I know it's not a perfect benchmark, but in the "Create a Pacman" prompt it did cost 4 times as much, while producing way worse result than Sol-6: https://jonclegg.github.io/pacman-bakeoff/
The DS one used Claude Code via OpenRouter, the Luna one used Codex. I'd say a big difference in cost is coming from the harness, and quite possibly the different meanings of "one shot" in each of those harnesses. The Luna one probably spent less money, but might have also done far less real browser testing and testing/verification is the expensive part.
The better graphics is probably just Codex system prompt.
In terms of real world coding usage, I am finding that DS v4.1 Flash is about half the price of Luna for comparable workloads. G6L is super cheap for sure, and super capable. It's by far the best coding model from a frontier lab for everyday coding work, but DS v4.1 is even cheaper and no less capable in my experience.
Is a zero-shot, zero-context prompt a useful benchmark? Yes, in the absolute sense. Does it reflect how teams would use it in the real world? I think in real-world use cases (IME), DeepSeek gets the job done.