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Top Voice AI companies are building with Assembly.
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Latest Release
Text-to-Speech API
Our first text-to-speech model, AssemblyAI-TTS-1, is built for voice agents, on live calls. It sounds natural, responds fast, and keeps callers on the line.
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Get started for free, then from $0.15/hr—no commitments, no minimums, no credit card to start. See exactly how AssemblyAI's accuracy and price stack up against the providers on our published benchmarks.
Our invoice total came to 14,250 dollars for Q3.
Confirmed—I'll send the breakdown to finance@acme.io.
Great, let's lock it in for the board deck.
Pay as you go from $0.15/hr with no commitments, no minimums, and no lock-in.
Best-in-class word error rate on our published benchmarks, so you never trade accuracy for cost.
Request a custom benchmark on your own audio across AssemblyAI and other providers, with full methodology. A BAA is available for customers processing PHI.
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 with credits included—no credit card. Test in the no-code playground, then move to production from $0.15/hr with no minimums or commitments.
Start building freeNo credit card required
Low price only matters if the transcript is right. Word error rate is the share of words the model gets wrong against a human reference—the standard measure of Speech-to-Text accuracy.
Average normalized WER across synthetic medical, accented English, general speech and webinar sets.
*Lower is better*Source: AssemblyAI published benchmarks (assemblyai.com/benchmarks), pre-recorded tab, updated July 2026.
