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

message_batch_id: str

ID of the Message Batch.

betas: Optional[List[AnthropicBetaParam]]

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

Accepts one of the following:

UnionMember0 = str

UnionMember1 = Literal["message-batches-2024-09-24", "prompt-caching-2024-07-31", "computer-use-2024-10-22", 16 more]

Accepts one of the following:

"message-batches-2024-09-24"

"prompt-caching-2024-07-31"

"computer-use-2024-10-22"

"computer-use-2025-01-24"

"pdfs-2024-09-25"

"token-counting-2024-11-01"

"token-efficient-tools-2025-02-19"

"output-128k-2025-02-19"

"files-api-2025-04-14"

"mcp-client-2025-04-04"

"mcp-client-2025-11-20"

"dev-full-thinking-2025-05-14"

"interleaved-thinking-2025-05-14"

"code-execution-2025-05-22"

"extended-cache-ttl-2025-04-11"

"context-1m-2025-08-07"

"context-management-2025-06-27"

"model-context-window-exceeded-2025-08-26"

"skills-2025-10-02"

ReturnsExpand Collapse

class BetaMessageBatch: …

id: str

Unique object identifier.

The format and length of IDs may change over time.

archived_at: Optional[datetime]

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

formatdate-time

cancel_initiated_at: Optional[datetime]

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

formatdate-time

created_at: datetime

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

formatdate-time

ended_at: Optional[datetime]

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

expires_at: datetime

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

processing_status: Literal["in_progress", "canceling", "ended"]

Processing status of the Message Batch.

Accepts one of the following:

"in_progress"

"canceling"

"ended"

request_counts: 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: int

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

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

errored: int

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

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

expired: int

Number of requests in the Message Batch that have expired.

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

processing: int

Number of requests in the Message Batch that are processing.

succeeded: int

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

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

results_url: Optional[str]

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: Literal["message_batch"]

Object type.

For Message Batches, this is always "message_batch".

Accepts one of the following:

"message_batch"

Retrieve a Message Batch

import os
from anthropic import Anthropic

client = Anthropic(
    api_key=os.environ.get("ANTHROPIC_API_KEY"),  # This is the default and can be omitted
)
beta_message_batch = client.beta.messages.batches.retrieve(
    message_batch_id="message_batch_id",
)
print(beta_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"
}

import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get("ANTHROPIC_API_KEY"), # This is the default and can be omitted ) beta_message_batch = client.beta.messages.batches.retrieve( message_batch_id="message_batch_id", ) print(beta_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" }