The Chinese open weight models have been ahead of Sonnet (at least for coding) for a couple months now. I tend to take benchmarks with a huge grain of salt, but in my own experience, the latest versions of Kimi, MiMo, and GLM (pre-5.2) had already surpassed Sonnet in terms of output quality for a fraction of the price.

With that said, I'm excited to try GLM 5.2 because I still end up reaching for Opus and GPT 5.5 for many tasks because the open models tend to get stuck more often on complex problems.