---
title: "Changes to Get chat messages"
method: GET
path: "/chat/completions/{completion_id}/messages"
---

# Changes to Get chat messages

`GET /chat/completions/{completion_id}/messages`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 10 of 397 revisions.

- **2026-10-06** `e2f8d8cbc41f`: 4 info
- **2026-09-28** `5b1e707ca2f9`: 3 breaking, 6 info
- **2026-09-28** `baee5b6ef947`: 3 breaking, 1 info
- **2026-09-25** `8166b0205067`: 4 info
- **2026-08-05** `ab0c5306e390`: 2 info
- **2026-07-15** `4065aec90c5d`: 2 info
- **2026-07-09** `e0508a503b84`: 2 info
- **2026-05-13** `74cbcf73838f`: 12 breaking, 3 info
- **2026-04-10** `7c540cce6eb3`: 11 breaking, 4 info
- **2025-03-11** `6ab43fe7798e`: 1 info

## Changes

- **2026-10-06** `e2f8d8cbc41f`: 4 info
  - added the optional property `error/misalignment/review_target` to the response with the `400` status
  - added the optional property `error/misalignment/review_target` to the response with the `404` status
  - added the optional property `error/misalignment/review_target` to the response with the `429` status
  - added the optional property `error/misalignment/review_target` to the response with the `500` status
- **2026-09-28** `5b1e707ca2f9`: 3 breaking, 6 info
  - the response property `first_id` became nullable for the status `200`
  - the response property `last_id` became nullable for the status `200`
  - the `data/items/` response's property type changed from no type to `object` for status `200`
  - added the optional property `data/items/name` to the response with the `200` status
  - removed `#/components/schemas/ChatCompletionResponseMessage, subschema #2` from the `data/items/` response property `allOf` list for the response status `200`
  - added the required property `data/items/content` to the response with the `200` status
  - added the required property `data/items/content_parts` to the response with the `200` status
  - added the required property `data/items/id` to the response with the `200` status
  - added the required property `data/items/role` to the response with the `200` status
- **2026-09-28** `baee5b6ef947`: 3 breaking, 1 info
  - the response property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/function_call` became nullable for the status `200`
  - the response property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/refusal` became optional for the status `200`
  - the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls` response's property type changed from `array` to no type for status `200`
  - added `#/components/schemas/ChatCompletionMessageToolCalls, subschema #2` to the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls` response property `anyOf` list for the response status `200`
- **2026-09-25** `8166b0205067`: 4 info
  - added the non-success response with the status `400`
  - added the non-success response with the status `404`
  - added the non-success response with the status `429`
  - added the non-success response with the status `500`
- **2026-08-05** `ab0c5306e390`: 2 info
  - added the optional property `data/items/allOf[subschema #2]/content_parts/anyOf[subschema #1]/items/oneOf[subschema #1: Text content part]/prompt_cache_breakpoint` to the response with the `200` status
  - added the optional property `data/items/allOf[subschema #2]/content_parts/anyOf[subschema #1]/items/oneOf[subschema #2: Image content part]/prompt_cache_breakpoint` to the response with the `200` status
- **2026-07-15** `4065aec90c5d`: 2 info
  - added the optional property `data/items/allOf[subschema #2]/content_parts/anyOf[subschema #1]/items/oneOf[subschema #1: Text content part]/prompt_cache_breakpoint` to the response with the `200` status
  - added the optional property `data/items/allOf[subschema #2]/content_parts/anyOf[subschema #1]/items/oneOf[subschema #2: Image content part]/prompt_cache_breakpoint` to the response with the `200` status
- **2026-07-09** `e0508a503b84`: 2 info
  - added the optional property `data/items/allOf[subschema #2]/content_parts/anyOf[subschema #1]/items/anyOf[subschema #1: Text content part]/prompt_cache_breakpoint` to the response with the `200` status
  - added the optional property `data/items/allOf[subschema #2]/content_parts/anyOf[subschema #1]/items/anyOf[subschema #2: Image content part]/prompt_cache_breakpoint` to the response with the `200` status
- **2026-05-13** `74cbcf73838f`: 12 breaking, 3 info
  - response property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/content` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - response property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/refusal` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - added `#/components/schemas/ChatCompletionMessageToolCall, #/components/schemas/ChatCompletionMessageCustomToolCall` to the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/` response property `oneOf` list for the response status `200`
  - the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio` response's property type changed from `object` to no type for status `200`
  - the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/` response's property type changed from `object` to no type for status `200`
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio/data` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio/expires_at` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio/id` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio/transcript` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/function` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/id` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/type` from the response with the `200` status
  - added the optional property `data/items/allOf[subschema #2]/content_parts` to the response with the `200` status
  - added `subschema #1, subschema #2` to the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio` response property `anyOf` list for the response status `200`
  - added discriminator to `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/` response property for the response status `200`
- **2026-04-10** `7c540cce6eb3`: 11 breaking, 4 info
  - response property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/content` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - response property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/refusal` list-of-types was widened by adding types `null` to media type `application/json` of response `200`
  - the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio` response's property type changed from `object` to no type for status `200`
  - the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/` response's property type changed from `object` to no type for status `200`
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio/data` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio/expires_at` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio/id` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio/transcript` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/function` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/id` from the response with the `200` status
  - removed the required property `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/type` from the response with the `200` status
  - added the optional property `data/items/allOf[subschema #2]/content_parts` to the response with the `200` status
  - added `#/components/schemas/ChatCompletionMessageToolCall, #/components/schemas/ChatCompletionMessageCustomToolCall` to the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/` response property `anyOf` list for the response status `200`
  - added `subschema #1, subschema #2` to the `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/audio` response property `anyOf` list for the response status `200`
  - added discriminator to `data/items/allOf[#/components/schemas/ChatCompletionResponseMessage]/tool_calls/items/` response property for the response status `200`
- **2025-03-11** `6ab43fe7798e`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/openai/apis/openapi/docs/chat/completions/:completion_id/messages/get.md) - [API](https://skmtc.dev/openai/apis/openapi.md) - [Page](https://skmtc.dev/openai/apis/openapi/changes/chat/completions/:completion_id/messages/get)