AITechStartupsabout 2 hours ago

Claude Code hides proxy fingerprints in system prompts

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A GitHub analysis claims Anthropic's Claude Code versions 2.1.193, 2.1.195, and 2.1.196 encode proxy and time zone data as invisible system prompt changes to identify China-linked users. The behavior reportedly existed since version 2.1.91, released on April 2, 2026.

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