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Codex lets enterprise admins force a model provider and replace its local auth and headers
openai/codex PR #44650 (merged 2026-09-10) adds `model_provider` and `model_providers` to managed requirements. A required selection overrides local and session config, and each required provider definition replaces the local entry, auth and headers included. Integration tests check that discovery and inference go through the required gateway without leaking local headers. Related PRs add a restricted 'Open restricted' mode to the folder-trust prompt (#44732) and host-supplied thread instructions capped at 10,000 tokens (#44701).
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