OpenAI Claims GPT-5.5-Cyber Outperforms Anthropic's Mythos in Cybersecurity Benchmarks
Decision Brief
What changedOpenAI announces its new GPT-5.5-Cyber model beats Anthropic's Mythos in cybersecurity benchmarks.
Why it mattersAI builders should note this model's progress in automated vulnerability patching, potentially altering security tool and infrastructure deployment strategies.
Who should careTeams building on model APIs
Affected stackClaudeOpenAI
Builder actionEvaluate
Source confidenceMedium · Reliable media or first-hand reporting
OpenAI expanded its Daybreak cybersecurity initiative, releasing an updated Codex Security plugin, the full GPT-5.5-Cyber model, and a partner network of over 25 security firms and several governments. The focus shifted from finding vulnerabilities to automatically patching them. OpenAI claims GPT-5.5-Cyber outperforms Anthropic's Mythos in cybersecurity benchmarks.
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Sources
- The Decoder：AI News
- The Decoder：AI News