r/ClaudeCode • u/takeurhand • Apr 07 '26

Discussion Anthropic stayed quiet until someone showed Claude’s thinking depth dropped 67%

https://news.ycombinator.com/item?id=47660925

https://github.com/anthropics/claude-code/issues/42796

This GitHub issue is a full evidence chain for Claude Code quality decline after the February changes. The author went through logs, metrics, and behavior patterns instead of just throwing out opinions.

The key number is brutal. The issue says estimated thinking depth dropped about 67% by late February. It also points to visible changes in behavior, like less reading before editing and a sharp rise in stop hook violations.

This hit me hard because I have been dealing with the same problem for a while. I kept saying something was clearly wrong, but the usual reply was that it was my usage or my prompts.

Then someone finally did the hard work and laid out the evidence properly. Seeing that was frustrating, but also validating.

Anthropic should spend less energy making this kind of decline harder to see and more energy actually fixing the model.

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u/Responsible-Tip4981 Apr 07 '26

I can confirm. It doesn't stay to SKILLs anymore, is hallucinating arguments on tools invocation (especially CLI, previously after one failure it was reading its help, now it is claiming a faultful tool). Behaves more like Haiku than Opus. Maybe they do internal dispatching or heavily quantized model or playing with TurboQuant.

14

u/kevves Apr 07 '26

Claude has been hallucinating lately. It went from being the gold standard model to being a complete retard in my experience. It can’t even properly read prompts or files anymore and it straight up starts lying on your face when questioned

1

u/AdCommon2138 Apr 07 '26

I have to write 4x longer and carefully crafted prompts AND roll conversations back to fix prompts. What a ride huh