Retrieve Message Batch results
Streams the results of a Message Batch as a .jsonl file.
Each line in the file is a JSON object containing the result of a single request in the Message Batch. Results are not guaranteed to be in the same order as requests. Use the custom_id field to match results to requests.
Learn more about the Message Batches API in our user guide
ParametersExpand Collapse
BatchResultsParams parameters
ID of the Message Batch.
ReturnsExpand Collapse
class MessageBatchIndividualResponse:This is a single line in the response .jsonl file and does not represent the response as a whole.
This is a single line in the response .jsonl file and does not represent the response as a whole.
required string CustomIDDeveloper-provided ID created for each request in a Message Batch. Useful for matching results to requests, as results may be given out of request order.
Developer-provided ID created for each request in a Message Batch. Useful for matching results to requests, as results may be given out of request order.
Must be unique for each request within the Message Batch.
required MessageBatchResult ResultProcessing result for this request.
Processing result for this request.
Contains a Message output if processing was successful, an error response if processing failed, or the reason why processing was not attempted, such as cancellation or expiration.
class MessageBatchSucceededResult:
required Message Message
required string IDUnique object identifier.
Unique object identifier.
The format and length of IDs may change over time.
required Container? ContainerInformation about the container used in the request (for the code execution tool)
Information about the container used in the request (for the code execution tool)
Identifier for the container used in this request
The time at which the container will expire.
required IReadOnlyList<ContentBlock> ContentContent generated by the model.
Content generated by the model.
This is an array of content blocks, each of which has a type that determines its shape.
Example:
[{"type": "text", "text": "Hi, I'm Claude."}]
If the request input messages ended with an assistant turn, then the response content will continue directly from that last turn. You can use this to constrain the model's output.
For example, if the input messages were:
[
{"role": "user", "content": "What's the Greek name for Sun? (A) Sol (B) Helios (C) Sun"},
{"role": "assistant", "content": "The best answer is ("}
]
Then the response content might be:
[{"type": "text", "text": "B)"}]
class TextBlock:
required IReadOnlyList<TextCitation>? CitationsCitations supporting the text block.
Citations supporting the text block.
The type of citation returned will depend on the type of document being cited. Citing a PDF results in page_location, plain text results in char_location, and content document results in content_block_location.
class CitationCharLocation:
class CitationPageLocation:
class CitationContentBlockLocation:
class CitationsWebSearchResultLocation:
class CitationsSearchResultLocation:
class ThinkingBlock:
class RedactedThinkingBlock:
class ToolUseBlock:
required Caller CallerTool invocation directly from the model.
Tool invocation directly from the model.
class DirectCaller:Tool invocation directly from the model.
Tool invocation directly from the model.
class ServerToolCaller:Tool invocation generated by a server-side tool.
Tool invocation generated by a server-side tool.
class ServerToolCaller20260120:
class ServerToolUseBlock:
required Caller CallerTool invocation directly from the model.
Tool invocation directly from the model.
class DirectCaller:Tool invocation directly from the model.
Tool invocation directly from the model.
class ServerToolCaller:Tool invocation generated by a server-side tool.
Tool invocation generated by a server-side tool.
class ServerToolCaller20260120:
required Name Name
class WebSearchToolResultBlock:
required Caller CallerTool invocation directly from the model.
Tool invocation directly from the model.
class DirectCaller:Tool invocation directly from the model.
Tool invocation directly from the model.
class ServerToolCaller:Tool invocation generated by a server-side tool.
Tool invocation generated by a server-side tool.
class ServerToolCaller20260120:
required WebSearchToolResultBlockContent Content
class WebSearchToolResultError:
required WebSearchToolResultErrorCode ErrorCode
IReadOnlyList<WebSearchResultBlock>
class WebFetchToolResultBlock:
required Caller CallerTool invocation directly from the model.
Tool invocation directly from the model.
class DirectCaller:Tool invocation directly from the model.
Tool invocation directly from the model.
class ServerToolCaller:Tool invocation generated by a server-side tool.
Tool invocation generated by a server-side tool.
class ServerToolCaller20260120:
required Content Content
class WebFetchToolResultErrorBlock:
required WebFetchToolResultErrorCode ErrorCode
class WebFetchBlock:
required DocumentBlock Content
required CitationsConfig? CitationsCitation configuration for the document
Citation configuration for the document
required Source Source
class Base64PdfSource:
class PlainTextSource:
The title of the document
ISO 8601 timestamp when the content was retrieved
Fetched content URL
class CodeExecutionToolResultBlock:
required CodeExecutionToolResultBlockContent ContentCode execution result with encrypted stdout for PFC + web_search results.
Code execution result with encrypted stdout for PFC + web_search results.
class CodeExecutionToolResultError:
required CodeExecutionToolResultErrorCode ErrorCode
class CodeExecutionResultBlock:
required IReadOnlyList<CodeExecutionOutputBlock> Content
class EncryptedCodeExecutionResultBlock:Code execution result with encrypted stdout for PFC + web_search results.
