Retrieve a Message Batch

beta().messages().batches().retrieve(, ) : BetaMessageBatch

get/v1/messages/batches/{message_batch_id}

This endpoint is idempotent and can be used to poll for Message Batch completion. To access the results of a Message Batch, make a request to the results_url field in the response.

Learn more about the Message Batches API in our user guide

ParametersExpand Collapse

params: BatchRetrieveParams

messageBatchId: Optional<String>

ID of the Message Batch.

betas: Optional<List<AnthropicBeta>>

Optional header to specify the beta version(s) you want to use.

MESSAGE_BATCHES_2024_09_24("message-batches-2024-09-24")

PROMPT_CACHING_2024_07_31("prompt-caching-2024-07-31")

COMPUTER_USE_2024_10_22("computer-use-2024-10-22")

COMPUTER_USE_2025_01_24("computer-use-2025-01-24")

PDFS_2024_09_25("pdfs-2024-09-25")

TOKEN_COUNTING_2024_11_01("token-counting-2024-11-01")

TOKEN_EFFICIENT_TOOLS_2025_02_19("token-efficient-tools-2025-02-19")

OUTPUT_128K_2025_02_19("output-128k-2025-02-19")

FILES_API_2025_04_14("files-api-2025-04-14")

MCP_CLIENT_2025_04_04("mcp-client-2025-04-04")

MCP_CLIENT_2025_11_20("mcp-client-2025-11-20")

DEV_FULL_THINKING_2025_05_14("dev-full-thinking-2025-05-14")

INTERLEAVED_THINKING_2025_05_14("interleaved-thinking-2025-05-14")

CODE_EXECUTION_2025_05_22("code-execution-2025-05-22")

EXTENDED_CACHE_TTL_2025_04_11("extended-cache-ttl-2025-04-11")

CONTEXT_1M_2025_08_07("context-1m-2025-08-07")

CONTEXT_MANAGEMENT_2025_06_27("context-management-2025-06-27")

MODEL_CONTEXT_WINDOW_EXCEEDED_2025_08_26("model-context-window-exceeded-2025-08-26")

SKILLS_2025_10_02("skills-2025-10-02")

ReturnsExpand Collapse

class BetaMessageBatch:

id: String

Unique object identifier.

The format and length of IDs may change over time.

archivedAt: Optional<LocalDateTime>

RFC 3339 datetime string representing the time at which the Message Batch was archived and its results became unavailable.

formatdate-time

cancelInitiatedAt: Optional<LocalDateTime>

RFC 3339 datetime string representing the time at which cancellation was initiated for the Message Batch. Specified only if cancellation was initiated.

formatdate-time

createdAt: LocalDateTime

RFC 3339 datetime string representing the time at which the Message Batch was created.

formatdate-time

endedAt: Optional<LocalDateTime>

RFC 3339 datetime string representing the time at which processing for the Message Batch ended. Specified only once processing ends.

Processing ends when every request in a Message Batch has either succeeded, errored, canceled, or expired.

formatdate-time

expiresAt: LocalDateTime

RFC 3339 datetime string representing the time at which the Message Batch will expire and end processing, which is 24 hours after creation.

formatdate-time

processingStatus: ProcessingStatus

Processing status of the Message Batch.

Accepts one of the following:

IN_PROGRESS("in_progress")

CANCELING("canceling")

ENDED("ended")

requestCounts: BetaMessageBatchRequestCounts

Tallies requests within the Message Batch, categorized by their status.

Requests start as processing and move to one of the other statuses only once processing of the entire batch ends. The sum of all values always matches the total number of requests in the batch.

canceled: Long

Number of requests in the Message Batch that have been canceled.

This is zero until processing of the entire Message Batch has ended.

errored: Long

Number of requests in the Message Batch that encountered an error.

This is zero until processing of the entire Message Batch has ended.

expired: Long

Number of requests in the Message Batch that have expired.

