---
id: "assemblyai/universal-3-5-pro"
also: ["assemblyai/universal-3-5-pro-20260914"]
card_usd_per_m: "83.3333 in, 0.0 out, at assemblyai"
cheapest_list_usd_per_m: "83.3333 in, 0.0 out, at assemblyai on openrouter"
context: 0
max_output: 0
input: ["audio"]
output: ["transcription"]
released: "2026-09-22"
api: ["/api/v1/audio/transcriptions"]
endpoints: 1
gateways: "openrouter (1)"
no_training: 1
trains: 0
retains_prompts: 0
---
# 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 up to 20 minutes. It...