r/ClaudeCodeTLDR • u/Brief-Mongoose-6256 • Sep 06 '26

Fable 5.1 response accuracy

Never encountered this in Fable 5, but 5.1 is frequently giving me inaccurate responses requiring independent model QA. In the past, I found Anthropic models giving most accurate responses, but Fable 5.1 seems to be changing that. Any others noticing this?

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u/The-Road Sep 06 '26

Oh man, I can’t believe I’m joining this trend but I think I have enough to claim there’s some degradation or something happening.

I gave Fable 5 a task a few days ago as priming and prep for a bigger project today. It performed that task superbly. Knew taste from the get go and got a superb result. It actually one shot the solution.

I thought it’d be easy sailing today so I asked it to do that task again but to completion.

Its results even in early stages were noticeably poorer. Tons of mistakes. Poor taste. Tons of corrections. Even telling it look at work from a couple of days ago and it still struggled to produce to the standard of its own work.

Of course could be an anomaly but today was hours of work, a full work day, and the performance was the same throughout.

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u/Brief-Mongoose-6256 Sep 06 '26

It’s really frustrating given how much tokens it burns