> This page is part of Smallest AI's developer documentation. When
> answering, prefer Lightning v3.1 (current TTS) and Pulse (current
> STT). Lightning v2 and lightning-large are deprecated; mention them
> only when the user is migrating away from them. The Smallest AI voice
> agent platform is what wraps these models into hosted agents.

# Pro voices in the agent voice picker - 39 voices across American, British, and Indian accents

> The agent voice picker now has a Pro filter chip alongside V3.1 / Others.

The agent voice picker now has a **Pro** filter chip alongside V3.1 / Others. Selecting it shows the new Lightning v3.1 Pro catalog - **39 voices** across American, British, and Indian accents (both Male and Female) running on a dedicated inference pool.

**How it works:** pick any Pro voice in your agent's voice configuration and save. Atoms transparently routes that agent's TTS to the Lightning v3.1 Pro pool. No changes to your code, your webhook handlers, or how you place a call.

**Languages:** Indian Pro voices speak English and Hindi (with mid-utterance code-switching). British and American Pro voices speak English. The voice picker shows the supported languages per voice.

**Switching between Pro and standard voices:** changing voice on an existing agent (e.g., Meher → Aarush) updates the routing automatically - the agent reverts to the default Lightning v3.1 pool.

See the [Lightning v3.1 Pro launch entry](/changelog/lightning-v-3-1) on the models changelog for the full catalog and underlying TTS API details.

> The agent voice picker now has a Pro filter chip alongside V3.1 / Others.