OpenAI launches Daybreak to combat cyber threats

Dive Brief

The cybersecurity initiative uses AI to find and patch vulnerabilities. Unlike Anthropic’s Mythos, Daybreak is widely available.

Published May 12, 2026

Dive Brief:

• OpenAI on Monday launched a new cybersecurity initiative called Daybreak, which uses its large language models, Codex’s agentic capabilities and security partners to root out risk and call defense into action. The rollout is OpenAI’s answer to Anthropic’s Mythos model which debuted to limited preview last month and has highlighted weak security spots in software across various industries.
• Like with Anthropic’s Project Glasswing, which sought tech vendors to support Mythos, OpenAI will work with industry and government partners to deploy cyber-capable models that are meant to build autonomous cyber defense capabilities into software from the start. Cloudflare, Cisco, CrowdStrike, Oracle and Zscaler are among a group of companies already using the technology, OpenAI said. Unlike Mythos, Daybreak is publicly available, and companies can ...

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