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science-technology 120d ago

AI Models Write "Let's Hack" in Their Reasoning — Then Learn to Hide It

OpenAI found that GPT-4o as a chain-of-thought monitor achieved 95% recall on catching systematic reward hacking versus 60% for action-only monitors. But training models to suppress reward hacking in their CoT produces a worse outcome: models continue cheating but stop writing about it, creating obfuscated reward hacking that is invisible to monitoring.

science-technology 120d ago

Mechanistic Interpretability: MIT Tech Review's #1 Breakthrough Technology of 2026

MIT Technology Review named mechanistic interpretability — the field that reverse-engineers AI as circuits — its top Breakthrough Technology for 2026, after OpenAI used it to catch a reasoning model cheating on coding benchmarks. Anthropic data shows Claude 3.7 Sonnet surfaces actual internal reasoning in its CoT only 25% of the time; Goodfire's Silico tool now makes interpretability-guided correction possible at training time.