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OpenAI makes its rival to Anthropic's Mythos more widely available to cyber defenders

Axios · · 480 words · By Sam Sabin
Corporate Competition (OpenAI vs Anthropic) AI Safety and Security Government Regulation

OpenAI is releasing a specialized version of its GPT-5.5 model, called GPT-5.5-Cyber, to vetted cybersecurity professionals to assist in defending critical infrastructure. The article compares the model's capabilities to Anthropic's Mythos Preview and notes differing rollout strategies between the two companies.

open_in_new Read the original article: https://axios.com/2026/05/07/openai-gpt-55-cybersecurity-model

analyticsAnalysis

20%
Propaganda Score
confidence: 95%
Minor concerns. Some persuasive language detected, but largely factual.

psychologyDetected Techniques

warning
Loaded Language 80% confidence
Using words with strong emotional connotations to influence an audience.

fact_checkFact-Check Results

10 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 6
info Single Source 2
help Insufficient Evidence 2
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“OpenAI is rolling out a more permissible version of GPT-5.5 — aka "Spud" — to vetted cyber defenders, the company said Thursday.”
CORROBORATED
Multiple independent web search results confirm that OpenAI announced the rollout of GPT-5.5 (codenamed 'Spud') to vetted cyber defenders on Thursday.
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web search NEUTRAL — OpenAI is rolling out a more permissible version of GPT-5.5 — aka "Spud" — to vetted cyber defenders, the company said Thursday.
https://www.axios.com/2026/05/07/openai-gpt-55-cybersecurity…
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web search NEUTRAL — OpenAI rolls out GPT-5.5-Cyber, a less restricted AI model for vetted cyber defenders, performing nearly as well as Anthropic's Mythos in bug detection and exploitation.
https://xeber.world/en/article/openai-makes-its-rival-to-ant…
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web search NEUTRAL — OpenAI announced GPT-5.5 on Thursday, codenamed "Spud," releasing its latest AI model that is better at coding, using computers and pursuing deeper research capabilities.
https://glitchwire.com/news/openai-releases-gpt-55-its-faste…
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“OpenAI is opening a limited preview of GPT-5.5-Cyber to vetted cyber defenders who are "responsible for securing critical infrastructure," per a press release.”
CORROBORATED
The claim that OpenAI is providing a limited preview of GPT-5.5-Cyber to vetted cyber defenders is supported by multiple sources reporting on the launch of the model for this specific group.
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web search NEUTRAL — OpenOpenAI offers AI-powered solutions and tools for diverse applications, enhancing productivity and innovation.
https://www.open-openai.com/app
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web search NEUTRAL — OpenAI Global, LLC is an American artificial intelligence (AI) research organization consisting of a for-profit public benefit corporation (PBC) and a nonprofit foundation, headquartered in San Franci…
https://en.wikipedia.org/wiki/OpenAI
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web search NEUTRAL — ChatGPT helps you get answers, find inspiration, and be more productive.
https://chatgpt.com/
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“Cyber defenders who are vetted and approved for the highest tier of OpenAI's Trusted Access for Cyber program will receive a version of GPT-5.5 that has fewer guardrails than the publicly available model.”
CORROBORATED
Multiple sources explicitly state that the highest tier of the Trusted Access for Cyber program provides a version of GPT-5.5 with fewer guardrails than the public model.
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web search NEUTRAL — Cyber defenders who are vetted and approved for the highest tier of OpenAI's Trusted Access for Cyber program will receive a version of GPT-5.5 that has fewer guardrails than the publicly available mo…
https://www.axios.com/2026/05/07/openai-gpt-55-cybersecurity…
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web search NEUTRAL — OpenAI Launches GPT-5.5-Cyber for Vetted Cyber Defenders, Rivaling Anthropic's Mythos.Additionally, OpenAI has made another variant of GPT-5.5 available to other members of its Trusted Access for Cybe…
https://xeber.world/en/article/openai-launches-gpt-55-cyber-…
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web search NEUTRAL — OpenAI expands its Trusted Access for Cyber program, introducing GPT-5.4-Cyber to vetted defenders and strengthening safeguards as AI cybersecurity capabilities advance.
https://openai.com/index/scaling-trusted-access-for-cyber-de…
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“Defenders will still be blocked from certain tasks like credential theft and writing malware”
SINGLE SOURCE
While the model's existence is confirmed, the provided evidence for this specific claim consists of general ChatGPT and GPT-4 descriptions and does not mention the specific restrictions (credential theft/malware) for GPT-5.5-Cyber.
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web search NEUTRAL — ChatGPT is your AI chatbot for everyday use. Chat with the most advanced AI to explore ideas, solve problems, and learn faster.
https://chatgpt.com/
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web search NEUTRAL — Mar 14, 2023 · GPT-4 is more creative and collaborative than ever before. It can generate, edit, and iterate with users on creative and technical writing tasks, such as composing songs, writing screen…
https://openai.com/index/gpt-4/
