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How Claude's text watermarking works

Anthropic: Patterns and problems in multiagent systems

Learning more about Claude's mathematical capabilities

Anthropic Risk August 2026 [pdf]

The Conceptual Reasoning Index

Claude Opus 5

Societal Impacts: Claude's values across models and languages

Discovering Cryptographic Weaknesses with Claude

Investigating three real-world incidents in our cybersecurity evaluations

Claude Opus 5

Our position on open-weights models

Redeploying Fable 5

A new way to reflect on how you use Claude

Ben Bernanke Joins Anthropic Oversight Trust

Anthropic updates their terms to verify age or identity

Statement on US government directive to suspend access to Fable 5 and Mythos 5

System Card: Claude Fable 5 and Claude Mythos 5 [pdf]

Claude Sonnet 5

Claude Corps

When AI Builds Itself: Our progress toward recursive self-improvement

Claude Tag

Claude Fable 5

Making Claude a Chemist

Project Fetch: Phase Two

Claude Mythos 5 / Fable 5

Expanding Project Glasswing

Anthropic confidentially submits draft S-1 to the SEC

The ways we contain Claude across products

Claude Opus 4.8

Natural Language Autoencoders: Turning Claude's Thoughts into Text

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