Anthropic on June 24 wrote to US officials accusing China's Alibaba Group Holding of illicitly accessing its Claude AI model on a large scale using roughly 25,000 fraudulent accounts, calling it the largest known attempt by a Chinese company against the firm.
June 24, 2026 · Anthropic
Anthropic Accuses Alibaba of Siphoning Claude With 25,000 Fake Accounts
In letters to US senators and White House officials, Anthropic alleges operators tied to Alibaba's Qwen lab used ~25,000 fraudulent accounts to extract Claude's coding and agentic-reasoning capabilities — its largest such case yet from a Chinese firm.
~25,000
fraudulent accounts in the Alibaba-linked campaign
28.8M
exchanges generated with Claude (Apr–Jun 2026)
2
large-scale distillation cases flagged in 2026
Two cases compared — exchanges with Claude
Each block ≈ 4 million exchanges
28.8M
Alibaba-linked~25,000 accounts · Apr–Jun
16M+
DeepSeek / Moonshot / MiniMax~24,000 accounts · Feb
Both campaigns targeted Claude's strengths in coding and agentic reasoning.
How a distillation attack works
Teacher model Claude's high-performance outputs
→
Mass extraction ~25,000 fake accounts + proxy services
→
Student model Smaller model trained on those outputs
Distillation is a legitimate way to shrink your own models — but used at scale against a competitor it raises IP-infringement concerns and can produce models that lack safety guardrails.
Anthropic's countermeasures & warning
Bars commercial access to Claude in mainland China and at Chinese subsidiaries
Tighter account controls and indicator-sharing with cloud partners
Anti-distillation techniques, such as injecting fake tools
The warning: such conduct circumvents US export controls and creates national security risks when illicitly distilled models ship without safety guardrails.
The grey area
Industry voices note distillation is a standard method — the real questions are scale and whether terms of service were breached. Lines remain hard to draw.
Still unfolding
The case is fresh; direct reaction from Claude users and developers is limited, and Alibaba had not issued an official response at announcement.
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