OpenAI launches Daybreak to compete with Anthropic’s Claude Mythos: Here is what it can do

OpenAI has introduced Daybreak, a cybersecurity initiative aimed at accelerating defensive capabilities through artificial intelligence. Led by CEO Sam Altman, the project leverages OpenAI’s latest GPT-5.5 models alongside its coding-focused AI system, Codex, to assist developers and security teams in identifying vulnerabilities in software systems. Daybreak offers three model options: a standard GPT-5.5 version with general safeguards, and a specialized **GPT-5.5 with Trusted Access for Cyber**, designed for verified professionals handling tasks like secure code reviews, malware analysis, and patch validation. OpenAI emphasizes that Trusted Access includes stricter identity verification and security controls for sensitive operations. The initiative aligns with growing industry interest in AI-powered cybersecurity tools, following reports that Anthropic’s Claude Mythos uncovered vulnerabilities in major software systems. Unlike Mythos, which remains unreleased due to security concerns, Daybreak is positioned as a proactive solution to integrate security into software development from the outset. OpenAI plans to collaborate with major tech firms, including Cisco, Intel, SentinelOne, and Snyk, to evaluate and refine the platform. The company argues that AI can significantly reduce the time required to detect and address vulnerabilities, helping organizations build software that is ‘resilient by design.’ Altman highlighted the increasing role of AI in cybersecurity, stating that the technology can play a critical role in protecting systems against evolving digital threats. Daybreak’s launch underscores OpenAI’s push into specialized AI applications beyond general-purpose models, marking a strategic move in the competitive AI security landscape.