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v0.2.20

fixie-ai/ultravoxv0.2.20Mar 12, 2026by QuentinFuxa

AI Summary

Introduces a new Qwen3-ASR backend and optimizations for bandwidth and session management in the Ultravox project.

Key Highlights

  • Qwen3-ASR Beta backend with ForcedAligner timestamps
  • Opt-in DiffTracker WebSocket protocol for bandwidth efficiency
  • Thread-safe per-session language override in SessionASRProxy

New Features

  • Qwen3-ASR Beta backend with forced alignment and auto language detection
  • DiffTracker opt-in snapshot-then-diff WebSocket protocol
  • SessionASRProxy thread-safe per-session language override

Full Release Notes

## Core
- **Qwen3-ASR Beta** : New backend with ForcedAligner word-level timestamps, auto language detection, and Whisper-style model aliases
- **DiffTracker** : Opt-in snapshot-then-diff WebSocket protocol (`?mode=diff`) for bandwidth efficiency
- **SessionASRProxy** : Thread-safe per-session language override