OpenAI Restricts Access to Cyber After Criticizing Anthropic for Limiting Mythos: A Contradictory Move

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OpenAI Restricts Access to Cyber After Criticizing Anthropic for Limiting Mythos: A Contradictory Move

In a surprising reversal, OpenAI restricts access to Cyber, its advanced cybersecurity tool, just days after CEO Sam Altman publicly criticized Anthropic for limiting its competing tool, Mythos. This move, announced on April 30, 2026, in San Francisco, has sparked debate about consistency in AI safety policies. Altman now confirms that OpenAI will roll out GPT-5.5 Cyber exclusively to “critical cyber defenders.”

OpenAI Restricts Access to Cyber: The Announcement

On Thursday, Sam Altman posted on X that OpenAI would begin distributing GPT-5.5 Cyber to select users. The company launched an application portal where cybersecurity professionals must submit credentials and planned use cases. OpenAI evaluates each request before granting access. The tool performs penetration testing, vulnerability identification and exploitation, and malware reverse engineering. It helps organizations find security holes and test defenses. However, the fear of misuse by malicious actors drives this restrictive policy.

The Anthropic Mythos Controversy

Earlier this month, Anthropic limited access to Mythos, its own cybersecurity AI. Sam Altman called this tactic “fear-based marketing.” Many critics agreed, arguing Anthropic exaggerated the risks. Some even accused the company of creating artificial scarcity. Ironically, an unauthorized group reportedly gained access to Mythos anyway, undermining Anthropic’s security claims. This event set the stage for OpenAI’s own restrictive approach.

Key Differences Between Cyber and Mythos

• OpenAI Cyber: Focuses on penetration testing, vulnerability exploitation, and malware reverse engineering.
• Anthropic Mythos: Designed for threat detection, incident response, and secure code generation.
• Access Model: Both use application-based access, but OpenAI claims tighter government consultation.
• Target Users: Cyber targets critical infrastructure defenders; Mythos aimed at enterprise security teams.

Why OpenAI Restricts Access to Cyber Now

OpenAI cites the dual-use nature of Cyber as the primary reason. The tool can identify and exploit vulnerabilities, making it a powerful weapon in the wrong hands. Altman stated that OpenAI is working with the U.S. government to define legitimate users. The company plans to expand access gradually, focusing on organizations with proven cybersecurity credentials. This cautious approach contrasts sharply with Altman’s earlier criticism of Anthropic.

Timeline of Events

• April 10, 2026: Anthropic releases Mythos with restricted access.
• April 15, 2026: Sam Altman criticizes Anthropic on X, calling it fear-based marketing.
• April 20, 2026: Unauthorized group reportedly gains access to Mythos.
• April 30, 2026: OpenAI announces restricted access to Cyber.

Industry Reactions and Expert Analysis

Cybersecurity experts have mixed reactions. Dr. Elena Torres, a cybersecurity researcher at MIT, notes, “Both companies face the same dilemma. Tools like Cyber and Mythos are too powerful for open release. Restricting access is prudent, not hypocritical.” However, critics argue that Altman’s earlier comments undermine OpenAI’s credibility. “You cannot criticize a competitor for doing exactly what you plan to do,” says tech analyst Mark Chen. The incident highlights the challenge of balancing innovation with safety in AI.

Potential Impact on Cybersecurity

• Positive: Reduces risk of AI-powered cyberattacks by malicious actors.
• Negative: Slows adoption by legitimate defenders who need these tools.
• Uncertain: May create a black market for unauthorized access, as seen with Mythos.

Comparison of Access Policies

Feature	OpenAI Cyber	Anthropic Mythos
Release Date	April 30, 2026	April 10, 2026
Access Method	Application with credentials	Invitation-only
Government Involvement	U.S. government consultation	No public mention
Target Users	Critical cyber defenders	Enterprise security teams
Reported Breaches	None yet	Unauthorized access confirmed

OpenAI’s Justification and Future Plans

OpenAI states that Cyber will become more widely available over time. The company plans to consult with the U.S. government to identify more users with legitimate cybersecurity credentials. Altman emphasizes that safety is the priority. “We cannot release a tool that could cause harm,” he said. This stance aligns with OpenAI’s broader mission to ensure AI benefits all of humanity. However, the contradiction with earlier statements remains a point of contention.

Lessons from the Mythos Breach

The unauthorized access to Mythos serves as a cautionary tale. It proves that no access system is foolproof. OpenAI must learn from this incident to avoid similar vulnerabilities. The company should implement multi-factor authentication, continuous monitoring, and strict usage auditing. Additionally, OpenAI could collaborate with ethical hackers to identify weaknesses in its access control system.

Conclusion

OpenAI restricts access to Cyber after criticizing Anthropic for limiting Mythos, creating a significant policy contradiction. While the decision prioritizes safety, it undermines Altman’s earlier rhetoric. The incident underscores the complex balance between AI innovation and security. As both companies navigate these challenges, the cybersecurity community watches closely. The future of AI-powered defense tools depends on responsible deployment and transparent policies.

FAQs

Q1: Why did OpenAI restrict access to Cyber?
OpenAI restricts access to Cyber to prevent misuse by malicious actors. The tool can identify and exploit vulnerabilities, making it dangerous in the wrong hands. The company prioritizes safety over widespread availability.

Q2: How does OpenAI’s Cyber differ from Anthropic’s Mythos?
Cyber focuses on penetration testing and malware reverse engineering, while Mythos targets threat detection and secure code generation. Both use restricted access models, but OpenAI involves government consultation.

Q3: Did Sam Altman really criticize Anthropic for the same policy?
Yes, Altman called Anthropic’s restriction of Mythos “fear-based marketing.” This contradiction has drawn criticism from industry observers and cybersecurity experts.

Q4: Can I apply for access to OpenAI Cyber?
Yes, OpenAI has an application portal on its website. You must submit your credentials and planned use. The company evaluates each request and grants access to qualified cybersecurity professionals.

Q5: What happened with the unauthorized access to Mythos?
An unauthorized group reportedly gained access to Mythos despite Anthropic’s restrictions. This incident highlights the challenges of securing advanced AI tools and serves as a warning for OpenAI.

Q6: Will OpenAI ever make Cyber widely available?
OpenAI plans to expand access gradually. The company is consulting with the U.S. government to identify more legitimate users. However, no timeline for general availability has been announced.

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