Anthropic Safety Guardrails Misfire, Blocking Fable 5.1 Tests

During v3 testing of Fable 5.1, Anthropic's safety guardrails mistakenly rejected many requests as "reverse engineering." Despite Anthropic's attempts to lift the restrictions before release, the issue was not resolved in time.

2026-09-02 ~ 2026-09-02 · 2 related posts

• Anthropic Safety Filters Block Fable 5.1 Testing Over 'Reverse Engineering' False Positives — GregKamradt · 2026-09-02
• Anthropic Safety Guard Misclassifications Halted Fable Testing — GregKamradt · 2026-09-02