The myth of Claude Mythos crumbles as small open models hunt the same cybersecurity bugs Anthropic showcased

THE DECODER / 4/18/2026

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Key Points

  • Anthropic has promoted the “Claude Mythos” cybersecurity model by claiming it can analyze vulnerabilities in ways competitors cannot match.
  • Two new studies indicate that smaller, openly available models can reproduce much of the vulnerability analysis shown by Anthropic.
  • The findings challenge the idea that only large proprietary models can perform top-tier cybersecurity reasoning and analysis.
  • The article frames this as evidence that open models may close the gap for practical vulnerability discovery workflows.

Anthropic has kept its Claude Mythos cybersecurity model on a short leash, pointing to capabilities it says no rival can match. But two new studies suggest that even small, openly available models can reproduce most of the vulnerability analyses Anthropic has put on display.

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