---
title: "Stop Training Job"
method: POST
path: "/felix/training-jobs/{job_id}/stop"
tags: ["felix"]
---

# Stop Training Job

`POST /felix/training-jobs/{job_id}/stop`

Stop a running training job.

## Path parameters

- `job_id` string, required

## Request body

- StopJobRequest — Optional prune evidence recorded when stopping a training job.
  - `reason` string, nullable — Why this candidate is being stopped
  - `scores` object, nullable — Metric values used to decide the prune
  - `checkpoint` string, nullable — Checkpoint path or step associated with this stop

## Response `200`

Successful Response

- StopJobResponse — Response after stopping a training job
  - `success` boolean, required
  - `message` string, required
  - `job_id` string, required
  - `status` string, required

## Other responses

- `422` — Validation Error

## Changes

- **2026-09-24** `1cffaad2a921` — 1 warning, 2 info
  - removed the optional property `detail` from the response with the `422` status
  - added optional request body
  - added the required property `error` to the response with the `422` status

[Change history](https://skmtc.dev/pioneer/apis/brain-api/changes/felix/training-jobs/:job_id/stop/post.md)

---

[API](https://skmtc.dev/pioneer/apis/brain-api.md) · [All operations](https://skmtc.dev/pioneer/apis/brain-api/llms.txt) · [OpenAPI document](https://skmtc.dev/pioneer/apis/brain-api/revisions/1cffaad2a921?raw)