OpenAI rolls out new model for cybersecurity teams a month after Anthropic's Mythos debut
- OpenAI introduces GPT‑5.5‑Cyber following uproar around Anthropic Mythos
- It's a modest upgrade focused on permissive cybersecurity tasks like vuln triage and malware analysis
- Access is limited to vetted teams in the Trusted Access for Cyber (TAC) program, unlike Anthropic’s more restricted Mythos Preview
OpenAI has introduced GPT-5.5-Cyber, an upgraded cybersecurity model looking to take some of the shine off Anthropic's Mythos Preview release.
Coming less than a month after the launch of GPT-5.4-Cyber, this is not a major upgrade by any means, and users should not expect many changes, OpenAI explained.
instead, users should expect a model trained to be more permissive when it comes to cybersecurity tasks, making it easier to use for things like vulnerability identification, triage, patch validation, and malware analysis.
Competing with Mythos
“GPT‑5.5‑Cyber lets a smaller set of partners study advanced workflows where specialized access behavior may matter,” OpenAI said in a blog post.
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