For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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OverviewAPI ReferencePre-recorded STTStreaming STTVoice AgentsSpeech UnderstandingGuardrailsLLM GatewayFAQ
OverviewAPI ReferencePre-recorded STTStreaming STTVoice AgentsSpeech UnderstandingGuardrailsLLM GatewayFAQ
  • Overview
      • Am I charged for transcribing silent audio?
      • Are Custom Models More Accurate than General Models?
      • Do I Get Charged for Failed API Calls?
      • Are there any limits on file size or file duration for files submitted to the API?
      • Can I customize how words are spelled by the model?
      • Can I delete the transcripts I have created using the API?
      • Can I get a list of all transcripts I have created?
      • Can I send audio to AssemblyAI in segments and still get speaker labels for the whole recording?
      • Can I submit files to the API that are stored in a Google Drive?
      • Can I use the API without internet access?
      • Do we have resources for building with Make?
      • Do you have any examples for how to use your API?
      • Do you have example use cases for using AssemblyAI?
      • Do you offer cross-file Speaker Identification?
      • Do you offer translation?
      • Do you offer voice-to-voice or text-to-speech (TTS)?
      • Does it cost extra to export SRT or VTT captions?
      • Is there a way to generate SRT or VTT captions with speaker labels?
      • Does it cost more to transcribe an audio or video?
      • Does your API return timestamps for individual words?
      • How are individual speakers identified and how does the Speaker Label feature work?
      • How are paragraphs created for the /paragraphs endpoint?
      • How are word/transcript level confidence scores calculated?
      • How can I integrate AssemblyAI with other services?
      • How can I make certain words more likely to be transcribed?
      • How can I test AssemblyAI without writing code?
      • How can I transcribe YouTube videos?
      • How do I generate subtitles?
      • How does AssemblyAI compare to other ASR providers?
      • How does Automatic Language Detection work?
      • How does the API handle files that contain spoken audio in multiple languages?
      • How long does it take to transcribe a file?
      • What should I do if I'm getting an error?
      • Is there a Postman collection for using the API?
      • Is there a way for us to send the start time / end time for transcription instead of transcribing the whole length of a call recording?
      • Is there an OpenAPI spec/schema for the API?
      • read operation timed out" error
      • Should I use Speaker Labels or Multi-channel?
      • What are the recommended options for audio noise reduction?
      • What audio and video file types are supported by your API?
      • What IP Address Should I Whitelist for AssemblyAI?
      • What is the minimum audio duration that the API can transcribe?
      • What is the recommended file type for using your API?
      • What types of audio URLs can I use with the API?
      • Where can I find a list of recent changes to the API?
      • Where can I find cURL code examples?
      • Why can't I access recording URLs from the /upload endpoint directly?
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OverviewPre-recorded audio

Do you offer voice-to-voice or text-to-speech (TTS)?

Yes! The Voice Agent API provides a complete voice-to-voice pipeline through a single WebSocket connection. It combines AssemblyAI’s speech-to-text, LLM reasoning, and text-to-speech into one integrated service — you stream audio in and receive spoken audio back in real time.

The Voice Agent API is billed at a single all-in rate of $4.50/hr covering STT, LLM reasoning, and TTS. See the Voice Agent API documentation to get started.

AssemblyAI does not offer standalone text-to-speech as a separate service. TTS is available as part of the Voice Agent API pipeline.

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