---
title: "Changes to Create chat completion"
method: POST
path: "/chat/completions"
---

# Changes to Create chat completion

`POST /chat/completions`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 2 of 15 revisions.

- **2026-08-13** `77b96702e4e3` — 4 info
- **2026-07-26** `0c4fdad77435` — 7 info

## Changes

- **2026-08-13** `77b96702e4e3` — 4 info
  - added the new optional request property `messages/items/oneOf[#/components/schemas/ChatCompletionAssistantMessageParam]/reasoning`
  - added the new optional request property `messages/items/oneOf[#/components/schemas/ChatCompletionAssistantMessageParam]/reasoning_content`
  - added the optional property `choices/items/message/reasoning_content` to the response with the `200` status (media type: application/json)
  - added the optional property `oneOf[#/components/schemas/ChatCompletionEvent]/data/choices/items/delta/reasoning_content` to the response with the `200` status (media type: text/event-stream)
- **2026-07-26** `0c4fdad77435` — 7 info
  - the `frequency_penalty` request property type/format was generalized from `number`/`float` to `number`/``
  - the `logit_bias/additionalProperties/` request property type/format was generalized from `number`/`float` to `number`/``
  - the `min_p` request property type/format was generalized from `number`/`float` to `number`/``
  - the `presence_penalty` request property type/format was generalized from `number`/`float` to `number`/``
  - the `temperature` request property type/format was generalized from `number`/`float` to `number`/``
  - the `top_k` request property type/format was generalized from `integer`/`int32` to `integer`/``
  - the `top_p` request property type/format was generalized from `number`/`float` to `number`/``

---

[Operation](https://skmtc.dev/together/apis/together-apis/docs/chat/completions/post.md) · [API](https://skmtc.dev/together/apis/together-apis.md) · [Page](https://skmtc.dev/together/apis/together-apis/changes/chat/completions/post)