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# title: List Message Batches url: https://platform.claude.com/docs/en/api/beta/messages/batches/list

# List Message Batches

GET /v1/messages/batches

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

# Query parameters

  • after_id: optional string

    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 string

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

  • limit: optional number

    Number of items to return per page.

    Defaults to 20. Ranges from 1 to 1000.

    default: 20, maximum: 1000, minimum: 1

# Headers

  • "anthropic-beta": optional array of AnthropicBeta

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

    • string

    • "message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more

      • "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"

      • "fast-mode-2026-02-01"

      • "output-300k-2026-03-24"

      • "user-profiles-2026-03-24"

      • "user-profiles-2026-08-18"

      • "user-profiles-2026-09-04"

      • "advisor-tool-2026-03-01"

      • "managed-agents-2026-04-01"

      • "cache-diagnosis-2026-04-07"

      • "dreaming-2026-04-21"

      • "thinking-token-count-2026-05-13"

      • "server-side-fallback-2026-06-01"

      • "server-side-fallback-2026-07-01"

      • "fallback-credit-2026-06-01"

      • "fallback-credit-2026-07-01"

      • "agent-memory-2026-07-22"

      • "mid-conversation-tool-changes-2026-07-01"

      • "compact-2026-01-12"

      • "computer-use-2025-11-24"

      • "mcp-tunnels-2026-06-22"

      • "structured-outputs-2025-11-13"

      • "task-budgets-2026-03-13"

      • "thinking-display-updates-2026-08-18"

      • "ce-user-management-2026-07-13"

      • "mid-conversation-output-config-2026-07-01"

      • "thinking-binding-controls-2026-08-01"

      • "mid-conversation-system-clear-at-2026-08-21"

      • "compact-2026-09-04"

  • "anthropic-workspace-id": optional string

# Returns

  • data: array of BetaMessageBatch

    • type: "message_batch"

      Object type.

      For Message Batches, this is always "message_batch".

      default: message_batch

    • id: string

      Unique object identifier.

      The format and length of IDs may change over time.

    • archived_at: string or null

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

      format: date-time

    • cancel_initiated_at: string or null

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

      format: date-time

    • created_at: string

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

      format: date-time

    • ended_at: string or null

      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.

      format: date-time

    • expires_at: string

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

      format: date-time

    • processing_status: "in_progress" or "canceling" or "ended"

      Processing status of the Message Batch.

      • "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: number

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

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

        default: 0

      • errored: number

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

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

        default: 0

      • expired: number

        Number of requests in the Message Batch that have expired.

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

        default: 0

      • processing: number

        Number of requests in the Message Batch that are processing.

        default: 0

      • succeeded: number

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

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

        default: 0

    • results_url: string or null

      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.

  • first_id: string or null

    First ID in the data list. Can be used as the before_id for the previous page.

  • has_more: boolean

    Indicates if there are more results in the requested page direction.

  • last_id: string or null

    Last ID in the data list. Can be used as the after_id for the next page.

# Example

bash
curl https://api.anthropic.com/v1/messages/batches \
    -H 'anthropic-version: 2023-06-01' \
    -H 'anthropic-beta: message-batches-2024-09-24' \
    -H "X-Api-Key: $ANTHROPIC_API_KEY"

# Response (200)

json
{
  "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"
}
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