Code execution result with encrypted stdout for PFC + web_search results.
required IReadOnlyList<CodeExecutionOutputBlock> Content
class BashCodeExecutionToolResultBlock:
required Content Content
class BashCodeExecutionToolResultError:
required BashCodeExecutionToolResultErrorCode ErrorCode
class BashCodeExecutionResultBlock:
required IReadOnlyList<BashCodeExecutionOutputBlock> Content
class TextEditorCodeExecutionToolResultBlock:
required Content Content
class TextEditorCodeExecutionToolResultError:
required TextEditorCodeExecutionToolResultErrorCode ErrorCode
class TextEditorCodeExecutionViewResultBlock:
required FileType FileType
class TextEditorCodeExecutionCreateResultBlock:
class TextEditorCodeExecutionStrReplaceResultBlock:
class ToolSearchToolResultBlock:
required Content Content
class ToolSearchToolResultError:
required ToolSearchToolResultErrorCode ErrorCode
class ToolSearchToolSearchResultBlock:
required IReadOnlyList<ToolReferenceBlock> ToolReferences
class ContainerUploadBlock:Response model for a file uploaded to the container.
Response model for a file uploaded to the container.
required Model ModelThe model that will complete your prompt.
The model that will complete your prompt.
See models for additional details and options.
Most intelligent model for building agents and coding
Frontier intelligence at scale — built for coding, agents, and enterprise workflows
Premium model combining maximum intelligence with practical performance
Premium model combining maximum intelligence with practical performance
High-performance model with early extended thinking
High-performance model with early extended thinking
Fastest and most compact model for near-instant responsiveness
Our fastest model
Hybrid model, capable of near-instant responses and extended thinking
Hybrid model, capable of near-instant responses and extended thinking
High-performance model with extended thinking
High-performance model with extended thinking
High-performance model with extended thinking
Our best model for real-world agents and coding
Our best model for real-world agents and coding
Our most capable model
Our most capable model
Our most capable model
Our most capable model
Excels at writing and complex tasks
Excels at writing and complex tasks
Our previous most fast and cost-effective
JsonElement Role "assistant"constantConversational role of the generated message.
Conversational role of the generated message.
This will always be "assistant".
required StopReason? StopReasonThe reason that we stopped.
The reason that we stopped.
This may be one the following values:
"end_turn": the model reached a natural stopping point"max_tokens": we exceeded the requestedmax_tokensor the model's maximum"stop_sequence": one of your provided customstop_sequenceswas generated"tool_use": the model invoked one or more tools"pause_turn": we paused a long-running turn. You may provide the response back as-is in a subsequent request to let the model continue."refusal": when streaming classifiers intervene to handle potential policy violations
In non-streaming mode this value is always non-null. In streaming mode, it is null in the message_start event and non-null otherwise.
required string? StopSequenceWhich custom stop sequence was generated, if any.
Which custom stop sequence was generated, if any.
This value will be a non-null string if one of your custom stop sequences was generated.
JsonElement Type "message"constantObject type.
Object type.
For Messages, this is always "message".
required Usage UsageBilling and rate-limit usage.
Billing and rate-limit usage.
Anthropic's API bills and rate-limits by token counts, as tokens represent the underlying cost to our systems.
Under the hood, the API transforms requests into a format suitable for the model. The model's output then goes through a parsing stage before becoming an API response. As a result, the token counts in usage will not match one-to-one with the exact visible content of an API request or response.
For example, output_tokens will be non-zero, even for an empty string response from Claude.
Total input tokens in a request is the summation of input_tokens, cache_creation_input_tokens, and cache_read_input_tokens.
required CacheCreation? CacheCreationBreakdown of cached tokens by TTL
Breakdown of cached tokens by TTL
The number of input tokens used to create the 1 hour cache entry.
The number of input tokens used to create the 5 minute cache entry.
The number of input tokens used to create the cache entry.
The number of input tokens read from the cache.
The geographic region where inference was performed for this request.
The number of input tokens which were used.
The number of output tokens which were used.
required ServerToolUsage? ServerToolUseThe number of server tool requests.
The number of server tool requests.
The number of web fetch tool requests.
The number of web search tool requests.
required ServiceTier? ServiceTierIf the request used the priority, standard, or batch tier.
If the request used the priority, standard, or batch tier.
class MessageBatchErroredResult:
required ErrorResponse Error
required ErrorObject Error
class InvalidRequestError:
class AuthenticationError:
class BillingError:
class PermissionError:
class NotFoundError:
class RateLimitError:
class GatewayTimeoutError:
class ApiErrorObject:
class OverloadedError:
class MessageBatchCanceledResult:
class MessageBatchExpiredResult:
BatchResultsParams parameters = new() { MessageBatchID = "message_batch_id" };
await foreach (var messageBatchIndividualResponse in client.Messages.Batches.ResultsStreaming(parameters))
{
Console.WriteLine(messageBatchIndividualResponse);
}