ModelsThe Decoder· Jun 23, 2026
OpenAI Unveils GPT-5.5-Cyber Model Claimed to Outperform Anthropic Mythos
OpenAI is broadening its Daybreak cybersecurity program through the release of the GPT-5.5-Cyber model along with an updated plugin. The model is reported to exceed Anthropic's Mythos performance on relevant benchmarks. The initiative now prioritizes automated remediation of issues via expanded industry and government partnerships.
Key points
- →Daybreak initiative expands with GPT-5.5-Cyber model and Codex Security plugin
- →New model outperforms Anthropic Mythos on cybersecurity benchmarks
- →Shift in focus toward automatic vulnerability patching
- →Partnerships include over 25 security firms and multiple governments
Mentioned
OpenAIGPT-5.5-CyberAnthropicMythosCodex Security
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