---
title: "Changes to Modify message"
method: POST
path: "/threads/{thread_id}/messages/{message_id}"
---

# Changes to Modify message

`POST /threads/{thread_id}/messages/{message_id}`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 4 of 163 revisions.

- **2026-09-03** `9430b00d75b4` — 1 info
- **2026-08-14** `6ac2618eefd7` — 1 info
- **2026-05-13** `74cbcf73838f` — 9 breaking, 2 info
- **2024-08-06** `8eca3b09b705` — 1 breaking

## Changes

- **2026-09-03** `9430b00d75b4` — 1 info
  - added the optional property `error/misalignment` to the response with the `429` status
- **2026-08-14** `6ac2618eefd7` — 1 info
  - added the non-success response with the status `429`
- **2026-05-13** `74cbcf73838f` — 9 breaking, 2 info
  - the request property `metadata` became not nullable
  - response property `assistant_id` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - response property `attachments` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - response property `completed_at` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - response property `incomplete_at` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - response property `metadata` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - response property `run_id` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - the `incomplete_details` response's property type changed from `object` to no type for status `200`
  - removed the required property `incomplete_details/reason` from the response with the `200` status
  - request property `metadata` list-of-types was widened by adding types `null` to media type `application/json`
  - added `subschema #1, subschema #2` to the `incomplete_details` response property `anyOf` list for the response status `200`
- **2024-08-06** `8eca3b09b705` — 1 breaking
  - added `#/components/schemas/MessageContentRefusalObject` to the `content/items/` response property `oneOf` list for the response status `200`

---

[Operation](https://skmtc.dev/openai/apis/openapi/docs/threads/:thread_id/messages/:message_id/post.md) · [API](https://skmtc.dev/openai/apis/openapi.md) · [Page](https://skmtc.dev/openai/apis/openapi/changes/threads/:thread_id/messages/:message_id/post)