"https://world-weather.info/forecast/usa/new_york/may-2025/","encrypted_content":"Ev0DCioIAxgCIiQ3NmU4ZmI4OC1k...","page_age":null},...]}}

event: content_block_stop
data: {"type":"content_block_stop","index":2}

event: content_block_start
data: {"type":"content_block_start","index":3,"content_block":{"type":"text","text":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":3,"delta":{"type":"text_delta","text":"Here's the current weather information for New York"}}

event: content_block_delta
data: {"type":"content_block_delta","index":3,"delta":{"type":"text_delta","text":" City:\n\n# Weather"}}

event: content_block_delta
data: {"type":"content_block_delta","index":3,"delta":{"type":"text_delta","text":" in New York City"}}

event: content_block_delta
data: {"type":"content_block_delta","index":3,"delta":{"type":"text_delta","text":"\n\n"}}

...

event: content_block_stop
data: {"type":"content_block_stop","index":17}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null},"usage":{"input_tokens":10682,"cache_creation_input_tokens":0,"cache_read_input_tokens":0,"output_tokens":510,"server_tool_use":{"web_search_requests":1}}}

event: message_stop
data: {"type":"message_stop"}

Fehlerwiederherstellung

Claude 4.5 und früher

Die grundlegende Wiederherstellungsstrategie umfasst:

Erfassen Sie die teilweise Antwort: Speichern Sie alle Inhalte, die erfolgreich empfangen wurden, bevor der Fehler auftrat
Konstruieren Sie eine Fortsetzungsanfrage: Erstellen Sie eine neue API-Anfrage, die die teilweise Assistentenantwort als Anfang einer neuen Assistentennachricht enthält
Setzen Sie das Streaming fort: Fahren Sie fort, den Rest der Antwort von der Stelle zu empfangen, an der sie unterbrochen wurde

Claude 4.6

Für Claude 4.6-Modelle sollten Sie eine Benutzernachricht hinzufügen, die das Modell anweist, von der Stelle fortzufahren, an der es aufgehört hat. Zum Beispiel:

Sample prompt

Your previous response was interrupted and ended with [previous_response]. Continue from where you left off.

Best Practices für die Fehlerwiederherstellung

Verwenden Sie SDK-Funktionen: Nutzen Sie die integrierten Funktionen des SDK für Nachrichtenakkumulation und Fehlerbehandlung
Behandeln Sie Inhaltstypen: Beachten Sie, dass Nachrichten mehrere Inhaltsblöcke enthalten können (text, tool_use, thinking). Tool-Use- und Extended-Thinking-Blöcke können nicht teilweise wiederhergestellt werden. Sie können das Streaming vom neuesten Textblock fortsetzen.

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