Skip to main content
Built for real engineering decisions

AI Model & API Guides

Source-linked guidance for AI models, API integration, and developer workflows—turning fast-changing prices, quotas, capabilities, and limits into decisions you can verify.
  • Primary sources first
  • Reproducible steps and failure boundaries
  • Volatile facts carry review dates
  • 478 articles
  • 6 languages
  • 12 topics
  • Updated Oct 6, 2026

Codex token-exchange 403: read the full error, preserve response details, distinguish an unexplained refusal from a country, account or workspace restriction, and check the actual Codex host
Developer Tools & Agents

Codex Token Exchange Failed 403: Diagnose and Recover Sign-In

A Codex token-exchange 403 is a refused authentication request. The full error tells you whether to repair callback access, check the client’s network, renew stored credentials, or stop for an access restriction.

11 min