{"data":{"id":"879049ff-1a8d-4a26-a6b4-75fa770202db","title":"UK banks blocked from cyber AI tool Mythos get offer from rival OpenAI","summary":"Two AI tools designed to find security weaknesses in digital systems, Anthropic's Claude Mythos and OpenAI's GPT-5.5 Cyber, have raised concerns among UK financial regulators about potentially undermining banking security. Anthropic has restricted access to Mythos for UK banks, while OpenAI has now offered its competing tool to nine major UK banks including Lloyds, HSBC, and Nationwide. Both companies are limiting access to these powerful security-testing tools, with Anthropic claiming their model is more capable and therefore requires more caution, while OpenAI argues the tools should be available to 'the right people' who maintain order rather than those seeking to cause disruption.","solution":"Anthropic states it is 'urgently working to expand access to Mythos,' though no specific timeline or conditions for that expanded access are detailed in the source text.","labels":["security","policy"],"sourceUrl":"https://www.bbc.com/news/articles/cm2p3j6lvn7o?at_medium=RSS&at_campaign=rss","publishedAt":"2026-06-01T17:07:20.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["OpenAI","Anthropic"],"affectedVendorsRaw":["OpenAI","Anthropic","GPT-5.5 Cyber","Claude Mythos"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"patchAvailable":null,"disclosureDate":"2026-06-01T17:07:20.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity"],"aiComponentTargeted":"api","llmSpecific":true,"classifierConfidence":0.85,"researchCategory":null,"atlasIds":null}}