---
title: "Changes to Speech to speech"
method: POST
path: "/v1/speech_to_speech"
---

# Changes to Speech to speech

`POST /v1/speech_to_speech`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 10 of 54 revisions.

- **2026-08-07** `73a12c23285c` — 2 info
- **2026-05-08** `c9dc9ce1282a` — 1 warning
- **2026-04-30** `1d3bb312672a` — 1 info
- **2026-04-15** `87bdf413b984` — 1 warning
- **2026-04-15** `6f5bc53a0d36` — 1 info
- **2025-12-04** `6dab1bdab5d3` — 5 info
- **2025-12-03** `c2a88516fa0c` — 4 info
- **2025-12-03** `76b3962cf49e` — 4 info
- **2025-11-04** `6902fa9494c5` — 2 breaking, 3 info
- **2025-10-22** `8448e1c9a862` — 1 info

## Changes

- **2026-08-07** `73a12c23285c` — 2 info
  - added the non-success response with the status `400`
  - added the required property `estimatedCost` to the response with the `200` status
- **2026-05-08** `c9dc9ce1282a` — 1 warning
  - removed the request property `oneOf[subschema #1: eleven_multilingual_sts_v2]/runwayVoiceId`
- **2026-04-30** `1d3bb312672a` — 1 info
  - added the new optional request property `oneOf[subschema #1: eleven_multilingual_sts_v2]/runwayVoiceId`
- **2026-04-15** `87bdf413b984` — 1 warning
  - removed the request property `oneOf[subschema #1: eleven_multilingual_sts_v2]/runwayVoiceId`
- **2026-04-15** `6f5bc53a0d36` — 1 info
  - added the new optional request property `oneOf[subschema #1: eleven_multilingual_sts_v2]/runwayVoiceId`
- **2025-12-04** `6dab1bdab5d3` — 5 info
  - the `model` request property default value `eleven_multilingual_sts_v2` was removed
  - the `type` request property default value `audio` was removed
  - the `type` request property default value `runway-preset` was removed
  - the `type` request property default value `video` was removed
  - added the media type `application/json` for the response with the status `429`
- **2025-12-03** `c2a88516fa0c` — 4 info
  - the `model` request property default value `eleven_multilingual_sts_v2` was added
  - the `type` request property default value `audio` was added
  - the `type` request property default value `runway-preset` was added
  - the `type` request property default value `video` was added
- **2025-12-03** `76b3962cf49e` — 4 info
  - the `model` request property default value `eleven_multilingual_sts_v2` was removed
  - the `type` request property default value `audio` was removed
  - the `type` request property default value `runway-preset` was removed
  - the `type` request property default value `video` was removed
- **2025-11-04** `6902fa9494c5` — 2 breaking, 3 info
  - removed `subschema #1` from the `oneOf[subschema #1: eleven_multilingual_sts_v2]/voice` request property `oneOf` list
  - removed `subschema #1, subschema #2` from the `oneOf[subschema #1: eleven_multilingual_sts_v2]/media` request property `oneOf` list
  - the `model` request property default value `eleven_multilingual_sts_v2` was added
  - added `subschema #1: RunwayPresetVoice` to the `oneOf[subschema #1: eleven_multilingual_sts_v2]/voice` request property `oneOf` list
  - added `subschema #1: SpeechToSpeechAudio, subschema #2: SpeechToSpeechVideo` to the `oneOf[subschema #1: eleven_multilingual_sts_v2]/media` request property `oneOf` list
- **2025-10-22** `8448e1c9a862` — 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/runwayml/apis/runwayml-api/docs/v1/speech_to_speech/post.md) · [API](https://skmtc.dev/runwayml/apis/runwayml-api.md) · [Page](https://skmtc.dev/runwayml/apis/runwayml-api/changes/v1/speech_to_speech/post)