The answer is, of course lol?

Gamers Nexus did a whole deep dive which basically proved that Chinese researchers had access to whatever they wanted.

https://youtu.be/1H3xQaf7BFI?si=ojlxOC7uiPqZxv0N

edit: not sure if this was sarcasm

Some of the big LLM labs have written about their training hardware.

DeepSeek v3 was trained on 2,048 NVIDIA H800s. https://arxiv.org/abs/2412.19437

MiniMax M1 used 512 H800s. https://arxiv.org/abs/2506.13585

The H800 wasn't banned in the first round of export controls - but was after October 2023: https://www.cnbc.com/2023/10/17/us-bans-export-of-more-ai-ch...

Z.ai say they used Huawei hardware: https://www.theregister.com/2026/01/15/zhipu_glm_image_huawe...

Qwen and Kimi haven't disclosed their hardware as far as I can tell.