Codex adds 12‑hour API cache and permanent user cache

Codex now caches API responses for 12 hours and keeps cache forever for logged‑in users across Codex & Work, with no penalties for revisiting old conversations.

Official：https://x.com/thsottiaux

Details on QuotaTick：https://quotatick.com/en/events/955b5f93-906d-47de-b726-155ded0b64c5

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