I track LLM prices every 3 hours. GLM-5.2 quietly went from ~$0.57/$1.80 to $0.90/$3.08 per 1M this week, with no announcement.

I run a small side project that pulls model pricing from OpenRouter every few hours and diffs it, so I caught something this week I hadn't seen laid out anywhere: GLM-5.2's price bounced around, and net climbed hard. Input went from roughly $0.57 to $0.90 per million, and output from about $1.80 to $3.08, across about 10 separate repricings in 7 days. No changelog, no post, just providers adjusting. Tencent's new Hy3 (a 295B MoE) did the same thing in the other direction, dropping then rising. Two takeaways if you build on these: The cheap Chinese model cost advantage is real (Nex-N2-Mini shipped this week at $0.025/$0.10), but the pricing is volatile enough that you want a fallback wired in, not a hardcoded provider. If you pin a model by price, you probably want to monitor that price, because nobody announces these changes. Full disclosure: I track this for a free weekly AI roundup I send. Happy to link if that's allowed here; otherwise, the data is the point. Have others seen the same volatility, or found a good way to alert on provider price changes?