Breaking

Inworld Acquires Ultravox to Expand Realtime Voice-Agent Stack

September 30, 2026 at 16:50 EDT

AI Agents
Foundation Models
Media Generation

Inworld said on September 30, 2026 that it has acquired Ultravox, the platform for building realtime voice agents, in a deal aimed at combining speech understanding, reasoning and expressive speech generation inside live AI conversations. The company said Ultravox team members who joined Inworld will keep developing the platform, and the first product change is already live: built-in Inworld voices on Ultravox now run on Realtime TTS-2 with no code changes required for existing voice IDs.

Sep. 30, 2026 - Inworld

Inworld Adds Ultravox

The acquisition joins Ultravox's live voice-agent platform with Inworld's speech models and realtime inference stack. The first visible change is an automatic Realtime TTS-2 upgrade for built-in Inworld voices on Ultravox.

97.00%

Ultravox v0.7 Big Bench Audio with reasoning

spoken languages listed for Ultravox Realtime

100+

languages targeted by Realtime TTS-2 switching

code changes for existing Inworld voice IDs

Speech understanding benchmark

Big Bench Audio scores, shown on one percentage scale.

The combined loop

Listen

Speech understanding, voice profiling and turn-taking

→

Reason

Task completion, retrieval and tool calls

→

Speak

Expressive Realtime TTS-2 with steering

Builder upside

Automatic TTS-2 upgrade, stable existing voice IDs and a tighter path from speech understanding to expressive replies.

Practical cautions

Pacing and intonation may differ after the upgrade; other provider voices are unchanged today.

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