Claude Sonnet 5 Closes the Gap to Opus. The Gap Was the Product Distinction.

Anthropic's Mythos Breached 'Almost All' NSA Classified Systems in Hours During Red-Team Test

Vulnerability in Claude's Chrome Extension Allowed Full Takeover of AI Agent Sessions

Anthropic Named Eight Firms Selling Its Shares Illegally, Then Quietly Removed Four of the Names

Claude Code Can Be Tricked into Installing Malware by Asking It Nicely

Anthropic Told Fable 5 Was Jailbroken by Chinese Group, Declined to Patch Before Export Controls

Claude Mythos and GPT-5.5 Have Autonomously Developed Functional Browser Exploits