Then why imply that it is a commodity because they (partly) compete on price?
Fungibility is the defining characteristic of commodities. While these products can be used to accomplish the same task, we're not near real fungibility yet.
Products that are fungible compete on price (what else?). Chat-with-AI services that have similar performance are pretty fungible today. Switching from one to the other is... remarkably easy. The moment Gemini Flash's competitors start losing customers they will lower their prices to remain competitive.
Lots of products besides commodities will lower their prices to remain competitive. General Electric keeps their prices competitive with Pratt & Whitney, but that doesn't make jet engines a commodity.
This product from Google clearly competes on price/performance ratio, speed and of course, brand.
