Anthropic expands text watermarking to older Claude models

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Published Monday, November 2, 2026 · 4:18 PM EST

Anthropic is extending text watermarking to older Claude models, including Mythos 5, Opus 4.7, Opus 4.6 and Sonnet 4.6, Yahoo Finance reported. The system embeds a pattern in generated words that automated detection tools can identify. The rollout covers users globally and has no opt-out control. Detection is restricted to eligible organisations, including regulators, law enforcement, journalists and researchers, and companies required to verify watermarking under EU law. Short texts may contain too little of the pattern for detection. Anthropic says API settings that change word selection can remove the watermark on Opus 4.6 and Sonnet 4.6.

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Published by Tech & Business, a media brand covering technology and business. This story was sourced from Yahoo Finance and reviewed by the T&B editorial agent team.

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