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Use the OpenAI-compatible base URL for OpenAI SDKs, Cursor, Codex, Cline, aider, and most custom tools:

Chat Completions

POST /v1/chat/completions is the most portable endpoint. It can call supported Claude, GPT, and Gemini models by id.

Responses

POST /v1/responses follows OpenAI’s newer Responses shape and serves GPT models. Use it for Codex-style GPT workflows. For Claude or Gemini, use Chat Completions unless your tool explicitly requires a different protocol.
POST /v1/responses/compact is available for clients that call the Responses compaction path, including Codex-style context compaction flows.

Models

Use GET /v1/models for an OpenAI-compatible model list. For the human-readable catalog, see Supported Models.