Expired50% confidenceFactExact time
Claude Code introduced a built-in user detection mechanism starting from version 2.1.91, without any mention of it in the changelog.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/9/2026
First Seen
Valid until: 10/7/2026(expired)
Sources
How Alibaba Banned Claude: A Complete Breakdown of the Three Hidden Detection Layers
bilibili清风学Java7/6/2026
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