I’ve gone that route. I really wanted to stop using Claude, but Deepseek v4 Pro and Kimi 2.6 didn’t do the job. For a lot of coding tasks or well-specced plans, maybe… but then that’s a plan made by Opus anyway.
Even Sonnet is sometimes not worth the trouble. Opus is very thorough and reviews its own mistakes quite well. Catches a lot of edge cases.
I’m not saying we shouldn’t try other things — I did! —, but it’s more or less okay that people just like Claude Code subscriptions? The back and forth I had with Kimi on a small feature came out to ~1.8€, which is 10% of my Claude subscription each month. And that was a single session. CC with Serena uses tokens fairly well.
If you think short-term and only about yourself, paying for SOTA regardless of how many military contracts the lab has is the best thing, but paying for open models is both better ethically, and for a future where AI belongs to everyone and not just to Altman et al.