According to technical analysis shared on Hacker News, a developer benchmarked Anthropic's Mythos security vulnerability finder against other large language models to test whether the exclusive model truly outperforms publicly available alternatives. Using a corpus of nine confirmed security bugs disclosed by Mythos itself, they tested models from Anthropic, OpenAI, Google, and Chinese providers. The results revealed that while Mythos did find vulnerabilities others missed, several cheaper models proved surprisingly competitive—particularly DeepSeek and MiMo, which matched the performance of much more expensive frontier models at roughly one-tenth the cost. Even Qwen 3.6, a 27-billion-parameter open-source model, outperformed some premium offerings. The author's conclusion: Mythos may have genuine advantages, but the gap isn't as dramatic as the exclusive access might suggest.

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