OpenAI – 12 hour cache (API) available and "cache forever" for work/codex users (twitter.com)

> You can now cache for 12h in the API and for logged in users across Codex & Work we keep cache forever and you don’t have any penalty for coming back to an old conversation or resuming after a few hours and are now guaranteed to hit the cache.

Direct text from tweet

Deepseek effect?