Capability change announced Jul 10, 2026
AssemblyAI documents a capability change: “# Deprecated: Async speech_model Parameter Passing a current model name ( universal-2 , universal-3-5-pro ) to the async speech_model field now returns a 400.”
- Hosting route
- First-party API
- Affected scope
- Not stated in the notice
- Announced
- Jul 10, 2026
- First seen by ModelClock
- Oct 15, 2026
What the provider published
assemblyai.com ↗# Deprecated: Async speech_model Parameter
Passing a current model name ( universal-2 , universal-3-5-pro ) to the async speech_model field now returns a 400. Passing a legacy name ( best , nano , universal ) returns 200 but always routes to the default model…
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Passing a current model name (
universal-2,universal-3-5-pro) to the asyncspeech_modelfield now returns a 400. Passing a legacy name (best,nano,universal) returns 200 but always routes to the default model. Usespeech_modelsto pin a specific model.nanohas been removed from the documented legacy names.
Read from the provider's text; the quote is the provider's exact lines.
