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Users report Fable 5 performance decline weeks after launch

Waterluvian reports immediate performance degradation versus Friday evening

A commenter describes noticing something wrong with Fable 5 compared to Friday evening, citing a specific incident where the model duplicated a method it was asked to delete, then acknowledged the error. The user also notes increased "thinking" time for previously simple tasks.

Waterluvian reports immediate performance degradation versus Friday evening
twitter.com

“I have no hard data but I have a strong feeling this morning that something's wrong with Fable 5 compared to Friday evening.”

Waterluvian

Waterluvian Fable 5 userjotato gpt-5.6-luna usermlmonkey Frontier model researchertheplumber Claude userrcr-anti Claude Code tracker

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