MAI-Voice-2.1
Microsoft's most expressive text-to-speech model — 23 languages with native-accent cross-language voice identities.
About
MAI-Voice-2.1, released October 1, 2026 alongside MAI-Transcribe-2-Streaming and the fast MAI-Voice-2.1-Flash, is Microsoft AI's multilingual text-to-speech model for voice agents. Microsoft describes it as its most expressive such model yet: natural, expressive speech in 23 languages, with cross-language voice identities that keep native accents when switching languages.
Both voice models can replicate voices from a few seconds of reference audio, gated behind access approval and consent requirements. The Flash variant is built for responsive, high-volume use cases at $15 per million characters versus $22 for the full model. All three launched in public preview through Microsoft Foundry and Azure AI Speech, and Vercel's AI Gateway carries the MAI voice and transcription lineup.
No independent quality benchmarks have been published, so the expressiveness claims are Microsoft's own until third parties evaluate the voices.
Specs
Context window
Pricing
Free quota
API access
Weights
Released
Benchmarks
No independent quality benchmarks found; provider describes it as its most expressive TTS model.
Provider-reported unless a source says otherwise. Benchmarks are marketing-adjacent by nature — treat them as directional.
Use cases
Trust score — 7/10
Launch facts (October 1, 2026; 23 languages; $22/$15 per 1M characters; Foundry public preview) corroborated across independent outlets. Docked for: (1) no independent quality benchmarks — expressiveness claims are Microsoft's own; (2) public preview with no SLA; (3) voice cloning requires access approval and consent, which limits availability.
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 7.0/10
- Maintenance · recency, releases, issue load
- 8.0/10
- Openness · license + docs
- 3.0/10
- Manual review · sanity read + red-flag check
- 7.0/10
- · Adoption 7: launched Oct 1, 2026 with Transcribe-2-Streaming; multiple outlet corroboration of specs and pricing
- · Maintenance 8: Foundry public preview; Flash variant for high-volume tier
- · Openness 3: proprietary API-only, no weights
- · Manual 7: 23 languages and $22/$15 per 1M chars verified; expressiveness claims are Microsoft's own, no independent benchmarks