> 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.

# Waves docs v2.2.0 and v3.0.1 retired; v4.0.0 is now the sole documented surface

> The v4.0.0 doc surface is now the only supported view of the Waves models.

The **v4.0.0** doc surface is now the only supported view of the Waves models. The version dropdown no longer offers **v3.0.1** or **v2.2.0**, and the pages under those two versions have been removed from the docs site. Old bookmarked and search-indexed URLs 301-redirect to their v4 equivalents; where a specific v3.0.1/v2.2.0 page was renamed or merged in the v4 restructure, the redirect points at the closest v4 page (voice-cloning how-tos land on `Instant Clone (API)` etc.). The API-reference tabs on the retired versions rendered a completely different OpenAPI (Lightning v1/v2/large focused), so any auto-generated API-ref URLs on those versions land on the v4 API-ref authentication page.

Nothing changes at the API layer. The OpenAPI and AsyncAPI specs remain intact; SDK generation is unaffected. This is a docs-surface cleanup only. Customers running against the legacy `POST /waves/v1/lightning-v2/*` or `POST /waves/v1/lightning-large/*` routes continue to work exactly as before, and those routes' current status is documented under the deprecated entries in the v4 changelog and via the response `x-fern-availability: deprecated` markers.