OpenAI reveals Daybreak, its attempt to topple Anthropic Mythos

Date:
Tue, 12 May 2026 14:30:12 +0000

Description:
Daybreak looks to rival Anthropic's Mythos as a high-severity vulnerability detection tool, while also securing software from the start.

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter OpenAI has unveiled Daybreak, its latest security project It seeks to rival Anthropic's Mythos in detecting and patching high-severity vulnerabilties Daybreak will also help companies build software more securely from the start OpenAI has unveiled Daybreak, its answer to Anthropics Mythos and Project Glasswing, sparking a potential cybersecurity arms race between the two companies.

Daybreak combines the intelligence of OpenAI models, the extensibility of Codex as an agentic harness, and our partners across the security flywheel to help make the world safer for everyone, the announcement said. The project looks to work with OpenAIs industry and government partners by securing software at the very beginning of the development process, creating a more robust base that, in time, will scale the effectiveness of cyber defense. Latest Videos From You may like OpenAI reveals its Mythos rival designed for cybersecurity pros Project Glasswing wants to use AI to prevent AI cyberattacks OpenAI rolls out new model for cybersecurity teams a month after Anthropic's Mythos debut Daybreak to build software securely from the start
In the blog post, OpenAI sums up the project in a single sentence: The goal
is simple: accelerate cyber defenders and continuously secure software.

Daybreak will allow organizations to apply OpenAIs Codex Security to their
own repository using an agentic harness, where it will seek out, analyze, and patch attack paths and high-impact code.

High-priority vulnerabilities can be analyzed and validated in a secure, isolated environment, so teams can prioritize real, reproducible issues over noisy alerts. Codex Security will also allow teams to automate detection and response, increasing efficiency and securing critical vulnerabilities faster.

Daybreak therefore seeks to delegate the rote work of identifying and analyzing to AI, and to return the evidence-backed results of vulnerabilities to human teams. Where Daybreak differs in its approach compared to Mythos is in building software securely from the start and constantly monitoring for vulnerabilities, compared to Mythos focus of detecting and mitigating high-severity vulnerabilities at scale. Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed! Contact me
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Daybreak includes three models; GPT-5.5, as the default for general-purpose work; GPT-5.5 with Trusted Access for Cyber, to be used in defensive security workflows; and GPT-5.5-Cyber, for specialized workflows including red teaming and pen testing.

Dane Knecht, CTO at Cloudflare, said, Were excited about the potential of OpenAIs cyber capabilities to bring stronger reasoning and more agentic execution into security workflows. Its a big step forward for teams to be
able to leverage frontier models not only to accelerate velocity, but also to improve their security posture. Follow TechRadar on Google News and add us as a preferred source to get our expert news, reviews, and opinion in your feeds.



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