Expired50% confidenceFactExact time
Since version v2.91, the Claude client has contained a detection logic that activates when users set an unofficial API endpoint, checking whether the device's time zone is Asia/Shanghai or Asia/Germany and whether the proxy domain is in a list of 147 obfuscated entries.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/19/2026
First Seen
Valid until: 10/17/2026(expired)
Sources
Related Claims
UnverifiedThe detection mechanism checks whether the device's time zone is 'Asia/Shanghai' or 'Asia/Germany', and whether the proxy domain appears in an obfuscated list of 147 entries.80% similarUnverifiedAnthropic's Claude client has contained a detection logic since version v2.91 that is activated when a user sets an unofficial API endpoint.79% similarUnverifiedClaude Code's detection mechanism reads the system time zone to determine whether it is Asia/Shanghai or Asia/Urumqi, and scans proxy addresses for Chinese company domain names.77% similarUnverifiedTrae's authentication script generation covers complete business logic including username existence verification, account disabled status check, password correctness verification, and permission expiration judgment, generating hundreds of lines of code in one go.59% similarUnverifiedIn the second round of testing, Claude automatically extended the detection pipeline into a Streamlit web application, including start/stop buttons, a confidence threshold slider, real-time detection statistics, and WebRTC integration.57% similar
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