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Starting June 1, 2026, we are discontinuing several models, snapshots, and languages, and removing voice embeddings from our voice API. Migrate to sonic-3 for improved naturalness, 42-language support, and fine-grained controls.

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Deprecated models and languages

You can check if you’re making requests to deprecated models on play.cartesia.ai/deprecation/traffic.

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Fully deprecated models

These models will stop serving requests on June 1, 2026.
ModelSnapshots affectedDeprecated languages
sonicAllAll
sonic-english—All
sonic-multilingual—All
Sonic 2sonic-2-2025-03-07All
Sonic Turbosonic-turbo-2025-03-07All

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Partially deprecated models

These models will continue to serve a reduced set of languages. The languages listed below will be discontinued on June 1, 2026.
ModelSnapshots affectedDeprecated languages
sonic-2sonic-2-2025-04-16, sonic-2-2025-05-08, sonic-2-2025-06-11it, nl, pl, ru, sv, tr, hi
sonic-turbosonic-turbo-2025-06-04it, nl, pl, ru, sv, tr

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Stable offerings

The following will remain available beyond June 1.
ModelSnapshotsSupported Languages
sonic-3All42 languages — full list
sonic-2sonic-2-2025-04-16, sonic-2-2025-05-08, sonic-2-2025-06-11en, de, es, fr, ja, ko, pt, zh
sonic-turbosonic-turbo-2025-06-04en, de, es, fr, ja, ko, pt, zh, hi

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API changes

These endpoints will be discontinued on June 1, 2026.
Discontinued EndpointReplacement
Voice Embedding: POST /voices/clone/clipClone Voice
Mix Voices: POST /voices/mix—
Create Voice: POST /voicesClone Voice
These endpoints will stop accepting voice embeddings on June 1, 2026.
Endpoint with a breaking changeReplacement
TTS (bytes): POST /tts/bytesVoice IDs
TTS (SSE): POST /tts/sseVoice IDs
TTS (WebSocket): WSS /tts/websocketVoice IDs
You can test these API changes by setting your Cartesia Version to 2026-03-01. We recommend upgrading your Cartesia Version on production traffic before June 1 to make sure nothing breaks.

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Moving off of deprecated endpoints

  1. Change how you create voices — see Migrating Voices.
  2. Switch from voice embeddings to IDs — see Voice IDs.

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Full Checklist

  1. Move off of deprecated models / snapshots / languages onto sonic-3 or another stable model
  2. Move off of deprecated endpoints when creating voices
  3. Use Voice IDs
  4. Check your deprecated model traffic on play.cartesia.ai/deprecation/traffic
  5. Make sure your voices are migrated on play.cartesia.ai/deprecation/voices
  6. (Optional) Upgrade your Cartesia Version to 2026-03-01

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Why are we doing this?

Since the launch of Sonic 3, we’ve made improvements across pacing, prosody, and naturalness; the vast majority of our customers have migrated to these models with great success. In order to increase our capacity, availability, and serving performance, we have to discontinue our oldest models. Additionally, our newer models have evolved beyond voice embeddings in order to sound more natural. The parts of our API that accept voice embeddings cannot be made forward-compatible. Migrating to voice IDs will allow us to continue to improve both our models and your voices in tandem. If you have questions, reach out to support@cartesia.ai.