1h ago

OpenAI rolled back an optimization in Codex that reduced cache hit rates and caused faster-than-expected usage limit depletion during long-running sessions

Engineering lead Thibault Sottiaux reset limits across all accounts.

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Original post

Some of you noticed limits drained faster in Codex, we root caused it to an optimization that we rolled back that had an impact on cache hit rates when compacting across long running sessions. We fixed this and have now reset usage limits for all accounts. Enjoy the weekend.

1:14 PM · May 23, 2026 View on X

yay! just in time for my massive multi-stage ubuntu laptop upgrade.

TiboTibo@thsottiaux

Some of you noticed limits drained faster in Codex, we root caused it to an optimization that we rolled back that had an impact on cache hit rates when compacting across long running sessions. We fixed this and have now reset usage limits for all accounts. Enjoy the weekend.

8:14 PM · May 23, 2026 · 136.8K Views
8:49 PM · May 23, 2026 · 947 Views

called it two days ago lol

TiboTibo@thsottiaux

Some of you noticed limits drained faster in Codex, we root caused it to an optimization that we rolled back that had an impact on cache hit rates when compacting across long running sessions. We fixed this and have now reset usage limits for all accounts. Enjoy the weekend.

8:14 PM · May 23, 2026 · 136.8K Views
8:27 PM · May 23, 2026 · 2.8K Views

PSA: Rate limits reset just in time for the long weekend!!

The limits draining issue has been rectified and all is well and good for better for day now

What’s are you building this weekend? :)

TiboTibo@thsottiaux

Some of you noticed limits drained faster in Codex, we root caused it to an optimization that we rolled back that had an impact on cache hit rates when compacting across long running sessions. We fixed this and have now reset usage limits for all accounts. Enjoy the weekend.

8:14 PM · May 23, 2026 · 136.8K Views
8:33 PM · May 23, 2026 · 3.5K Views
OpenAI rolled back an optimization in Codex that reduced cache hit rates and caused faster-than-expected usage limit depletion during long-running sessions · Digg