OpenAI Codex 401 Outage OpenAI's Codex service experienced a 401 authentication outage, and the company said logging in via API key would unblock access at that time. OpenAI reported the availability metrics at an aggregate level across all tiers, models and error types, noting that individual customer availability may vary by subscription tier and the specific model and API features in use. Login via API key will unblock access at this time. Availability metrics are reported at an aggregate level across all tiers, models and error types. Individual customer availability may vary depending on their subscription tier as well as the specific model and API features in use.