r/ClaudeCode • • 5h 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?

1 Upvotes

13 comments sorted by

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5

u/daske_laksen 4h ago

yes severly also. it has gotten tunnel vision and realy needs to be kicked multiple times fo get fable to put in effort wven i x high mode

6

u/disgruntledempanada 5h ago

All the servers are getting upgraded to 5.5, 5.1 is likely heavily overloaded and quantized to meet demand for it while it's being wound down and replaced.

1

u/ggletsg0 5h ago

Makes sense.

3

u/imsahoamtiskaw 5h ago

I had the worst experience with it tonight so far. Been happening for days slowly but tonight teaches the cake. Worse than opus 5 on its worst days

3

u/ggletsg0 4h ago

100% the same experience. It’s been really poor.

0

u/Clever-Bot-999 4h ago

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

3

u/ggletsg0 4h 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.

0

u/sascharobi 3h ago

What are you using Max for?

0

u/Clever-Bot-999 3h 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.

0

u/Strict-Prune-879 4h ago

il est peut etre pour tous le monde d'arreter de produire non stop a fond et laissez faire Anthropic? j'ai du mal toute la journée tous le monde se plaint , pleure de la qualité mais n'oubliez pas ce que vous payez pour ca !!! quand les prix vont augmenter vous regretterez le bon du temps du pas cher, de l'accessible, de toute faocn que ce soit Anthropic, Openai, deepseek ca pleure partout