> 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.

# Atoms API - Conversation cancel, recording URL, retries endpoints

> The Atoms OpenAPI spec now covers four customer-facing Conversations endpoints: POST /conversation/cancel (body-form), POST /conversation/{id}/cancel.

The Atoms OpenAPI spec now covers four customer-facing Conversations endpoints: `POST /conversation/cancel` (body-form), `POST /conversation/{id}/cancel` (path-form, only `IN_QUEUE` calls), `GET /conversation/logs/{id}/recording/download-url` (returns a pre-signed URL), and `GET /conversation/logs/{callId}/retries` (call-family retry attempts).

Spec only - no SDK regen yet. The new methods will land on the next Python SDK release that picks up these paths.