# Conversational AI documentation (/en/ai/documentation-versions)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

Choose the documentation for the API you use:

- [Main — Voice Agent API](/en/ai)
- [Preview — Conversational AI Platform](/en/ai/platform)

This entry opens Main by default, or restores your previous documentation selection. Each version's direct links always open that version.