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Startup Launch
May 1, 2026

After dissing Anthropic for limiting Mythos, OpenAI restricts access to Cyber, too

OpenAI is rolling out its new cybersecurity testing tool, GPT-5.5 Cyber.

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Impact: 10/10

In 10 seconds

What to know first

  • OpenAI is launching its new cybersecurity testing tool, GPT-5.5 Cyber, but will initially restrict access to "critical cyber defenders." This move comes after OpenAI previously criticized Anthropic for similar limitations on its Mythos tool.
  • Restricting advanced AI cybersecurity tools to a select group could impact the broader cybersecurity landscape and raise questions about equitable access to powerful defensive technologies.

Why it matters

Restricting advanced AI cybersecurity tools to a select group could impact the broader cybersecurity landscape and raise questions about equitable access to powerful defensive technologies.

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Summary

OpenAI is launching its new cybersecurity testing tool, GPT-5.5 Cyber, but will initially restrict access to "critical cyber defenders." This move comes after OpenAI previously criticized Anthropic for similar limitations on its Mythos tool.

What happened

OpenAI is rolling out its new cybersecurity testing tool, GPT-5.5 Cyber.

Key details

Access to GPT-5.5 Cyber will initially be limited to "critical cyber defenders." This decision is notable as OpenAI had previously criticized Anthropic for implementing similar access restrictions for its Mythos tool.

What to watch

The implications of this restricted rollout for the broader cybersecurity community and the competitive dynamics between major AI developers like OpenAI and Anthropic. It also raises questions about the balance between responsible deployment of powerful AI tools and ensuring broad access for defensive purposes.

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