# Reasoning (Discontinued)

> The legacy reasoning endpoint has been permanently discontinued.

Canonical URL: https://s1.dev/zh/docs/advanced/reasoning

> **warn:** `POST /v1/chat/completions` has been permanently discontinued and returns
> `410 Gone`. Do not build new integrations against this endpoint.

Remove calls to this endpoint from existing integrations. Search1API does not
currently expose a replacement reasoning or chat-completions API.