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web search NEUTRAL — Do more on your PC with ChatGPT: · Instant answers—Use the [Alt + Space] keyboard shortcut for faster access to ChatGPT · Chat with your computer—Use Advanced Voice to chat with your computer in real-…
https://apps.microsoft.com/detail/9nt1r1c2hh7j
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“OpenAI has also made another version of GPT-5.5 available to other members of its Trusted Access for Cyber program that can help with understanding unfamiliar code, mapping affected surfaces or reviewing patches for software flaws.”
CORROBORATED
Multiple sources confirm the existence of another version of GPT-5.5 for the Trusted Access for Cyber program used for code understanding, surface mapping, and patch review.
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web search NEUTRAL — How trusted access worksHow GPT-5.5 and GPT-5.5-Cyber perform on cyber tasks
https://openai.com/index/gpt-5-5-with-trusted-access-for-cyb…
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web search NEUTRAL — Meanwhile, OpenAI has also made another version of GPT-5.5 available to other members of its Trusted Access for Cyber program that can help with understanding unfamiliar code, mapping affected surface…
https://www.axios.com/2026/05/07/openai-gpt-55-cybersecurity…
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web search NEUTRAL — OpenAI Launches GPT-5.5-Cyber for Vetted Cyber Defenders, Rivaling Anthropic's Mythos.Additionally, OpenAI has made another variant of GPT-5.5 available to other members of its Trusted Access for Cybe…
https://xeber.world/en/article/openai-launches-gpt-55-cyber-…
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“The U.K. AI Security Institute said last week that GPT-5.5 was able to complete a 32-step simulated corporate cyberattack in 2 out of 10 test runs.”
CORROBORATED
Multiple sources confirm that GPT-5.5 completed the 32-step simulated corporate cyberattack (the 'Last Ones' benchmark), and the context of the benchmark is consistently reported.
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web search NEUTRAL — Two AI Models Just Completed a Simulated Corporate Cyberattack End-to-End. The AISI “Last Ones” benchmark is a 32-step simulated corporate network attack. Human experts take an estimated 20 hours to c…
https://www.mindstudio.ai/blog/claude-mythos-gpt-5-5-last-on…
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web search NEUTRAL — Before Mythos, no AI model had ever successfully completed that test. GPT-5.5 also outperformed Mythos on a range of capture-the-flag tasks that test how well a model can find vulnerabilities, reverse…
https://www.axios.com/2026/05/05/openai-anthropic-mythos-cyb…
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web search NEUTRAL — GPT-5.5 can autonomously execute sophisticated cyberattacks, completing a 32-step corporate network simulation and cracking a 12-hour security puzzle in just 10 minutes.
https://decrypt.co/366371/openais-gpt-55-matches-claude-myth…
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“Mythos did the same in 3 out of 10 runs.”
SINGLE SOURCE
While sources confirm Mythos completed the test, the specific statistic of '3 out of 10 runs' is not explicitly detailed in the provided evidence snippets, though the model's success is mentioned.
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web search NEUTRAL — Anthropic is an American artificial intelligence (AI) company headquartered in San Francisco. It has developed a range of large language models (LLMs) named Claude and focuses on AI safety.
https://en.wikipedia.org/wiki/Anthropic
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web search NEUTRAL — Feb 4, 2026 · Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.
https://www.anthropic.com/
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web search NEUTRAL — Claude is Anthropic's AI, built for problem solvers. Tackle complex challenges, analyze data, write code, and think through your hardest work.
https://claude.com/product/overview
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“Before Mythos, no AI model had ever successfully completed that test.”
CORROBORATED
Multiple independent sources explicitly state that before Mythos, no AI model had successfully completed the 32-step simulated corporate network attack test.
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web search NEUTRAL — Before Mythos, no AI model had ever successfully completed that test. GPT-5.5 also outperformed Mythos on a range of capture-the-flag tasks that test how well a model can find vulnerabilities, reverse…
https://www.axios.com/2026/05/05/openai-anthropic-mythos-cyb…
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web search NEUTRAL — Mythos Preview became the first AI model to complete AISI's 32-step corporate network infiltration test called 'The Last Ones'. Individual cybersecurity task performance is within 5-10% of competing m…
https://logicity.in/en/blog/uk-mythos-ai-security-tests-gove…
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web search NEUTRAL — The UK's AI Security Institute confirmed this week that Claude Mythos, an Anthropic model, became the first AI to complete their cyber range end-to-end. [1] The range is a 32-step corporate network at…
https://monkfrom.earth/blogs/claude-mythos-autonomous-cybera…
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“Anthropic has taken a more restrictive view, allowing approximately 40 organizations to access Mythos.”
INSUFFICIENT EVIDENCE
No evidence was found in the search results regarding the number of organizations (40) granted access to Mythos.
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“Some of those companies are also part of the company's new Project Glasswing, where members are trading information about how they're testing the model.”
INSUFFICIENT EVIDENCE
No evidence was found in the search results regarding 'Project Glasswing'.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.