# OpenAI met with 50 cyber defense practitioners across various federal agencies, state governments, and Five Eyes allies to unveil its new GPT-5.4-Cyber model.

*genai · news · 2026-04-22 · Benzinga*

## Key points

- OpenAI introduced GPT-5.4-Cyber, a new cyber-focused model, to 50 cyber defense practitioners.
- GPT-5.4-Cyber will be accessible via a public version and a restricted 'Trusted Access' program for defenders.
- The model’s intelligence-sharing partnership includes Australia, Canada, New Zealand, and the U.K.
- NSA is reportedly using Anthropic’s Claude Mythos Preview despite Pentagon designating it a supply chain risk.
- Anthropic's Claude Mythos Preview was recently made available to over 40 additional critical infrastructure organizations.

**Companies:** OpenAI, Anthropic
**Countries:** United States, Australia, Canada, New Zealand, United Kingdom

[Read the full story on Benzinga](https://www.benzinga.com/markets/private-markets/26/04/51982721/openai-briefs-governments-on-new-cyber-ai-model-amid-anthropic-claude-rivalry)

---

Canonical: https://newsio.io/n/ba462d56-3478-4d8d-8c15-bacb6d7a6725/openai-met-with-50-cyber-defense-practitioners-across-various-federal-agencies-s
Summarized by Newsio from Benzinga. https://newsio.io/how-it-works