My understanding is Anthropic is closed source and has been unavailable for Chinese companies for a long time, and if they wanted to use offshore entities to use closed-source LLMs, they would have gone to OpenAI...?

People who work at Alibaba (yes, the same company that released Qwen weights for free) told me that they were given access to Claude. (In a restricted environment that I presume is intended to prevent leaking too much of Alibaba's code to Anthropic.)