La nueva API de TTS de AssemblyAI, con un costo de 15 USD por millón de caracteres, ofrece una síntesis de voz asequible y de baja latencia para agentes telefónicos en vivo, simplificando el desarrollo al unificar la conversión de voz a texto y de texto a voz bajo un solo proveedor.
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AssemblyAI has released AssemblyAI-TTS-1, its first text-to-speech model, now generally available. The AssemblyAI-TTS-1 text-to-speech API targets voice agents running on live phone calls. In that setting, latency and pronunciation decide whether a caller stays on the line. Pricing is $15 per 1M characters, with no annual contract and no concurrency tier to buy. For developers already using AssemblyAI speech-to-text, it closes the voice loop with one vendor. TL;DR Size: It is a hosted API model. Runs on: AssemblyAI’s cloud only, in the US (us-east-1) or EU (eu-north-1). No open weights or on-prem option. Any client with HTTP or WebSocket works. Performance: Ties ElevenLabs v4 on entity accuracy in AssemblyAI’s tests, at under 1/5 of its price. Best: 47 ms median time to first byte across 6 models in AssemblyAI’s API test (self-reported). Worst: 159 ms median streaming latency on Cekura’s independent benchmark, 8th of 19 timed models. Bottom line: Best: $15 per 1M characters with unlimited concurrency. Worst: no SSML, speed control, pronunciation dictionaries or emotion tags yet. What is AssemblyAI-TTS-1? AssemblyAI-TTS-1 is a streaming text-to-speech model from AssemblyAI that turns agent replies into speech for live calls. It was trained on millions of hours of audio, including real conversational data. Most TTS models represent audio as discrete tokens. AssemblyAI says TTS-1 operates on continuous audio representations instead. The AssemblyAI claims this improves realism and cuts time to first spoken audio. The launch includes a library of 4,000+ voices and instant voice cloning. A clone needs a short recording and a confirmation of the speaker’s permission. The clone in the launch post used 24 seconds of audio. Six languages are supported at launch: English, Spanish, French, German, Italian and Portuguese. How do developers integrate AssemblyAI-TTS-1? There are 3 interfaces: an HTTP API, a WebSocket API and an OpenAI-compatible route. The WebSocke
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