---
title: "Changes to Create speech"
method: POST
path: "/audio/speech"
---

# Changes to Create speech

`POST /audio/speech`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 2 of 88 revisions.

- **2026-10-06** `487892d3954e`: 5 info
- **2026-10-05** `7f654af7f94f`: 7 breaking, 18 info

## Changes

- **2026-10-06** `487892d3954e`: 5 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 `401` 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
  - added the optional property `error/misalignment/review_target` to the response with the `503` status
- **2026-10-05** `7f654af7f94f`: 7 breaking, 18 info
  - removed the enum value `alloy` of the request property `voice`
  - removed the enum value `echo` of the request property `voice`
  - removed the enum value `fable` of the request property `voice`
  - removed the enum value `nova` of the request property `voice`
  - removed the enum value `onyx` of the request property `voice`
  - removed the enum value `shimmer` of the request property `voice`
  - the `voice` request property type changed from `string` to no type
  - added the new optional request property `instructions`
  - added the new optional request property `stream_format`
  - added `subschema #1, subschema #2` to the `voice` request property `anyOf` list
  - added the new `gpt-4o-mini-tts` enum value to the request property `model/anyOf[subschema #2]/`
  - added the new `gpt-4o-mini-tts-2025-12-15` enum value to the request property `model/anyOf[subschema #2]/`
  - added the media type `audio/aac` for the response with the status `200`
  - added the media type `audio/flac` for the response with the status `200`
  - added the media type `audio/mpeg` for the response with the status `200`
  - added the media type `audio/opus` for the response with the status `200`
  - added the media type `audio/pcm` for the response with the status `200`
  - added the media type `audio/wav` for the response with the status `200`
  - added the media type `text/event-stream` for the response with the status `200`
  - added the non-success response with the status `400`
  - added the non-success response with the status `401`
  - added the non-success response with the status `403`
  - added the non-success response with the status `429`
  - added the non-success response with the status `500`
  - added the non-success response with the status `503`

---

[Operation](https://skmtc.dev/omnistack-sh/apis/openai-api/docs/audio/speech/post.md) - [API](https://skmtc.dev/omnistack-sh/apis/openai-api.md) - [Page](https://skmtc.dev/omnistack-sh/apis/openai-api/changes/audio/speech/post)