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Start with Coda for new applications. Choose Mist v3 when the lowest time to first audio matters most, or when you need custom pauses or inline pronunciation control in English. Both are text-to-speech models. Speech-to-text has no model to choose: each request names its language, English or Spanish.

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Choose a model

For benchmark methodology, latency, and throughput numbers, see Latency. Rime supports Coda and Mist v3 through the cloud API and on-premises, and both stream audio over HTTP and WebSockets. On-prem image language coverage can differ from the cloud API. See the on-prem quickstart before provisioning a deployment.

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Feature matrix

Mist v3 serves English, French, German, and Spanish. See the language matrix for coverage per model. phonemizeBetweenBrackets works on English Mist v3 only. Coda and non-English Mist v3 ignore it. If your application depends on inline phoneme overrides, use English Mist v3. On Coda, send a custom lexicon with the request instead. Coda does not accept a lexicon in Arabic, Dutch, Hindi, or Japanese. For those languages, submit the word to Rime for the pronunciation dictionary, or respell it phonetically in plain English and accept an approximate result. See Custom pronunciation, and contact support@rime.ai if inline overrides are critical for you. Multilingual describes the model, not the individual voice. Almost every voice serves a single language, so the number of voices you can choose from depends on the language you need. Through the cloud API, Coda serves 10 languages across 312 voices, but 184 of those voices are English and only 1 is Dutch. Browse the Coda and Mist v3 catalogs to see the voices available in a given language.

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Coda

Coda, released May 2026, is Rime’s flagship TTS model. It pairs an LLM backbone with a dedicated speech inference engine trained on full-duplex conversational data.
  • Received the highest voice-quality scores in Rime’s human evaluations for naturalness, prosody, and artifact-free output
  • Sub-100ms model latency on the GPU engine when self-hosted or on-prem
    • Cloud API users typically add 25 to 50ms of network round-trip time from most of the continental US, because coda.api.rime.ai and mist.api.rime.ai route each request to the nearest Rime region
  • Ten cloud API languages: English, Arabic, Dutch, French, German, Hindi, Italian, Japanese, Portuguese, and Spanish. Each voice serves one of them
  • Word-level timestamps for text-audio alignment and interruption handling
  • Supports spell() for spelling sequences letter by letter or number by number
  • Accepts a custom lexicon of X-SAMPA pronunciations in English, German, Spanish, French, Italian, and Portuguese
  • Available with modelId: coda

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Mist v3

Mist v3, released March 2026, is the low-latency model in the Mist family.

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Legacy Mist models

Mist v1 (mist) and Mist v2 (mistv2) are legacy models. To move an existing integration, see Move from Mist v1 or Mist v2 to Mist v3.
Requests that omit modelId, or send a value the API does not recognize, are served by Mist v3. Set modelId explicitly on every request. Coda is never served by default.