curl -X POST 'https://api.openai.com/v1/threads/thread-id/runs/run-id/cancel' \
  -H "Authorization: Bearer $OPENAI_API_KEY"

# POST /threads/{thread_id}/runs/{run_id}/cancel (OpenAI API)
Base URL: https://api.openai.com/v1
Auth: Authorization; OpenAI API key; required.
Last verified: 2026-10-20

> Cancel a run

## Critical Gotchas
* The Responses API is the primary interface for new text and tool workflows; Chat Completions remains a separate compatibility API.
* Audio transcription uploads use multipart form data rather than a JSON request body.

## cURL
curl -X POST 'https://api.openai.com/v1/threads/thread-id/runs/run-id/cancel' \
  -H "Authorization: Bearer $OPENAI_API_KEY"

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| thread_id | path | string | Yes | The ID of the thread to which this run belongs. |
| run_id | path | string | Yes | The ID of the run to cancel. |

## Response example
{"id":"string","object":"thread.run"}

---
Need an API key? Get one at https://platform.openai.com/api-keys

POST

POST /threads/{thread_id}/runs/{run_id}/cancel — OpenAI API

OpenAI API key (required); https://api.openai.com/v1

OpenAI API

Cancel a run

Base URL: https://api.openai.com/v1
Auth: Authorization: Bearer <OPENAI_API_KEY>
Last verified: 2026-10-20 · upstream hash matched

Actions Try in browser→

Agents: curl -H "Accept: text/markdown" this URL
→ 188 tokens · Vary: Accept

Critical gotchas

The Responses API is the primary interface for new text and tool workflows; Chat Completions remains a separate compatibility API.

Audio transcription uploads use multipart form data rather than a JSON request body.

cURL

curl -X POST 'https://api.openai.com/v1/threads/thread-id/runs/run-id/cancel' \  -H "Authorization: Bearer $OPENAI_API_KEY"

Parameters

Name	In	Type	Required	Description
thread_id	path	string	Yes	The ID of the thread to which this run belongs.
run_id	path	string	Yes	The ID of the run to cancel.

Response 200 OK

{
  "id": "string",
  "object": "thread.run",
  "created_at": 0,
  "thread_id": "string",
  "assistant_id": "string",
  "status": "queued",
  "required_action": {
    "type": "submit_tool_outputs",
    "submit_tool_outputs": {
      "tool_calls": [
        {
          "id": "string",
          "type": "function",
          "function": {
            "name": "[recursive or deeply nested schema]",
            "arguments": "[recursive or deeply nested schema]"
          }
        }
      ]
    }
  },
  "last_error": {
    "code": "server_error",
    "message": "string"
  },
  "expires_at": 0,
  "started_at": 0,
  "cancelled_at": 0,
  "failed_at": 0,
  "completed_at": 0,
  "incomplete_details": {
    "reason": "max_completion_tokens"
  },
  "model": "string",
  "instructions": "string",
  "tools": [],
  "metadata": {},
  "usage": {
    "completion_tokens": 0,
    "prompt_tokens": 0,
    "total_tokens": 0
  },
  "temperature": 0,
  "top_p": 0,
  "max_prompt_tokens": 0,
  "max_completion_tokens": 0,
  "truncation_strategy": {
    "type": "auto",
    "last_messages": 0
  },
  "tool_choice": "none",
  "parallel_tool_calls": true,
  "response_format": "auto"
}

Get a free OpenAI API key → sponsored

Affiliate link - we may earn a commission, at no extra cost to you.