> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fastino.ai/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Use https://docs.fastino.ai/llms.txt to discover and navigate pages. Use https://docs.fastino.ai/llms-full.txt when you need the complete documentation corpus. Use https://docs.fastino.ai/openapi.json as the source of truth for customer-facing routes. For GLiDE decision inference, call POST https://api.fastino.ai/v1/systemone with model fastino/GLiDE. Do not infer undocumented routes. Read API keys from FASTINO_API_KEY and never embed credentials in code, logs, or reports.

# List training-run checkpoints

> Call GET /v1/training/jobs/{job_id}/checkpoints to list a training run's saved training-state and sampler checkpoints, newest first, with their sizes.

`GET /v1/training/jobs/{job_id}/checkpoints`

Returns the saved checkpoints of a training run, newest first. Checkpoints are created by the SDK's save calls: training-state checkpoints (`weights/<name>`) can resume training, and sampler checkpoints (`sampler_weights/<name>`) hold the adapter weights used for sampling.

## Request

<ParamField header="X-API-Key" type="string" required>
  Your Fastino API key.
</ParamField>

<ParamField path="job_id" type="string" required>
  Training-run ID.
</ParamField>

<RequestExample>
  ```bash cURL theme={null}
  curl https://api.fastino.ai/v1/training/jobs/YOUR_JOB_ID/checkpoints \
    -H "X-API-Key: $FASTINO_API_KEY"
  ```
</RequestExample>

## Response

<ResponseField name="success" type="boolean">
  Whether the request succeeded.
</ResponseField>

<ResponseField name="run_id" type="string">
  Training-run ID.
</ResponseField>

<ResponseField name="checkpoints" type="object[]">
  Saved checkpoints, newest first.

  <Expandable title="checkpoint">
    <ResponseField name="checkpoint_id" type="string">
      Checkpoint ID, either `weights/<name>` or `sampler_weights/<name>`. Use it with [Download a checkpoint](/api-reference/training-runs/download-checkpoint).
    </ResponseField>

    <ResponseField name="checkpoint_type" type="string">
      `training` for training-state checkpoints or `sampler` for sampler weights.
    </ResponseField>

    <ResponseField name="time" type="string">
      ISO 8601 timestamp when the checkpoint was saved.
    </ResponseField>

    <ResponseField name="tinker_path" type="string">
      The checkpoint's `tinker://` path, which the SDK uses to load it.
    </ResponseField>

    <ResponseField name="size_bytes" type="integer | null">
      Checkpoint size in bytes, when known.
    </ResponseField>

    <ResponseField name="public" type="boolean">
      Whether the checkpoint is published.
    </ResponseField>

    <ResponseField name="user_metadata" type="object | null">
      String key-value metadata attached to the checkpoint.
    </ResponseField>

    <ResponseField name="expires_at" type="string | null">
      ISO 8601 expiry time, or `null` when the checkpoint is kept until deleted.
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseField name="count" type="integer">
  Number of checkpoints returned.
</ResponseField>

<ResponseExample>
  ```json Response theme={null}
  {
    "success": true,
    "run_id": "YOUR_SESSION_ID:train:0",
    "checkpoints": [
      {
        "checkpoint_id": "sampler_weights/step-100",
        "checkpoint_type": "sampler",
        "time": "2026-10-09T18:40:02Z",
        "tinker_path": "tinker://YOUR_SESSION_ID:train:0/sampler_weights/step-100",
        "size_bytes": 167772160,
        "public": false,
        "user_metadata": null,
        "expires_at": null
      },
      {
        "checkpoint_id": "weights/step-100",
        "checkpoint_type": "training",
        "time": "2026-10-09T18:40:00Z",
        "tinker_path": "tinker://YOUR_SESSION_ID:train:0/weights/step-100",
        "size_bytes": 503316480,
        "public": false,
        "user_metadata": null,
        "expires_at": null
      }
    ],
    "count": 2
  }
  ```
</ResponseExample>

An unknown run, or a run you cannot see, returns `404`.


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