为下一代网络防御打造可信访问Trusted access for the next era of cyber defense
OpenAI推出GPT-5.4-Cyber模型，专门针对网络安全防御场景进行微调，以应对Claude Mythos等AI驱动的网络威胁。这表明行业正转向专用AI模型赋能主动防御，构建‘可信访问’机制来识别、阻断和响应自动化攻击。
Simon Willison
14th April 2026 - Link Blog
Trusted access for the next era of cyber defense (via) OpenAI's answer to Claude Mythos appears to be a new model called GPT-5.4-Cyber:
In preparation for increasingly more capable models from OpenAI over the next few months, we are fine-tuning our models specifically to enable defensive cybersecurity use cases, starting today with a variant of GPT‑5.4 trained to be cyber-permissive: GPT‑5.4‑Cyber.
They're also extending a program they launched in February (which I had missed) called Trusted Access for Cyber, where users can verify their identity (via a photo of a government-issued ID processed by Persona) to gain "reduced friction" access to OpenAI's models for cybersecurity work.
Honestly, this OpenAI announcement is difficult to follow. Unsurprisingly they don't mention Anthropic at all, but much of the piece emphasizes their many years of existing cybersecurity work and their goal to "democratize access" to these tools, hence the emphasis on that self-service verification flow from February.
If you want access to their best security tools you still need to go through an extra Google Form application process though, which doesn't feel particularly different to me from Anthropic's Project Glasswing.
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