Changelog

simba-3.2 no longer requires a voice to be registered for it. Every English voice in GET /v1/voices now synthesises on it, your workspace’s own cloned voices included, and each voice’s models array lists it. Before today it served eight registered voices out of a catalogue of nearly a thousand, and any other voice returned 400.

Nothing about the request changes, and nothing you already send breaks: the eight voices built for the model are served by exactly the training they were before, and every other voice is served by the model’s zero-shot training — the same one that has served cloned voices on simba-3.2 since 2026-08-26. Which training runs is an internal routing detail; the request, the response, the latency class and the audio format are identical either way.

This is what makes the Simba 1.6 retirement on 2026-09-21 a one-line change. simba-english and simba-multilingual are switched off entirely on 2026-11-21, and the 953 catalogue voices registered for them can now move straight to simba-3.2 — an English voice — or to simba-3.0 for any other language, with no voice substitution.

curated_voices on GET /v1/audio/models is deprecated and is now false for every model. No model restricts synthesis to a registered voice set any more, so a picker that filters on the flag simply stops filtering. The field stays on the response; read english_voices_only instead, which is the one voice constraint left — a model with no multilingual training returns 400 for a non-English voice.