---
title: "Changes to Compare a run against a baseline"
method: GET
path: "/projects/{projectId}/eval-runs/{runId}/compare"
---

# Changes to Compare a run against a baseline

`GET /projects/{projectId}/eval-runs/{runId}/compare`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 8 of 138 revisions.

- **2026-09-14** `56b9d1dda7ea`: 1 info
- **2026-09-14** `3ae6331c1446`: 2 warning, 2 info
- **2026-09-12** `de57cfcdd824`: 1 info
- **2026-09-07** `417b6d81e434`: 2 info
- **2026-08-27** `6898f438c65e`: 1 info
- **2026-08-25** `31c2408136d8`: 1 warning, 4 info
- **2026-08-22** `de73fc9b1118`: 1 warning, 6 info
- **2026-08-15** `7d1aff84ce3b`: 1 info

## Changes

- **2026-09-14** `56b9d1dda7ea`: 1 info
  - added the new optional `header` request parameter `x-mcpjam-eval-vocabulary`
- **2026-09-14** `3ae6331c1446`: 2 warning, 2 info
  - added the new `case` enum value to the `baseRun/modelSource` response property for the response status `200`
  - added the new `case` enum value to the `compareRun/modelSource` response property for the response status `200`
  - added the optional property `baseRun/client` to the response with the `200` status
  - added the optional property `compareRun/client` to the response with the `200` status
- **2026-09-12** `de57cfcdd824`: 1 info
  - added the non-success response with the status `502`
- **2026-09-07** `417b6d81e434`: 2 info
  - added the optional property `cases/items/metrics` to the response with the `200` status
  - added the optional property `metrics/costCoverage` to the response with the `200` status
- **2026-08-27** `6898f438c65e`: 1 info
  - added the optional property `skills` to the response with the `200` status
- **2026-08-25** `31c2408136d8`: 1 warning, 4 info
  - added the new `commit_sha` enum value to the `baseline/policy` response property for the response status `200`
  - added the new optional `query` request parameter `baseCommitSha`
  - added the optional property `baseline/baseCommitSha` to the response with the `200` status
  - added the optional property `baseline/matchCount` to the response with the `200` status
  - added the optional property `baseline/matchCountTruncated` to the response with the `200` status
- **2026-08-22** `de73fc9b1118`: 1 warning, 6 info
  - added the new `previous_completed_same_environment` enum value to the `baseline/policy` response property for the response status `200`
  - added the optional property `baseRun/effectiveModelId` to the response with the `200` status
  - added the optional property `baseRun/environment` to the response with the `200` status
  - added the optional property `baseRun/modelSource` to the response with the `200` status
  - added the optional property `compareRun/effectiveModelId` to the response with the `200` status
  - added the optional property `compareRun/environment` to the response with the `200` status
  - added the optional property `compareRun/modelSource` to the response with the `200` status
- **2026-08-15** `7d1aff84ce3b`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/mcpjam/apis/mcpjam-api/docs/projects/:projectId/eval-runs/:runId/compare/get.md) - [API](https://skmtc.dev/mcpjam/apis/mcpjam-api.md) - [Page](https://skmtc.dev/mcpjam/apis/mcpjam-api/changes/projects/:projectId/eval-runs/:runId/compare/get)