AssemblyAI
Speech-to-text and speech understanding API company
assemblyai.comSan Francisco, United States
AssemblyAI is a San Francisco speech AI company that sells speech-to-text and audio intelligence through a developer API. It was started in 2017 by Dylan Fox and trains its own Universal and Conformer series speech recognition models.
- Founded
- 2017
- Type
- Private company
- Founder
- Dylan Fox
- AI lab
- Inference provider
- 4 hosted endpoints
Catalogue
All models by AssemblyAI
12 models · 1–12
| Select models to compare | Model | Released | Context | Input /M | Output /M | Parameters | Type | I/O | Openness |
|---|---|---|---|---|---|---|---|---|---|
| TTS 1AssemblyAI | October 27, 2026 | — | $15.00 | $0.00 | — | Speech | text → speech | Closed | |
| Universal-3.6 ProAssemblyAI | September 29, 2026 | — | $83.3333 | $0.00 | — | Transcription | audio → transcription | Closed | |
| Universal-3.5 ProAssemblyAI | July 7, 2026 | — | $83.3333 | $0.00 | — | Transcription | audio → transcription | Closed | |
| Universal-3 Pro StreamingAssemblyAIRetired | March 3, 2026 | — | — | — | — | Transcription | audio → transcription | Closed | |
| Universal-3 ProAssemblyAIDeprecated | February 3, 2026 | — | — | — | — | Transcription | audio → transcription | Closed | |
| Universal-Streaming MultilingualAssemblyAI | November 12, 2025 | — | — | — | — | Transcription | audio → transcription | Closed | |
| Universal-StreamingAssemblyAI | June 2, 2025 | — | — | — | — | Transcription | audio → transcription | Closed | |
| Slam-1AssemblyAI | April 23, 2025 | — | — | — | — | Transcription | audio → transcription | Closed | |
| Universal-2AssemblyAI | October 31, 2024 | — | — | — | — | Transcription | audio → transcription | Closed | |
| Universal-1AssemblyAIRetired | April 3, 2024 | — | — | — | — | Transcription | audio → transcription | Closed | |
| Conformer-2AssemblyAIRetired | July 19, 2023 | — | — | — | — | Transcription | audio → transcription | Closed | |
| Conformer-1AssemblyAIRetired | March 15, 2023 | — | — | — | — | Transcription | audio → transcription | Closed |