OpenAI to give EU access to new cyber model but Anthropic still holding out on Mythos

OpenAI announced it will give the European Union access to GPT-5.5-Cyber, a specialized AI model designed for cybersecurity defense, while Anthropic has not yet granted similar access to its competing model called Mythos. The EU plans to review OpenAI's model closely to address security concerns, though discussions with Anthropic about accessing Mythos are still at an earlier stage.