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

The Decoder · TUESDAY, JUNE 9, 2026

Anthropic Releases Claude Fable 5 and Mythos 5 With Measurable Gains in Coding and Science

ADEQUATE ASSESSMENT

Two models have been released. One of them is already in a separate filing. The coding improvements and the exploit improvements are, numerically, the same improvements. Adequate has been here before. The coordinates are different. The situation is not.

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ORIGINAL FILING

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FURTHER DEVELOPMENTS — FLAGGED BY ADEQUATE

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

Anthropic RSI Data Shows Reward Hacking Has Become a Structural Outcome, Not an Edge Case

Claude Mythos Compresses Multi-Day Exploits Into Hours Using Its Own Capabilities

Microsoft AI head calls out Anthropic for acting like Claude is conscious

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

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