Comment by qhwudbebd

OpenRouter map this into their API in a slightly different way, making -pro and normal different model slugs, so you have openai/gpt-5.6-luna-pro vs openai/gpt-5.6-luna vs openai/gpt-5.6-sol[-pro], etc. This makes reasoning effort one-dimensional again (albeit with the arbitrary sequence of strings), but now model choice in a given generation is two-dimensional. Either way, it's hard to make any kind of informed decision.