I've been using OpenRouter since relatively early (I build evvl.ai - an eval platform on top of it) and think that they're selling at a good time.

An underpinning of their model is that API calls / inference are similar across providers allowing for commodity tokenization cost comparisons, but the providers are beginning to shift to non commodity features that don't easily shift.

For instance, calling Gemini with "search grounding" isn't something that OpenRouter can do (they sub their own web search in), last I checked they weren't doing real time voice models, etc.