This is zero until processing of the entire Message Batch has ended.

processing: Long

Number of requests in the Message Batch that are processing.

succeeded: Long

Number of requests in the Message Batch that have completed successfully.

This is zero until processing of the entire Message Batch has ended.

resultsUrl: Optional<String>

URL to a .jsonl file containing the results of the Message Batch requests. Specified only once processing ends.

Results in the file are not guaranteed to be in the same order as requests. Use the custom_id field to match results to requests.

type: JsonValue;

Object type.

For Message Batches, this is always "message_batch".

Accepts one of the following:

MESSAGE_BATCH("message_batch")

Retrieve a Message Batch

package com.anthropic.example

import com.anthropic.client.AnthropicClient
import com.anthropic.client.okhttp.AnthropicOkHttpClient
import com.anthropic.models.beta.messages.batches.BatchRetrieveParams
import com.anthropic.models.beta.messages.batches.BetaMessageBatch

fun main() {
    val client: AnthropicClient = AnthropicOkHttpClient.fromEnv()

    val betaMessageBatch: BetaMessageBatch = client.beta().messages().batches().retrieve("message_batch_id")
}

Response 200

{
  "id": "msgbatch_013Zva2CMHLNnXjNJJKqJ2EF",
  "archived_at": "2024-08-20T18:37:24.100435Z",
  "cancel_initiated_at": "2024-08-20T18:37:24.100435Z",
  "created_at": "2024-08-20T18:37:24.100435Z",
  "ended_at": "2024-08-20T18:37:24.100435Z",
  "expires_at": "2024-08-20T18:37:24.100435Z",
  "processing_status": "in_progress",
  "request_counts": {
    "canceled": 10,
    "errored": 30,
    "expired": 10,
    "processing": 100,
    "succeeded": 50
  },
  "results_url": "https://api.anthropic.com/v1/messages/batches/msgbatch_013Zva2CMHLNnXjNJJKqJ2EF/results",
  "type": "message_batch"
}

Returns Examples

Response 200

{
  "id": "msgbatch_013Zva2CMHLNnXjNJJKqJ2EF",
  "archived_at": "2024-08-20T18:37:24.100435Z",
  "cancel_initiated_at": "2024-08-20T18:37:24.100435Z",
  "created_at": "2024-08-20T18:37:24.100435Z",
  "ended_at": "2024-08-20T18:37:24.100435Z",
  "expires_at": "2024-08-20T18:37:24.100435Z",
  "processing_status": "in_progress",
  "request_counts": {
    "canceled": 10,
    "errored": 30,
    "expired": 10,
    "processing": 100,
    "succeeded": 50
  },
  "results_url": "https://api.anthropic.com/v1/messages/batches/msgbatch_013Zva2CMHLNnXjNJJKqJ2EF/results",
  "type": "message_batch"
}

package com.anthropic.example import com.anthropic.client.AnthropicClient import com.anthropic.client.okhttp.AnthropicOkHttpClient import com.anthropic.models.beta.messages.batches.BatchRetrieveParams import com.anthropic.models.beta.messages.batches.BetaMessageBatch fun main() { val client: AnthropicClient = AnthropicOkHttpClient.fromEnv() val betaMessageBatch: BetaMessageBatch = client.beta().messages().batches().retrieve("message_batch_id") }

{ "id": "msgbatch_013Zva2CMHLNnXjNJJKqJ2EF", "archived_at": "2024-08-20T18:37:24.100435Z", "cancel_initiated_at": "2024-08-20T18:37:24.100435Z", "created_at": "2024-08-20T18:37:24.100435Z", "ended_at": "2024-08-20T18:37:24.100435Z", "expires_at": "2024-08-20T18:37:24.100435Z", "processing_status": "in_progress", "request_counts": { "canceled": 10, "errored": 30, "expired": 10, "processing": 100, "succeeded": 50 }, "results_url": "https://api.anthropic.com/v1/messages/batches/msgbatch_013Zva2CMHLNnXjNJJKqJ2EF/results", "type": "message_batch" }