Models

Pick a model with model in the init body of POST /v2/live.

model	choose it for
solaria-3	Multilingual conversations, automatic language detection, and translation: the only model that translates.
solaria-1	The widest language coverage: 99 languages and Cantonese, detected or set.
trantoria-1	The lowest latency, for voice agents: set the language spoken (about 40, English and Spanish included).

Without model, a session runs on your account’s default model.

Features by model

Feature	solaria-3	solaria-1	trantoria-1
Languages	29	99	about 40
Custom vocabulary	✓	✓	✓
Punctuation and casing	✓	✓	✓
Numbers as digits	✓	✓	✓
Named entities	✓	✓	✓
PII redaction	✓	✓	✓
End of turn	✓	✓	✓
Number hold	✓	✓	✓
Sentiment	✓	✓	✓
Speaker diarization	✓	✓	✓
Translation	✓	—	—

A session that asks a model for a feature it does not run (translation on solaria-1, for example) finds no model to serve it: POST /v2/live answers 500 with no inference endpoint available. Check the table before you combine a model and a feature.

Latency profiles

Each model trades latency for accuracy with a latency profile: fast, medium, balanced or precise. Add it to the model’s name, or set it alone with profile:

{ "model": "solaria-3-fast" }

{ "model": "trantoria-1", "profile": "precise" }

fast gives the earliest partial and final transcripts, precise the most accurate ones. Your account may have a default profile; a session that names one uses its own.

Choosing

• Voice agent: trantoria-1-fast or solaria-3-fast, with end-of-turn detection.
• Meeting notes, call analytics: solaria-3 or solaria-1 with balanced or precise, and diarization or one channel per speaker.
• Live captions in several languages: solaria-3 with translation.