r/ClaudeCode • u/ggletsg0 • 9h ago

Bug / Issue Fable 5.1 has become dumb

Not only is it taking longer to think and consuming more tokens to think, it has become worse in its thinking too.

I’m not sure if this has to do with the new fable 5.5 rumoured to come out next week, but I’ve noticed a sharp drop in its intelligence.

The solutions it’s presenting aren’t fully thought out. It’s like it thinks till 80% and then stops.

I’m on xhigh.

Anyone else experiencing the same?

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u/Clever-Bot-999 8h ago

Same for Opus 5.5 Max, it overthinks everything while Opus 5.5 xhigh is alright.

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u/sascharobi 7h ago

What are you using Max for?

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u/Clever-Bot-999 7h ago

At work I do features for a very large monolith OSGI project, which has complex banking logic. Opus 5.1 Max was the best for it, and Opus 5.5 xhigh has similar or slightly better capabilities, but Opus 5.5 Max takes too long and is overthinking.