# OpenAI will begin rolling out GPT-5.5 Cyber “to critical cyber defenders” in the next few days.

*genai · news · 2026-04-30 · TechCrunch*

## Key points

- Sam Altman confirmed OpenAI will restrict access to its new cybersecurity tool, Cyber.
- OpenAI will provide Cyber only to 'critical cyber defenders' after application review.
- Cyber offers penetration testing, vulnerability exploitation, and malware reverse engineering capabilities.
- Altman previously criticized Anthropic for similar gatekeeping of their cybersecurity tool, Mythos.

**Companies:** OpenAI, Anthropic

[Read the full story on TechCrunch](https://techcrunch.com/2026/04/30/after-dissing-anthropic-for-limiting-mythos-openai-restricts-access-to-cyber-too/)

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