> 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.

# Lightning v3.1 Pro - premium voice catalog across American, British, and Indian accents

> Lightning v3.1 now has a Pro tier with 39 curated voices across American, British, and Indian accents (both Male and Female).

Lightning v3.1 now has a **Pro** tier with **39 curated voices** across American, British, and Indian accents (both Male and Female). The Pro pool runs on dedicated inference capacity, delivering the same TTFB as standard Lightning v3.1.

**What's in the catalog:**

* **Indian - Female (8)**: Rhea, Zariya, Kareena, Mishka, Inaaya, Saira, Meher, Aarini
* **Indian - Male (5)**: Aviraj, Vyom, Zoravar, Reyansh, Ahan
* **British - Female (6)**: Cressida, Elowen, Ottilie, Seraphina, Tabitha, Arabella
* **British - Male (7)**: Benedict, Cormac, Everett, Finley, Rupert, Winston, Caspian
* **American - Female (7)**: Willow, Autumn, Skylar, Savannah, Kennedy, Reagan, Sierra
* **American - Male (6)**: Maverick, Brooks, Hunter, Colton, Wesley, Asher

**Languages supported:** Indian voices speak English and Hindi (with native code-switching when `language="auto"`). British and American voices speak English. See per-voice `tags.language` via `GET /waves/v1/lightning-v3.1/get_voices`.

**How to use it:**

* **Atoms voice agents:** open the agent's voice picker and select the new **Pro** filter chip, then pick any Pro voice. Atoms transparently routes to the Pro pool - no other configuration needed.
* **API (direct):** use the unified `POST /waves/v1/tts` (sync), `POST /waves/v1/tts/live` (SSE), or `WSS /waves/v1/tts/live` (WebSocket) endpoints and pass `"model": "lightning_v3.1_pro"` in the request body alongside the chosen `voice_id`. The legacy `/waves/v1/lightning-v3.1/*` routes also accept the `model` field for backwards-compatible Pro opt-in.

**Voice cloning:** not available on Lightning v3.1 Pro. Voice clones continue to use Lightning v3.1 (standard) and the existing voice-cloning flow. There is no migration required.

For the full catalog, integration examples, and a Python WebSocket sample, see the [Lightning v3.1 Pro model card](/model-cards/text-to-speech/lightning-v-3-1-pro).