Setup and troubleshooting guides

Copy-ready guides for Codex CLI, Cursor, OpenAI SDKs, and compatible API users.

ACCOUNT TO FIRST REQUEST

Codex API Quickstart: Account, Credit, API Key, and CLI Setup

Follow the full user journey from account creation and billing to a verified Codex CLI request.

Updated July 21, 2026 · 10 min read CODEX CLI

Codex CLI Custom API Setup: Base URL and API Key

Configure an environment variable and config.toml, then fix common 401, 404, 429, and model errors.

Updated July 10, 2026 · 8 min read