[AINews] Claude Tag: Multiplayer, Proactive, Persistent Agents in Slack

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

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

Three AI-Adjacent Stories Were Combined Into One Headline

Google Sues Chinese Cybercrime Network That Used AI to Defraud Hundreds of Thousands of Users

Sam Altman Confirms AI Token Costs Are 'a Huge Issue.' Spending Continues.

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