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GPT-5.5

OpenAI model; matched Mythos on the 32-step attack benchmark; cited by Anthropic in June 2026 export-control dispute.

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#1312 Jun
#96 May

Cleared AISI's 32-step autonomous attack chain benchmark, becoming second model to do so

AI: Jobs, Power & Money: GPT-5.5 clears 32-step attack chain; two models in five days