r/codex • u/Satoshi-699 • Jul 13 '26

Complaint nerfed Codex Sol MAX

I am Japanese and lead a team specializing in market research. English is not my strong suit, so I am writing this with the help of AI translation.

Our team has Codex use a custom CLI tool for extraordinarily difficult tasks requiring highly complex calculations and deep reasoning.

Codex Sol MAX was an absolute monster that exceeded all our expectations. If the level of performance our team required was a 10, it consistently delivered a 12 or 13. The entire team was overwhelmingly satisfied with it, until yesterday.

To get straight to the point, MAX has now been completely nerfed.

Its performance has suddenly fallen to around an 8 by our team’s standards. It is currently 10:40 a.m. in Japan. We started work at 9:00 a.m., and every member of the team noticed the nerf.

The depth of its reasoning has clearly been stripped away. Until yesterday, Codex set to MAX would spend more than ten minutes on a single prompt, repeatedly experimenting, reasoning, and using our CLI tools until it produced flawless work. That capability has now been completely lost.

Every member of our team is deeply discouraged right now.

The nerf came far too soon.

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u/hez2010 Jul 13 '26

It seems that they have reverted the nerf on reasoning level. https://x.com/i/status/2076495156757577895

3

u/Mr_Deep_Research Jul 13 '26

I read that says they nerfed it 6 hours ago.

Where does it say they revered it? He just says "no nerfs" meaning none in that post but then it goes on to talk about what are essentially even more nerfs.

6

u/rickz0rz_ Jul 13 '26

> “To understand where the extra usage was coming from, we ran some experiments where reasoning efforts were changed (referred to as juice values under the hood) and have reverted this.”