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| 2 models | assemblyaiAssemblyAI: Universal-3.5 ProRemove × | espnetespnet/owsm_ctc_v4_1BRemove × |
|---|---|---|
| What’s different | 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... | 1B parameters · 75 languages · Encoder: Whisper · Decoder: CTC |
| Date | Sep 22, 2026Listed | Oct 17, 2026Discovered |
API prices USD · provider configuration shown below | ||
| Listed rate | $83.3333 in / $0.00 out/ 1M tokensOpenRouter · all routes ↗ | See provider quotes |
| Provider endpoints | 1 endpoint → | 0 endpoints → |
Benchmarks Each result retains its evaluation configuration | ||
| AMI-Cleaned WER ↗English short-form; normalization unversioned | 10.63% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 11.1% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
| Earnings22-Cleaned-AA-chunked WER ↗English short-form; normalization unversioned | 6.05% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 10.31% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
| Gigaspeech-Cleaned WER ↗English short-form; normalization unversioned | 7.62% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 9.29% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
| LS Clean WER ↗English short-form; normalization unversioned | 1.1% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 2.11% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
| LS Other WER ↗English short-form; normalization unversioned | 2.11% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 4.38% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
| SPGISpeech WER ↗English short-form; normalization unversioned | 1.81% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 2.31% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
| URGENT2024 WER ↗English short-form; normalization unversioned | 9.08% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 16.12% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
| Voice Arena Monsoon WER ↗English short-form; normalization unversioned | 3.49% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 6.66% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
| Voxpopuli-AA-Cleaned WER ↗English short-form; normalization unversioned | 1.92% WER ↗assemblyai/universal-3-5-proLeaderboard entry | 4.09% WER ↗espnet/owsm_ctc_v4_1BLeaderboard entry |
Specifications | ||
| Context window | — | — |
| Max output | — | — |
| Parameters | — | 1B |
| Audio input | Supported | Supported |
| Transcription | Supported | Supported |