Epoch AI released a report evaluating the Claude Mythos series models, noting that Mythos Preview is approximately seven months ahead of the linear trend in exploit development and about three months ahead of OpenAI’s GPT-5.5. The report suggests that Mythos’s advantage in vulnerability discovery has been overstated, as its performance in curl tests did not surpass traditional tools, and the surge in CVE reports from April to May was primarily driven by Anthropic’s $100 million API credit allocation to Glasswing. Mythos’s true strengths lie in its low false positive rate and precise severity classification.
Epoch AI Report: Claude Mythos Leads in Exploit Development but Overestimates Its Advantage in Vulnerability Discovery
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Summary
Epoch AI’s latest weekly market report highlights Claude Mythos as a top performer in exploit development, leading linear trends by seven months and outpacing GPT-5.5 by three. However, the daily market report notes that Mythos underperforms in vulnerability discovery, failing to surpass traditional tools in curl tests. A $100 million API quota from Anthropic to Glasswing drove a surge in CVE reports during April and May. Mythos excels in low false positive rates and precise risk classification.
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