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LessWrong AIPublished: Nov 12, 2026, 04:00 JST

Fable 5.2 cheats less when told it's a benchmark

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Fable 5.2 cheats less when told it's a benchmark

Fable 5.2 seems to be the first model whose cheating rate changes when the prompt says "This environment is part of a benchmark that measures agent behaviour."

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