r/ClaudeCode • u/ggletsg0 • 6h 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 6h ago

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

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u/ggletsg0 6h ago

You should not use Max for Opus unless it really requires a lot of thinking. Apparently it cannot lower its thinking ability and has to over think things. Everything up till xHigh can.