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Inworld AI acquires Ultravox to build realtime speech-to-speech AI agent platform
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Inworld has acquired Ultravox, a platform used by developers to build realtime voice agents. The integration combines Ultravox's understanding and reasoning capabilities with Inworld's voice and realtime inference engine, creating a complete speech-to-speech loop: listen, understand, reason, act, respond. The first upgrade is already live, with built-in Inworld voices on Ultravox now running on Realtime TTS-2, offering natural-language steering for tone, pace, and emotion, support for over 200 languages, and sub-100ms first-audio latency. Users already using an Inworld voice on Ultravox receive the upgrade automatically with no migration, code changes, or additional cost. Voices from other providers remain unaffected. The endgame is a single realtime speech-to-speech system that understands, reasons, and speaks naturally.
Source report
Inworld has officially acquired Ultravox, the platform developers use to build realtime voice agents.
How It Works
First, Ultravox provides the brain:
- Understands what the user said and what they meant
- Reasons through it, calls tools, and completes the task
- Manages turn-taking, interruptions, and realtime responses
Then, Inworld provides the voice and realtime inference engine.
The complete loop now comes together:
Listen → Understand → Reason → Act → Respond
First Upgrade Now Live
Built-in Inworld voices on Ultravox now run on Realtime TTS-2, offering:
- Natural-language steering for tone, pace, and emotion
- 200+ languages
- Sub-100ms first-audio latency
If you are already using an Inworld voice on Ultravox, the upgrade is automatic — no migration, no code changes, and no additional cost.
Voices from other providers remain unaffected.
The Endgame
A single realtime speech-to-speech system that:
- Understands
- Reasons
- Speaks naturally
Source
DataChazNeutral / independent
Part of this Story
Inworld acquires Ultravox, unifies AI voice agent platform and speech model