curl -X POST 'https://api.anthropic.com/v1/messages/batches/message-batch-id/cancel' \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H 'anthropic-version: 2023-06-01'

# POST /v1/messages/batches/{message_batch_id}/cancel (Claude API)
Base URL: https://api.anthropic.com
Auth: x-api-key; Anthropic API key; required.
Last verified: 2026-10-20

> Cancel a Message Batch

## Critical Gotchas
* Authentication uses the `x-api-key` header and requests also require an `anthropic-version` header.
* The official OpenAPI URL is discovered from the SDK repository manifest and must remain under Anthropic's trusted Stainless storage prefix.

## cURL
curl -X POST 'https://api.anthropic.com/v1/messages/batches/message-batch-id/cancel' \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H 'anthropic-version: 2023-06-01'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| message_batch_id | path | string | Yes | ID of the Message Batch. |

## Response example
{"archived_at":"2026-09-03T00:00:00Z","cancel_initiated_at":"2026-09-03T00:00:00Z"}

---
Need an API key? Get one at https://console.anthropic.com/settings/keys

POST

POST /v1/messages/batches/{message_batch_id}/cancel — Claude API

Anthropic API key (required); https://api.anthropic.com

Claude API

Cancel a Message Batch

Base URL: https://api.anthropic.com
Auth: x-api-key: <ANTHROPIC_API_KEY>
Last verified: 2026-10-20 · upstream hash matched

Actions Try in browser→

Agents: curl -H "Accept: text/markdown" this URL
→ 163 tokens · Vary: Accept

Critical gotchas

Authentication uses the x-api-key header and requests also require an anthropic-version header.

The official OpenAPI URL is discovered from the SDK repository manifest and must remain under Anthropic's trusted Stainless storage prefix.

cURL

curl -X POST 'https://api.anthropic.com/v1/messages/batches/message-batch-id/cancel' \  -H "x-api-key: $ANTHROPIC_API_KEY" \  -H 'anthropic-version: 2023-06-01'

Parameters

Name	In	Type	Required	Description
message_batch_id	path	string	Yes	ID of the Message Batch.

Response 200 OK

{
  "archived_at": "2026-09-03T00:00:00Z",
  "cancel_initiated_at": "2026-09-03T00:00:00Z",
  "created_at": "2026-09-03T00:00:00Z",
  "ended_at": "2026-09-03T00:00:00Z",
  "expires_at": "2026-09-03T00:00:00Z",
  "id": "string",
  "processing_status": "in_progress",
  "request_counts": {
    "canceled": 0,
    "errored": 0,
    "expired": 0,
    "processing": 0,
    "succeeded": 0
  },
  "results_url": "string",
  "type": "message_batch"
}

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