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Top Voice AI companies are building with Assembly.
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Latest Release
Universal 3.5 Pro
Our new flagship speech-to-text model handles real-world audio the way it actually happens. Available for real-time and pre-recorded audio.
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We're giving Biography podcast listeners $100 in free credits to try AssemblyAI's speech-to-text and Speech Understanding models. We can't wait to see what you build.
She was born in Vienna in 1931, the youngest of four.
And that early period shaped everything that came after.
Let's trace the story from there.
Unlock the value of pre-recorded voice data and power workflows with unmatched accuracy.
Build voice agent workflows with ultra-low latency, high accuracy, and precise end-of-turn control.
Enable deep analysis and high-value insights with sophisticated Speech Understanding models.
36%
improvement in close rate
“The new Universal-3.5 Pro speech model from AssemblyAI is best so far in terms of accuracy, latency, and language switching.”
80%
increase in customer satisfaction
“Assembly has saved us countless hours managing models, and provided exceptional accuracy.”
36%
improvement in close rate
“The new Universal-3.5 Pro speech model from AssemblyAI is best so far in terms of accuracy, latency, and language switching.”
80%
increase in customer satisfaction
“Assembly has saved us countless hours managing models, and provided exceptional accuracy.”
Create a free account, drop in your API key, and transcribe your first file in minutes. Test in the no-code playground, then copy a ready-made request into your app—the credits are already waiting.
Claim $100 in free creditsNo credit card required
Your product is only as good as the inputs it's built on. Word error rate is the share of words the model gets wrong against a human reference—the standard measure of transcription accuracy.
Pre-recorded word error rate on English audio.
*Lower is better*Source: AssemblyAI published benchmarks — assemblyai.com/benchmarks.
