---
title: "Changes to Create a chat completion (OpenAI-compatible)"
method: POST
path: "/ai/openai/chat/completions"
---

# Changes to Create a chat completion (OpenAI-compatible)

`POST /ai/openai/chat/completions`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 2 of 89 revisions.

- **2026-10-15** `a72569d69430`: 1 breaking, 4 warning, 7 info
- **2026-05-08** `30cb1ddce91b`: 1 info

## Changes

- **2026-10-15** `a72569d69430`: 1 breaking, 4 warning, 7 info
  - the `response_format` request property type changed from `object` to no type
  - removed the request property `guided_choice`
  - removed the request property `guided_json`
  - removed the request property `guided_regex`
  - removed the request property `response_format/type`
  - added the new optional request property `mode`
  - added the new optional request property `reasoning_effort`
  - added the new optional request property `region`
  - added the new optional request property `service_tier`
  - the request property `max_tokens` became nullable
  - removed discriminator from `tools/items/` request property
  - added `#/components/schemas/ResponseFormatText, #/components/schemas/ResponseFormatJsonObject, #/components/schemas/ResponseFormatJsonSchemaParam` to the `response_format` request property `oneOf` list
- **2026-05-08** `30cb1ddce91b`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/team-telnyx/apis/telnyx-api/docs/ai/openai/chat/completions/post.md) - [API](https://skmtc.dev/team-telnyx/apis/telnyx-api.md) - [Page](https://skmtc.dev/team-telnyx/apis/telnyx-api/changes/ai/openai/chat/completions/post)