Edition November 6, 2026

Anthropic's text watermark is easy to bypass on several older Claude models

For the four models in Anthropic’s current wave, the watermark is applied only if temperature, top_p and top_k remain at their default settings.

Anthropic’s watermark can be bypassed by making a minor change to any one of temperature, top_p or top_k, which control randomness in word selection. Anthropic says the watermark adds no characters or tokens, does not change pricing or request and response formats, and barely slows output; it carries no information about users, their organizations or their conversations with Claude.

This summary is based on the available full source text. Summary prepared with AI assistance. The original source is authoritative.