AssemblyAI
AssemblyAI: Universal-3.5 Pro
assemblyai/universal-3-5-pro
Universal-3.5 Pro is AssemblyAI's speech-to-text model served through its Sync API, returning a complete transcript with word-level timestamps in a single synchronous response for audio clips up to 120 seconds. It accepts 16-bit WAV input and supports free-text prompting, keyterms, and conversation context to steer transcription toward domain vocabulary.
Input
$83.3333
/ 1M tokens · Token reference
Output
$0
/ 1M tokens · Token reference
Context window
Not published
tokens
Transcription output · Token reference fields do not establish an output-unit price.
Model facts
Author
AssemblyAI
Tokenizer
Other
Modality
Audio -> Transcription
Created
Sep 22, 2026
Publication status
Hugging Face: not mappedLicense: not publishedParameter count: not published
Modalities
Input · AudioOutput · Transcription