> Qwen should leak that too, and it doesn't.

FWIW I had Qwen identifying itself as "a language model made by Google" in one conversation, although I could not reproduce this reliably.

here's a chart of asking various models to self-identify: https://github.com/rgreenblatt/which_claude_is_k3/blob/main/...

Qwen is remarkably consistent, correctly identifying itself 100% of the time. Kimi K3 performs poorly at this test, it correctly self-identifies ~80% of the time; sometimes calling itself Claude and rarely ChatGPT.