Accidental Watermark Leak: Kimi Picks Up Claude's Mark via Training Data

yuxiangw_cs · x · 2026-08-11

A user shared an amusing case of AI data contamination: Alice used Claude to generate a large amount of text and then asked Kimi to paraphrase it to avoid AI detection.

However, Kimi had scraped Alice's data during training, inadvertently inheriting Claude's hidden watermark. This comedic incident highlights the ongoing challenges of watermarking and data provenance in LLM training.

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