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Ultravox

Speech-native model for real-time voice agents

Ultravox is an open source, real-time voice AI model and infrastructure created by Fixie.AI that enables developers to build conversational voice agents using a speech-native model rather than a traditional speech-to-text pipeline.

Voice AI Open Source Open Source Voice Model Developer Tools Popular on GitHub

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GitHub Stars: 4,504

Source: github.com/fixie-ai/ultravox · as of 2026-07-31

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