UK banks offered access to OpenAI’s GPT-5.5 amid exclusion from Anthropic’s Glasswing expansion

This news report covers Anthropic's Project Glasswing expansion and access to its Mythos Preview cybersecurity model, noting that several UK banks were excluded and instead received access to OpenAI's GPT-5.5 Cyber. It discusses the political and security concerns around selective access for critical infrastructure, mixed assessments of Mythos' effectiveness at finding vulnerabilities, and Anthropic's cautions about publicly releasing such powerful cyber-capable models until robust safeguards are developed.