Opus is definitely in its own league. I use Kimi/Gemini-cli code regularly to save cost and from my experience, Kimi 2.5 is more solid than Gemini Flash 3.0 for coding. While Gemini Flash 3.0 is generally faster, it usually break the syntax and skip important prompt. Kimi 2.5 can write very good code and can plan very well.
I've been using kimi, though not kimiclaw, for research and it is good - comparable to phind, better than GLM 4.7 . Opus 4.6 wasn't as good for my particular domain of interest. I think the long term pricing asymptote for US vs china is essentially dependent on energy pricing and so china will continue to undercut US AI pricing.
Did you scroll through the pricing options? The largest Kimi plan is $199/month. “Much better” depends on how much usage is included vs. Anthropic plans/API costs.
Edit, self answer: https://www.kimi.com/membership/pricing