---
title: "Changes to Create Speech Engine"
method: POST
path: "/v1/speech-engine"
---

# Changes to Create Speech Engine

`POST /v1/speech-engine`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 16 of 108 revisions.

- **2026-10-23** `47dc9e66d680`: 2 warning
- **2026-10-15** `260e07ca1d41`: 1 breaking, 1 warning
- **2026-10-11** `775d1f02f1a7`: 2 info
- **2026-10-09** `0c930e56e185`: 2 info
- **2026-10-03** `204453a63fdc`: 2 info
- **2026-10-01** `d942e69ff7a7`: 1 warning, 3 info
- **2026-09-30** `b3fe16f8d37a`: 4 warning, 4 info
- **2026-09-15** `b054999f0d0f`: 2 info
- **2026-09-01** `70aad41bc4b9`: 2 info
- **2026-08-27** `f366bca2ae3c`: 2 info
- **2026-08-19** `4bbf59c13c42`: 2 warning, 2 info
- **2026-08-12** `7508b542a4bd`: 2 info
- **2026-08-11** `d1a4847203ce`: 4 info
- **2026-07-31** `72c54eba117e`: 2 warning, 4 info
- **2026-07-13** `009bd651509a`: 14 info
- **2026-06-08** `37fac3c5a2d7`: 1 info

## Changes

- **2026-10-23** `47dc9e66d680`: 2 warning
  - added the new `architect` enum value to the `metadata/created_from` response property for the response status `201`
  - added the new `architect` enum value to the `metadata/last_updated_from` response property for the response status `201`
- **2026-10-15** `260e07ca1d41`: 1 breaking, 1 warning
  - removed the required property `tts/audio_effects/anyOf[subschema #1: EffectsSpec]/seed` from the response with the `201` status
  - removed the request property `tts/audio_effects/anyOf[subschema #1: EffectsSpec]/seed`
- **2026-10-11** `775d1f02f1a7`: 2 info
  - added the new optional request property `tts/audio_effects/anyOf[subschema #1: EffectsSpec]/pan`
  - added the required property `tts/audio_effects/anyOf[subschema #1: EffectsSpec]/pan` to the response with the `201` status
- **2026-10-09** `0c930e56e185`: 2 info
  - request property `tts/audio_effects/anyOf[subschema #1: EffectsSpec]/seed` deprecated
  - response property `tts/audio_effects/anyOf[subschema #1: EffectsSpec]/seed` deprecated
- **2026-10-03** `204453a63fdc`: 2 info
  - added the new optional request property `privacy/conversation_history_redaction/excluded_data_collection_ids`
  - added the optional property `privacy/conversation_history_redaction/excluded_data_collection_ids` to the response with the `201` status
- **2026-10-01** `d942e69ff7a7`: 1 warning, 3 info
  - added the new `scribe_v2_turbo` enum value to the `asr/provider` response property for the response status `201`
  - the `model_id` request property default value changed from `eleven_flash_v2` to `eleven_v4_turbo`
  - added the new `scribe_v2_turbo` enum value to the request property `asr/provider`
  - the `model_id` response's property default value changed from `eleven_flash_v2` to `eleven_v4_turbo` for the status `201`
- **2026-09-30** `b3fe16f8d37a`: 4 warning, 4 info
  - added the new `eleven_v4` enum value to the `tts/model_id` response property for the response status `201`
  - added the new `eleven_v4_turbo` enum value to the `tts/model_id` response property for the response status `201`
  - added the new `v4` enum value to the `tts/supported_voices/items/model_family/anyOf[subschema #1: TTSModelFamily]/` response property for the response status `201`
  - added the new `v4_turbo` enum value to the `tts/supported_voices/items/model_family/anyOf[subschema #1: TTSModelFamily]/` response property for the response status `201`
  - added the new `eleven_v4` enum value to the request property `tts/model_id`
  - added the new `eleven_v4_turbo` enum value to the request property `tts/model_id`
  - added the new `v4` enum value to the request property `tts/supported_voices/items/model_family/anyOf[subschema #1: TTSModelFamily]/`
  - added the new `v4_turbo` enum value to the request property `tts/supported_voices/items/model_family/anyOf[subschema #1: TTSModelFamily]/`
- **2026-09-15** `b054999f0d0f`: 2 info
  - added the new optional request property `cascade_timeout_seconds`
  - added the required property `cascade_timeout_seconds` to the response with the `201` status
- **2026-09-01** `70aad41bc4b9`: 2 info
  - added the new optional request property `tts/audio_effects`
  - added the optional property `tts/audio_effects` to the response with the `201` status
- **2026-08-27** `f366bca2ae3c`: 2 info
  - added the new optional request property `conversation/dtmf_input_settings`
  - added the optional property `conversation/dtmf_input_settings` to the response with the `201` status
- **2026-08-19** `4bbf59c13c42`: 2 warning, 2 info
  - added the new `context_usage` enum value to the `conversation/client_events/items/` response property for the response status `201`
  - added the new `context_usage` enum value to the `conversation/monitoring_events/items/` response property for the response status `201`
  - added the new `context_usage` enum value to the request property `conversation/client_events/items/`
  - added the new `context_usage` enum value to the request property `conversation/monitoring_events/items/`
- **2026-08-12** `7508b542a4bd`: 2 info
  - added the new optional request property `turn/merge_with_default_ignore_terms`
  - added the optional property `turn/merge_with_default_ignore_terms` to the response with the `201` status
- **2026-08-11** `d1a4847203ce`: 4 info
  - the `crossfade_loop` request property default value changed from `false` to `true`
  - the `volume` request property default value changed from `0.6` to `0.15`
  - the `crossfade_loop` response's property default value changed from `false` to `true` for the status `201`
  - the `volume` response's property default value changed from `0.6` to `0.15` for the status `201`
- **2026-07-31** `72c54eba117e`: 2 warning, 4 info
  - removed the request property `tts/audio_filter`
  - removed the optional property `tts/audio_filter` from the response with the `201` status
  - added the new optional request property `conversation/file_input/max_files_in_memory`
  - added the new optional request property `vad`
  - added the optional property `conversation/file_input/max_files_in_memory` to the response with the `201` status
  - added the required property `vad` to the response with the `201` status
- **2026-07-13** `009bd651509a`: 14 info
  - added the new optional request property `conversation/background_sound`
  - added the new optional request property `tts/audio_filter`
  - added the new optional request property `tts/enable_phoneme_tags`
  - added the new optional request property `turn/interruption_ignore_term_languages`
  - added the new optional request property `turn/interruption_ignore_terms`
  - added the new optional request property `turn/transcribe_on_disabled_interruptions`
  - request property `tts/optimize_streaming_latency` deprecated
  - added the optional property `conversation/background_sound` to the response with the `201` status
  - added the optional property `tts/audio_filter` to the response with the `201` status
  - added the optional property `tts/enable_phoneme_tags` to the response with the `201` status
  - added the optional property `turn/interruption_ignore_term_languages` to the response with the `201` status
  - added the optional property `turn/interruption_ignore_terms` to the response with the `201` status
  - added the optional property `turn/transcribe_on_disabled_interruptions` to the response with the `201` status
  - response property `tts/optimize_streaming_latency` deprecated
- **2026-06-08** `37fac3c5a2d7`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation/docs/v1/speech-engine/post.md) - [API](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation.md) - [Page](https://skmtc.dev/elevenlabs/apis/elevenlabs-api-documentation/changes/v1/speech-engine/post)