Anthropic moves to close loopholes allowing Chinese companies to access Claude AI tools

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Anthropic is cracking down on unauthorized access to Claude AI after discovering Chinese companies like Ant Financial and ByteDance have been using workarounds including overseas subsidiaries, cloud providers, and VPNs to bypass its stringent restrictions. While these methods don't violate US or Chinese law, they breach Anthropic's terms of service, which explicitly ban Chinese companies from using its models.

Anthropic Intensifies Crackdown on Unauthorized Claude AI Access

Anthropic is stepping up efforts to close loopholes for AI access that have allowed Chinese companies to circumvent the company's stringent restrictions on unauthorized access to Claude AI in China. People familiar with the matter revealed that Chinese companies accessing Claude include Ant Financial and ByteDance, both of which have found creative workarounds to use the AI tools despite explicit bans

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The methods used don't violate US or Chinese law, but they breach Anthropic's terms of service, which specify that Chinese companies and foreign entities owned by them are prohibited from using its models. Anthropic maintains one of the strictest bans among US AI companies on usage in China, requiring user verification and banning payment from Chinese banks

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How Chinese Companies Are Bypassing Geopolitical Restrictions

Ant Financial has provided employees with corporate Claude accounts accessed through the company's intranet, which connects to its Singapore-based entity. This use of overseas subsidiaries allows engineers based in mainland China to access the platform through their companies' internal networks

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ByteDance has taken a different approach. While the TikTok owner doesn't facilitate direct access to Claude, it introduced a reimbursement scheme this year allowing engineers to put personal subscriptions for the platform on their expenses, according to five employees. These engineers then access those subscriptions using VPNs

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Another route involves accessing Claude through Microsoft Azure cloud services via foreign subsidiaries. Microsoft sold API access to Chinese companies with Singapore-based entities, enabling this workaround. A person familiar with the practice described companies using overseas entities to access Claude as "a known issue" that's "not limited to any one provider"

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Transfer Station Services and Detection Methods

As part of Anthropic tightening restrictions, the company has targeted transfer station services, which relay requests from users in mainland China through Claude accounts registered overseas before returning responses. However, larger Chinese AI groups generally avoid these services because operators are widely suspected of storing or reselling prompts, creating concerns about data leaks. Executives worry rivals could analyze those requests to understand how they're using advanced models to improve their own systems

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Anthropic has constantly updated its tools to identify and take enforcement action as Chinese users develop new evasion techniques. The company has previously used Claude Code to look for clues such as a computer's timezone to detect whether a user was actually working from mainland China

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Why Claude Remains Valuable Despite Growing Regulatory Hurdles

The efforts to access Claude from China illustrate the continuing value of leading US AI products to Chinese engineers despite growing access restrictions and the increased competitiveness of domestic models. Anthropic's coding tools are particularly popular among Chinese software engineers and AI startups because their outputs can be used for "distillation," in which smaller models are trained to mimic more capable ones

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This demand persists even though Beijing has banned its companies from using overseas models hosted in data centers outside the country to develop consumer applications because of restrictions on cross-border data flows. However, the regulation doesn't restrict Chinese AI labs from using foreign models for internal research and development purposes

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Anthropic stated it "explicitly prohibits accessing or facilitating access to Claude in unsupported regions, including China," adding that it's "the only frontier AI company that restricts sales to PRC-controlled companies, including subsidiaries incorporated outside China." The company enforces this policy through "continuous, evolving detection systems, working alongside our partners to identify and ban accounts that violate our policies"

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. Microsoft confirmed that "Anthropic monitors use of the service and enforces their terms and conditions, with Microsoft's support"

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