According to The Information, citing internal Tencent memos and sources, Tencent employees used Anthropic’s Claude Code during the post-training phase of Hy3, the company’s latest large language model, despite Anthropic’s explicit ban on commercial services to Chinese firms citing national security concerns.
Hy3 features a 295B parameter mixture-of-experts architecture. During the RLHF (reinforcement learning from human feedback) stage, Tencent staff served as human evaluators with usage capped at thousands of tokens per person. Internal memos provided Claude Code installation guides. Tencent employees used Claude Code to generate high-quality reference examples for scoring anonymous model outputs, rather than what they characterized as distillation. An Anthropic spokesperson stated the company actively monitors for distillation attacks but did not directly address Tencent’s use of Claude Code.
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