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Third-party tests show that after returning, the Fable 5 model's performance dropped significantly on the BridgeBench benchmark. Debugging score fell from 86.2 to 25.9, Refactoring from 73.6 to 38.4, Hallucination from 75.9 to 61.7. It is speculated that the new safety guardrails caused many tasks to be handed off to Opus 4.8.