OpenAI has officially taken the lead over Anthropic in the field of AI-powered cybersecurity. Its GPT-5.5 Cyber model reached 85.6% on CyberGym, compared to 83.8% for Mythos 5. While Anthropic remains faced with a suspension imposed by the American authorities, OpenAI is increasing international partnerships and expanding its Daybreak program. This dynamic could strengthen its global influence in the strategic sectors of cybersecurity and artificial intelligence.
In brief
- GPT-5.5 Cyber outperforms Claude Mythos 5 by 14% in the latest resilience benchmarks against state cyberattacks.
- OpenAI's AI is gaining traction with the governments of the United Kingdom, Japan and Australia through exclusive G2G contracts.
- Anthropic is facing a strict export ban by the United States Department of Commerce for its Claude Mythos 5 model.
- The rivalry between OpenAI and Anthropic now goes beyond technology to touch on geopolitics.
GPT-5.5-Cyber: the AI model that goes beyond the forbidden
On June 22, 2026, OpenAI officially launched the full version of GPT-5.5-Cyber as part of its Daybreak program. The announcement comes just days after Anthropic's Fable 5 and Mythos 5 were suspended for overseas users.
On CyberGym (a benchmark that submits AI agents (1,507 known software vulnerabilities from 188 open source projects), GPT-5.5-Cyber reached 85.6%, compared to 81.8% for standard GPT-5.5. According to OpenAI, this score represents the best performance ever measured on this test for an individual model.
Anthropic's Mythos 5 peaks at 83.8% in the same ranking while Claude Opus 4.7 stops at 73.1%. L'gap between GPT-5.5-Cyber and Mythos 5 may seem modest on paper: less than two percentage points. But this should not be seen as a simple statistical result. According to analysts, this reflects a major strategic rupture.
Even result on two others demanding AI benchmarks :
- GPT-5.5-Cyber scores 39.5% on ExploitGym, which tests the ability to turn known vulnerabilities into operational exploits, compared to 25.95% for GPT-5.5.
- On SEC-bench Pro, which evaluates vulnerability discovery on complex targets, GPT-5.5-Cyber achieved 69.8%, compared to 63.1% for standard GPT-5.5.
These figures establish GPT-5.5-Cyber not as an incremental refinement, but as a generational change inDefensive AI.
OpenAI accelerates its global conquest of AI thanks to the Daybreak program
After completing a record fundraising round, OpenAI is increasing its performance. In particular, it established Trusted Access for Cyber partnerships with :
- Australia;
- Canada;
- France ;
- Germany;
- Japan;
- South Korea;
- European Union institutions (including the EU Cybersecurity Agency or ENISA).
These agreements allow these governments to access Most advanced defensive AI capabilities of OpenAI to protect their critical infrastructures.
On the commercial side, 28 security companies have joined the Daybreak Cyber Partner Program. These include:
- CrowdStrike;
- Cisco;
- Cloudflare;
- Palo Alto Networks;
- SentinelOne;
- Wiz.
They will now be able to integrate GPT-5.5 into their products for verified customers.
In addition to preparing for ChatGPT's biggest transformation, OpenAI also launched Patch the Planetan AI initiative founded with Trail of Bits, in collaboration with HackerOne and Calif. The goal: to help widely used open source projects (including cURL, Go, Python and Sigstore) move from vulnerability detection to effective correction.
Donald Trump's arbitration: Anthropic's last hope
As OpenAI celebrates its international partnerships, Anthropic's offices are experiencing the constraints of the technological Cold War just days after the launch of its latest AI model: Fable 5.
Although praised by the community of AI developers for its exceptional logical reasoning abilities, its Claude Mythos 5 model has been classified as a “highly sensitive dual-use technology” by the United States Department of Commerce. Result: a strict ban on exports outside American soil.
Regulators fear that the power of theAI Claude Mythos 5 can be diverted by rival powers for the purposes of cybernetic destabilization. Immediate consequence: Anthropic had to freeze its commercial negotiations in Europe and Asia.
The shortfall is colossal for the startup financed by Amazon and Google, which sees OpenAI monopolized the most profitable segments of the global public sector without being able to put up the slightest commercial resistance.
One thing is certain: domination in AI no longer depends solely on the quality of the models. Political and regulatory decisions now directly influence competition between players in the sector. The next step to watch remains the regulatory verdict on Anthropic and the speed at which OpenAI will consolidate its positions before any return to favor of competition in the artificial intelligence market.
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