List Message Batches

beta.messages.batches.list() -> SyncPage[BetaMessageBatch]

get/v1/messages/batches?beta=true

List all Message Batches within a Workspace. Most recently created batches are returned first.

Learn more about the Message Batches API in our user guide

ParametersExpand Collapse

after_id: Optional[str]

ID of the object to use as a cursor for pagination. When provided, returns the page of results immediately after this object.

before_id: Optional[str]

ID of the object to use as a cursor for pagination. When provided, returns the page of results immediately before this object.

limit: Optional[int]

Number of items to return per page.

Defaults to 20. Ranges from 1 to 1000.

maximum1000

minimum1

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", 15 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"

"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"

List Message Batches

Python

from anthropic import Anthropic

client = Anthropic(
    api_key="my-anthropic-api-key",
)
page = client.beta.messages.batches.list()
page = page.data[0]
print(page.id)

{
  "data": [
    {
      "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"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

Returns Examples

{
  "data": [
    {
      "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"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

List Message Batches

beta.messages.batches.list() -> SyncPage[BetaMessageBatch]

get/v1/messages/batches?beta=true

List all Message Batches within a Workspace. Most recently created batches are returned first.

Learn more about the Message Batches API in our user guide

ParametersExpand Collapse

after_id: Optional[str]

ID of the object to use as a cursor for pagination. When provided, returns the page of results immediately after this object.

before_id: Optional[str]

ID of the object to use as a cursor for pagination. When provided, returns the page of results immediately before this object.

limit: Optional[int]

Number of items to return per page.

Defaults to 20. Ranges from 1 to 1000.

maximum1000

minimum1

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", 15 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"

"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"

List Message Batches

Python

from anthropic import Anthropic

client = Anthropic(
    api_key="my-anthropic-api-key",
)
page = client.beta.messages.batches.list()
page = page.data[0]
print(page.id)

{
  "data": [
    {
      "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"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

Returns Examples

{
  "data": [
    {
      "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"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id"
}

List Message Batches

ParametersExpand Collapse

ReturnsExpand Collapse

List Message Batches

Returns Examples

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List Message Batches

ParametersExpand Collapse

ReturnsExpand Collapse

List Message Batches

Returns Examples

Products

Features

Models

Solutions

Claude Developer Platform

Learn

Company

Help and security

Terms and policies