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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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The browser's SpeechRecognition is fine for a demo, but it's Chromium-biased, inconsistent across browsers, and gives you no server control. AssemblyAI's streaming speech-to-text gives you production-grade, real-time transcription you actually own.
Let's pull up the Q3 revenue numbers before the call.
Can you transcribe this in real time across every browser?
Yes—same WebSocket, same accuracy, Chrome, Safari, or Firefox.
One WebSocket pipeline transcribes identically in Chrome, Safari, and Firefox—no Chromium lock-in.
Pick your model and data zone instead of handing audio to an opaque browser-vendor service with no data agreement.
Real-time streaming with speaker labels and consistent accuracy on noisy, accented, and technical speech.
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.”
Capture mic audio the same way you do today, but stream it to AssemblyAI over a WebSocket instead of the browser engine. You get real-time turns that work in every browser—and you own the model, the data zone, and the SLA.
Start building freeNo credit card required
The browser's recognizer is a black box. Streaming word error rate measures real-time accuracy against a human reference, so you can see exactly what you gain by moving off it.
Streaming word error rate on English audio.
*Lower is better*Source: AssemblyAI published benchmarks — assemblyai.com/benchmarks.
