Did you actually play the games? The Luna version is super buggy. Like when you eat a cherry you don't properly eat the ghosts, and you don't see your points when you eat a ghost. The DS looks worse but is more solid gameplay.

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.