I encourage you to review the links before committing to a position. The writeup on K3's anomalous trans-model identity is very comprehensive.

K3 reproduces Claude's internal model identifier when prompted, something which the real Claude models themselves do not emit. This is highly suggestive that K3 was trained on Claude metadata (API logs, tagged synthetic data), rather than Claude's chat outputs.

And it's well documented that Chinese labs are buying large amounts of raw Claude metadata https://www.chinatalk.media/p/how-to-buy-cheap-claude-tokens...

For context you just asked me to read a document that starts with:

"Caveat: fully AI-generated research."

And that you quoted or paraphrased directly.