Microsoft AI · Voice model

MAI-Voice-2.1-Flash

microsoft/mai-voice-2.1-flash

Voice

Released Oct 1, 2026

MAI-Voice-2.1-Flash is a low-latency text-to-speech model from Microsoft AI, optimized for real-time responsiveness. It produces natural, expressive speech across 23 languages, with human-like intonation, rhythm, and emotional nuance. It is...

Specifications

Input: text, up to 20,000 characters per call
Output: mp3 (default) or raw pcm
Voice: provider voice ids via `voice`; omitted = the provider's default when it has one
Billing: per character of input text

Use it

POST /api/v1/audio/speech · MCP speak · full reference

curl https://omnirail.org/api/v1/audio/speech \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"microsoft/mai-voice-2.1-flash","input":"Hello from OmniRail. Every model, one key.","response_format":"mp3"}' \
  --output hello.mp3