Anthropic has accused Chinese technology conglomerate Alibaba and its AI research division, Qwen, of carrying out a large-scale effort to extract capabilities from its Claude family of artificial intelligence models, describing the incident as the most extensive distillation operation the company has encountered.
The allegations were detailed in a June 10 letter sent to U.S. Senate Banking Committee Chair Tim Scott and Ranking Member Elizabeth Warren. In the correspondence, Anthropic claimed that operators linked to Alibaba and Qwen systematically interacted with Claude in an attempt to capture and reproduce some of the model’s most advanced capabilities.
According to the company, the activity occurred between April 22 and June 5, 2026. During that period, Anthropic says it recorded more than 28.8 million exchanges associated with the operation. The requests were allegedly distributed across nearly 25,000 fraudulent accounts, enabling the actors to conduct high-volume interactions with the platform while obscuring the true source of the activity.
Anthropic stated that the campaign was not focused on general-purpose chatbot functions. Instead, it allegedly targeted capabilities considered among the most valuable within the Claude ecosystem, including software engineering tasks and advanced agentic reasoning. These functions form a critical component of the company’s Mythos Preview model, one of Anthropic’s most sophisticated AI systems designed to perform complex reasoning and autonomous task execution.
At the center of the allegations is a technique known as adversarial distillation. In machine learning, distillation generally refers to the process of training a model using outputs generated by another system. While the approach itself is commonly used within the AI industry, Anthropic argues that the method becomes problematic when it relies on unauthorized access to proprietary models.
According to the company, the actors behind the campaign repeatedly queried Claude and collected its responses at scale. Those outputs could then be used as training material for another AI system, allowing developers to reproduce aspects of Claude’s behavior without investing the time, computational resources, and research expenditure typically required to build a frontier model from the ground up.
Anthropic warned lawmakers that such activity enables organizations to appropriate years of research and development through large-scale extraction campaigns. The company argued that these operations are designed to gather capabilities developed by leading U.S. AI laboratories and incorporate them into competing systems without bearing the costs associated with original model development.
Beyond intellectual property concerns, Anthropic also raised questions about safety. The company noted that models trained through adversarial distillation may replicate useful capabilities while failing to inherit the safeguards, alignment mechanisms, and risk controls embedded within the original system. As a result, the practice could create AI models that retain advanced functionality but operate with fewer protections against misuse.
The allegations against Alibaba follow earlier claims made by Anthropic regarding unauthorized access attempts linked to Chinese AI developers. In February 2026, the company disclosed that DeepSeek, the startup whose low-cost AI models attracted global attention in 2025, was among several organizations accused of attempting to improperly obtain Claude outputs. Anthropic now characterizes these incidents as part of a broader pattern of repeated efforts to extract capabilities from leading U.S. AI systems.
The dispute emerges amid growing government scrutiny of advanced AI technologies. Earlier this month, Anthropic revealed that it had received guid
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