Overview
AssemblyAI is the best way to build Voice AI apps. We build the industry’s best speech-to-text and speech understanding models, including promptable speech recognition, that serve as critical infrastructure for top Voice AI products like Granola, Dovetail, Ashby, and Cluely.
Our speech-to-text models lead the industry in accuracy and quality, so you can build reliable product experiences on top of voice data. And our Speech Understanding models help you go beyond transcription to uncover insights, identify speakers, and highlight key information.
We make it simple to get started, with a developer-first API and usage-based pricing that scales effortlessly to millions of hours.
Funding rounds
Disclosed funding: $113.1M across 8 rounds. Latest: Series C, 3 Dec 2023.
3 rounds have an undisclosed amount, not included in the total.
| Date | Type | Amount |
|---|---|---|
| 3 Dec 2023 | Series C | $50M |
Office locations
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Latest videos from AssemblyAI on YouTube
I spent $10,000 on tokens. It should’ve cost $100!!
Great at coding isn’t always great at voice! Meet Voice Standard Bench.
Best LLM for transcripts: 50+ models on real voice tasks
Benchmark LLMs on your own transcripts with Voice Standard Bench
Recent posts from the AssemblyAI blog
- Gemini 4 Argon just posted the top dictation score on Voice Standard Bench: 99.5, the highest of the 50+…
models we've tested. Google's newest model is live on LLM Gateway, so you can call it through the same OpenAI-compatible endpoint and API key you use for AssemblyAI Speech-to-Text.
- Universal-3.6 Pro is now available on OpenRouter.
If your team already routes LLM calls through OpenRouter, you can add Speech-to-Text on the same API key. AssemblyAI's Sync is the simplest path from a short clip to text: one HTTP request in, one finished transcript back in the same response.