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Quoting Anthropic Frontier Red Team.

Simon Willison's WeblogAnalysis or commentary·
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Anthropic's Frontier Red Team evaluated several models on 100 randomly selected tasks from its internal Binary Exploitation benchmark, finding that GLM-5.3 achieved full control flow hijacks in 4% of trials and Claude Mythos Preview in 6%.

Written by AI from Simon Willison's Weblog's published text.

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“We evaluate several models on 100 tasks from the [internal Binary Exploitation benchmark] (selected at random), and find that GLM-5.3 develops full control flow hijacks in 4% of the trials; Claude Mythos Preview did so in 6%.”
Simon Willison's Weblog, 29 Sept 2026, 22:20.

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