---
title: "Cancel an active chat completion"
method: POST
path: "/v1/cancel/{completion_id}"
tags: ["Chat"]
---

# Cancel an active chat completion

`POST /v1/cancel/{completion_id}`

Cancels an actively executing chat completion by terminating the subprocess and rolling back session state.

## Path parameters

- `completion_id` string, required

## Response `200`

The chat completion was cancelled successfully

- ChatCompletionCancelled — Represents the cancellation confirmation of an active chat completion.
  - `id` string, required — The ID of the cancelled chat completion.
  - `object` 'chat.completion.cancelled', required — The object type, which is always "chat.completion.cancelled".
  - `cancelled` boolean, required — Whether the chat completion was successfully cancelled.
  - `message` string — Additional information about the cancellation.

## Other responses

- `400` — No active event to cancel
- `404` — The chat completion with the specified ID was not found

---

[API](https://skmtc.net/qualcomm/apis/llm-vlm-genai-microservice-apis.md) · [All operations](https://skmtc.net/qualcomm/apis/llm-vlm-genai-microservice-apis/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/qualcomm/llm-vlm-genai-microservice-apis/revisions/8557fe985a5e/schema)