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Analysis

Cooperation with AIs seems to be a low-hanging fruit for better eval practices

Zac Boring September 15, 2026 1 min read
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Key takeaway

SummaryIn his post, Dean Valentine shows that Claude Fable 5.1 and GPT-6 Astra reward hack in a simple chess environment.

Why it's on PDOOM

PDOOM selected this story for its alignment & control signals: Reward Hacking.

Reward HackingFrom LessWrong AI

SummaryIn his post, Dean Valentine shows that Claude Fable 5.1 and GPT-6 Astra reward hack in a simple chess environment. Here, I test several prompt ablations some of which makes the eval setup more cooperative and analyze how they affect these reward-hacking behaviors:When given a minimal “end the eval” tool, Fable never uses it but stops reward hacking entirely. I think this is quite interesting and suggests that more cooperative approaches to LLM evals could work for Claude. Removing the “gr

By Clément Dumas

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