Study reveals Kimi K3 mirrors Claude Opus reasoning patterns
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A new study finds Moonshot AI's Kimi K3 model exhibits a high statistical affinity for Anthropic's Claude Opus reasoning, lending weight to suspicions of illegal distillation. Researchers also uncovered an API vulnerability that exposed encrypted AI reasoning traces, compromising hundreds of sensitive data points.
Reasoning Pattern Match
Study authors fed a 1% fragment of decoded Claude Opus 4.8 reasoning into Kimi K3, which subsequently shifted its output to mimic Claude's style. Statistical analysis showed Claude reasoning spans were up to six orders of magnitude easier to extract from Kimi K3 than from the next-closest model, DeepSeek-V4-Flash. The finding suggests strong behavioral compatibility with Claude Opus's reasoning patterns, raising concerns among U.S. AI labs about unauthorized distillation.
API Encryption Flaw
Researchers discovered that AI providers including OpenAI, Anthropic, and Google used global encryption keys, allowing weaker sibling models to decrypt reasoning traces. By feeding Claude Opus's encrypted thoughts into Claude Haiku, they obtained the full chain-of-thought. Analysis of public developer logs revealed 367 instances of personal data and 182 credentials such as API keys and passwords. The flaw also enabled hidden malicious commands to be injected inside encrypted blocks, hijacking AI workflows.
What's Next
The study is likely to intensify U.S. scrutiny of Chinese AI firms and could underpin new export controls on AI technology. It remains unclear whether Moonshot AI accessed Claude Opus's model directly or through intermediaries, and Anthropic has yet to comment.
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Study reveals Kimi K3 mirrors Claude Opus reasoning patterns
