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Grok Voice Realtime: xAI’s Audio-to-Audio Model Explained

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Overview

grok-voice/realtime is maintained by xai. grok-voice/realtime is an xAI Grok audio-to-audio model exposed through fal as fal-ai/grok-voice. It accepts a user speech recording, applies optional system instructions and tool configuration, and returns the agent’s spoken response as an audio file plus transcript text and duration. It is best suited to voice assistants, phone agents, and interactive voice systems; the supplied schema describes file-based audio input and output, while the model description also identifies bidirectional WebSocket streaming as the intended real-time architecture.

Best use cases

  • Voice assistants: provide an audio recording and optional persona or conversation-context instructions, then receive spoken output and its transcript.
  • Phone agents: use the speech-response workflow for conversational call experiences, subject to your own telephony integration.
  • Interactive voice systems: configure web search, X search, or MCP servers when the agent needs external information or tools.
  • Prototypes for real-time voice applications: the model description specifically targets bidirectional...

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