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assemblyaiListed Sep 22, 2026

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....

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Provider endpoints1
Benchmark results9
Audio inputTranscription
Measured performance

Benchmark results

All leaderboards ↗

Word error rate · lower is better

Open ASR · AMI-Cleaned WER ↗English short-form; normalization unversioned
10.63% WER

assemblyai/universal-3-5-pro

Leaderboard entry
Open ASR · LS Clean WER ↗English short-form; normalization unversioned
1.1% WER

assemblyai/universal-3-5-pro

Leaderboard entry
Open ASR · LS Other WER ↗English short-form; normalization unversioned
2.11% WER

assemblyai/universal-3-5-pro

Leaderboard entry
Open ASR · SPGISpeech WER ↗English short-form; normalization unversioned
1.81% WER

assemblyai/universal-3-5-pro

Leaderboard entry
Open ASR · URGENT2024 WER ↗English short-form; normalization unversioned
9.08% WER

assemblyai/universal-3-5-pro

Leaderboard entry
Access & cost

Prices across providers

1 quote

Model specifications

Developer
assemblyai
Modality
Language
Context
Not reported
Maximum output
Not reported
Weights
Not reported
Provider listed
Sep 22, 2026
First discovered
Oct 16, 2026

Exact identities

  • openrouterassemblyai/universal-3-5-pro
  • open-asrassemblyai%2Funiversal-3-5-pro

Sources

OpenRouter ↗Open ASR Leaderboard ↗

Updated Oct 18, 2026

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assemblyaiListed 3 days ago

AssemblyAI: Universal-3.6 Pro

Universal-3.6 Pro is AssemblyAI's speech-to-text model and the successor to Universal-3.5 Pro, served here through AssemblyAI's Sync API. Compared with Universal-3.5 Pro, AssemblyAI reports 30% fewer errors…

Audio inputNo reported score
No reported score
$83.3333in$0.00out/ 1M tokens · USDOpenRouter
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