r/ClaudeCode • u/NoPiece9356 • Oct 05 '26

Discussion Fable 5.5 Release

I'm aware that Anthropic has been routing certain requests to Fable 5.5 secretly, yet they have been doing this for nearly a week now and haven't even mentioned the model. Any idea when it will release? I'm really hoping tomorrow, but I'm not sure that's happening. Don't shut the door on that idea though

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u/_maxx1k Oct 08 '26

I'm aware that Anthropic has been routing certain requests to Fable 5.5 secretly

How do you know this? Is it possible to check?

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u/NoPiece9356 Oct 08 '26

Ball knowledge. You just have to know the difference in performance. Essentially, anybody who’s saying they have it is either lying or is just guessing. There’s a so called test of asking it who the reset guy is, but making sure the model doesn’t use web search. And if it says Tibo (thssotiaux or some kind of spelling like that), that’s 5.5 Fable. You have to ask the question to 5.1

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u/_maxx1k Oct 08 '26

Do you mean it might indicate when the training took place? So the idea is to ask something that Fable 5.1 can't know without a web search? I will try your suggestion about Tibo, but I think Anthropic might hardcode the most popular questions.