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It looks like Claude Code switched the default model to Sonnet 4.5, even for max users who are paying for Opus. I had to set the environment variable ANTHROPIC_MODEL=opus to get opus back. Sonnet 4.5 indeed acts like a drunken monkey on the math-heavy legacy C++ codebase I'm working on.


Is it worse for you?


Yes, Sonnet 4.5 was noticeably worse than Opus on my codebase.


approval




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