OpenAI has a new AI model called GPT 5.4-Cyber, but it’s not coming to your ChatGPT. At least not yet. Instead, the company is doing a limited release to verified cybersecurity testers, according to a blog post shared on Tuesday. These experts will put the model through its paces to identify gaps and potential jailbreaks before the model is released to the wider public. 

OpenAI uses the feedback from these testers for “understanding the differentiated benefits and risks of specific models, improving resilience to jailbreaks and other adversarial attacks, and improving defensive capabilities — while mitigating harms,” the company said.

The model release is part of a ramped-up version of OpenAI’s Trusted Access for Cyber program, which allows verified cybersecurity professionals and organizations to get early access to models for defense and prevention work. This is a common cybersecurity practice, one made all the more valuable and necessary because of AI. Cyber attackers and defenders alike are armed with AI tools, making cybersecurity an increasingly AI versus AI landscape. 

When it comes to securing specific AI models, the companies that make them are convinced the latest models are so dangerously powerful that they require extra security. That was the logic behind Anthropic’s Project Glasswing, announced last week. Anthropic’s next-generation model, Claude Mythos Preview, is apparently so powerful that the company says it has already found security vulnerabilities “in every major operating system and web browser,” according to a blog post. 

Unlike Claude Mythos Preview, which Anthropic said is an entirely new model, OpenAI’s GPT-5.4-Cyber is a fine-tuned version of its existing GPT-5.4 large language model. It’s been adjusted to focus specifically on cybersecurity and has lower guardrails for security tasks. Essentially, GPT-5.4-Cyber will be less likely to refuse to perform a risky cybersecurity-related task than the normal versions of GPT-5.4. That’s so experts can see if and how it could be weaponized by bad actors.

The timing of GPT 5.4-Cyber likely isn’t coincidental. This is the latest chapter in the ongoing battle for dominance between OpenAI and Anthropic. The companies have been clashing all year to prove their AI models are the most capable, particularly going after government and enterprise contracts. Anthropic kicked off the race with its Claude Cowork and Code tools, which knocked legacy tech companies (and their stock prices) off balance with their agentic abilities. OpenAI was quick to follow with improvements to its Codex coding platform and models, killing off its AI video app Sora to refocus the company’s resources.