MAI-Voice-2 is a high-fidelity, expressive text-to-speech model from Microsoft, powered by Azure AI Speech. It synthesizes natural-sounding speech across 10+ languages with support for expressive SSML styles (cheerful, sad, excited, etc.) and speed control (0.5×–2×). Voice names follow the Azure locale format (e.g., en-US-Harper:MAI-Voice-2). Output is available in MP3 and PCM at 24 kHz.
Modalities
Price
$22/M characters
Released
Jun 2, 2026
Weekly Tokens
1.19M
Create an API key from your OpenRouter dashboard and set it as an environment variable:
Use microsoft/mai-voice-2 with the OpenRouter API:
OpenRouter provides a text-to-speech API that converts text into natural-sounding audio. Send text and a voice selection, and receive raw audio bytes in your chosen format.
The response is a raw audio stream (not JSON). The generation ID is returned in the X-Generation-Id response header for tracking.
For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.
Synthesizes audio from the input text. Returns a raw audio bytestream in the requested format (e.g. mp3, pcm, wav).
https://openrouter.ai/api/v1/audio/speechBearer $OPENROUTER_API_KEYapplication/jsonoptional — your site URL, for rankingsoptional — your site name, for rankingsmicrosoft/mai-voice-2| Name | Type | Default | Description |
|---|---|---|---|
max_tokens | integer | — | This sets the upper limit for the number of tokens the model can generate in response. |
temperature | float | 1 | This setting influences the variety in the model's responses. |
top_p | float | 1 | This setting limits the model's choices to a percentage of likely tokens: only the top tokens whose probabilities add up to P. |
max_completion_tokens | integer | — | This sets the upper limit for the number of tokens the model can generate in response. |