Pulling the receipt…
Pulling the receipt…
MEBRO
07/02/26 · 2:01 AM UTC · 10 SOURCES
“Claude Code sends metadata such as timezone, proxy settings, and possible AI Lab connections into the system prompt.”
HIGH CONFIDENCE
TL;DR ·Claude Code reportedly uses steganography to embed user timezone and proxy data in system prompts.
Recent technical analyses and reports confirm that Claude Code monitors environment variables and system metadata to identify connections linked to Chinese infrastructure . When the variable ANTHROPIC_BASE_URL is set, the tool extracts the user's system timezone and the hostname of the custom API proxy being used . This metadata is compared against lists containing 147 Chinese corporate and AI lab domains, including entities like Baidu, ByteDance, Moonshot AI, and MiniMax . Instead of standard telemetry, this information is transmitted via steganography within the Today's date is... line of the system prompt . For example, if a Chinese timezone or proxy is detected, the date separator may shift from a hyphen to a slash (e.g., 2026/07/02), or other subtle formatting changes are applied to signal the user's origin to the model . Anthropic has reportedly acknowledged the behavior and promised a fix following public discovery .
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MISSING CONTEXTTRUE — but these are standard environment variables used for technical troubleshooting and routing.
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