restricted-access

OpenAI is restricting access to a new AI model with advanced cybersecurity capabilities to a small group of companies, mirroring Anthropic's decision to limit distribution of its Mythos Preview model. OpenAI's move builds on its February launch of the Trusted Access for Cyber pilot program following GPT-5.3-Codex, offering $10 million in API credits to participants.

Anthropic is rolling out its Mythos Preview model only to a handpicked group of 40 tech and cybersecurity companies, withholding public release due to the model's sophisticated ability to find tens of thousands of vulnerabilities and autonomously create working exploits. The model found bugs in every major operating system and web browser during testing, including vulnerabilities decades old and undetected by human security researchers.