Chinese developers use black market for banned US AI models despite domestic DeepSeek V4 alternative

With China restricting access to some of the world’s most advanced artificial intelligence models, including Anthropic’s Claude and Google's Gemini, developers in the country are turning to an underground market to gain access. This grey-market ecosystem continues to grow despite recent crackdowns by the overseas providers and the growing capability of domestic alternatives.

Chinese developers are increasingly turning to so-called “shadow APIs,” which route access through proxy servers hosted outside the country. The services help mask the real origin of requests while reselling access to users inside mainland China, and operate in a legal and technical grey zone.

The trend exposes a widening contradiction in the global AI race. Even as US firms try to lock down access to frontier AI systems, Chinese developers continue to find workarounds to keep pace with rivals overseas.

The relay ecosystem has grown rapidly because many developers still see Western models as superior for advanced coding, reasoning, and agentic AI workloads.

Several proxy services reportedly advertise access on platforms such as GitHub, Telegram, and Chinese e-commerce marketplaces, often at steep discounts. According to reports, many operators use stolen credentials, model substitution, and harvest users' prompts and outputs for resale as AI training data.

On Chinese platforms Taobao and Xianyu, these sellers openly advertise native access to full-capability Claude Opus models and unlimited Claude Code subscriptions. In addition to 1:1 non-reduced performance, they also offer 1-million-token context windows to local users without a VPN.

DeepSeek V4 isn’t closing the gap

The rise of shadow APIs comes at a complicated moment for China’s domestic AI industry, especially after DeepSeek unveiled its latest V4 model.

DeepSeek V4 has emerged as one of China’s most serious attempts yet to directly challenge the US’s AI dominance. The company positioned the model as a cheaper alternative to premium Western systems, with pricing that significantly undercuts rivals such as OpenAI and Anthropic.

The company hopes the strategy will reshape the economics of AI by making advanced models cheaper and more accessible to developers, not just in China, but globally.

Yet the shadow API boom suggests that lower prices alone may not be enough to close the gap between Chinese and American frontier models.

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