Bug? Claude Fable Unexplainably Downgrades to Opus 4.8 on Basic Coding

rez0__ · x · 2026-07-03

Security researcher rez0 reported that in a completely fresh environment devoid of any hacking or cybersecurity context, the Claude Fable model still automatically downgraded to Opus 4.8 when asked to write basic code. This triggered criticism regarding Claude's flawed safety filtering logic, suggesting the model might be overly conservative in triggering downgrades without sufficient background context.

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