Documentation
Codex Key technical docs: quickstart, models, authentication, API reference, billing.
- QUICKSTART
Quickstart
Sign up, top up your balance, issue an API key, and run your first Codex Key request in 5 minutes.
Open → - MODELS
Models reference
GPT-5.4, GPT-5.5, Codex-5.3, GPT-5.4-mini, Fast and Priority tiers — cost coefficients, reasoning effort levels, selection guide.
Open → - AUTH
Authentication
API key format, Authorization header, key rotation, and security best practices for Codex Key.
Open → - API
API reference
Full Codex Key endpoint reference: /v1/chat/completions, /v1/responses, /v1/models. Parameters, request and response examples, error codes.
Open → - BILLING
Billing
How token cost is calculated, the 1.09 margin, reasoning-effort multipliers, viewing spend at /cabinet/logs, and top-up methods.
Open →