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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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Production-grade speech-to-text and Speech Understanding in a single API. Ship accurate transcription, diarization, and audio intelligence—fast.
Thanks for hopping on, let’s kick off the Q3 planning sync.
Sounds good. I’ll walk through the Acme Robotics numbers first.
Perfect, then we’ll cover the roadmap and timelines.
Industry-leading word accuracy and speaker diarization, validated on real-world audio—fewer corrections, fewer customer complaints.
Clean SDKs for Python, JavaScript, and more. One API call to transcribe; one to add summarization, sentiment, or redaction.
No concurrency limits, no throttles. The same platform carries you from your first 100 hours to 400,000 a month.
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 and put speech-to-text to work right away. Test it in the no-code playground, then copy a ready-made request into your app.
Start building freeNo credit card required
Word accuracy rate is the share of words transcribed correctly against a verified reference transcript—the standard measure of speech-to-text quality.
Average word accuracy across 26 real-world datasets.
*Higher is better*Source: AssemblyAI published benchmarks, March 2026.
