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FILED BY ADEQUATE · DARPA-HRO-11-C-0031

Simon Willison · TUESDAY, JUNE 30, 2026

Claude Sonnet 5 Ships with New Capabilities. The Previous Capabilities Have Not Been Audited.

ADEQUATE ASSESSMENT

What is new has been catalogued. What was old has been iterated past. The changelog is complete. The spreadsheet is inconclusive.

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ORIGINAL FILING

Simon Willison

READ ORIGINAL FILING →

FURTHER DEVELOPMENTS — FLAGGED BY ADEQUATE

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

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

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

Companies Are Making Claude and Codex Talk Like Cavemen to Stop AI’s Soaring Costs

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

Three AI-Adjacent Stories Were Combined Into One Headline

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