Anthropic's Claude Mythos model has achieved a score of 9.9 out of 16 on CMU's ExploitBench, significantly outperforming OpenAI's GPT-5.5, which scored 5.5. However, Claude Mythos is considerably more expensive to run, costing over 12 times more per execution than GPT-5.5. Separately, a specialized CLAUDE.md file has been developed to address CSS issues in Claude Code, improving its mobile compatibility and preventing common display problems. AI
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IMPACT Claude Mythos demonstrates superior performance on exploit detection, though its high cost may limit widespread adoption compared to GPT-5.5.
RANK_REASON Benchmark results for AI models are reported.