Every time a Chinese lab releases a new model, I give it a solid try that same weekend and drive it hard by giving it the exact same tasks that I give to Claude/Codex models. And the new releases all have the same issues: they start out strong, but start deviating after about ~30 minutes and I quickly find myself in a quagmire where the model makes mistake after mistake while fixing its previous mistakes. Sometimes these are minor. Occasionally they can be pretty bad. Like, would-cause-data-loss-if-merged bad.
Ultimately I also reject the notion that Chinese labs are only a few months behind US labs. We haven't had an actual Fable-level model come out of China. AFAIK only Kimi 3 was claimed to come close, and then it turned out that not only had they heavily distilled Anthropic models, but, unbeknownst to their users, they were routing some percentage of their requests to Fable.