curl -X GET 'https://api.openai.com/v1/fine_tuning/jobs/ft-AF1WoRqd3aJAHsqc9NY7iL8F/checkpoints?after=example-after&limit=10' \
  -H "Authorization: Bearer $OPENAI_API_KEY"

# GET /fine_tuning/jobs/{fine_tuning_job_id}/checkpoints (OpenAI API)
Base URL: https://api.openai.com/v1
Auth: Authorization; OpenAI API key; required.
Last verified: 2026-10-20

> List fine-tuning checkpoints

## 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 GET 'https://api.openai.com/v1/fine_tuning/jobs/ft-AF1WoRqd3aJAHsqc9NY7iL8F/checkpoints?after=example-after&limit=10' \
  -H "Authorization: Bearer $OPENAI_API_KEY"

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| fine_tuning_job_id | path | string | Yes | The ID of the fine-tuning job to get checkpoints for.  |
| after | query | string | No | Identifier for the last checkpoint ID from the previous pagination request. |
| limit | query | integer | No | Number of checkpoints to retrieve. |

## Response example
{"data":[{}],"object":"list"}

---
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GET

GET /fine_tuning/jobs/{fine_tuning_job_id}/checkpoints — OpenAI API

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

OpenAI API

List fine-tuning checkpoints

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
→ 212 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 GET 'https://api.openai.com/v1/fine_tuning/jobs/ft-AF1WoRqd3aJAHsqc9NY7iL8F/checkpoints?after=example-after&limit=10' \  -H "Authorization: Bearer $OPENAI_API_KEY"

Parameters

Name	In	Type	Required	Description
fine_tuning_job_id	path	string	Yes	The ID of the fine-tuning job to get checkpoints for.
after	query	string	No	Identifier for the last checkpoint ID from the previous pagination request.
limit	query	integer	No	Number of checkpoints to retrieve.

Response 200 OK

{
  "data": [
    {
      "id": "string",
      "created_at": 0,
      "fine_tuned_model_checkpoint": "string",
      "step_number": 0,
      "metrics": {
        "step": 0,
        "train_loss": 0,
        "train_mean_token_accuracy": 0,
        "valid_loss": 0,
        "valid_mean_token_accuracy": 0,
        "full_valid_loss": 0,
        "full_valid_mean_token_accuracy": 0
      },
      "fine_tuning_job_id": "string",
      "object": "fine_tuning.job.checkpoint"
    }
  ],
  "object": "list",
  "first_id": "string",
  "last_id": "string",
  "has_more": true
}

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