Openrouter is for open models. Makes sense that the open weight models top the leaderboard.

Patently untrue, Anthropic and OpenAI models are both within the top 10. They’re just missing from the top 5.

The closed models are on Openrouter as well. But to the original point, you're not likely to see many people use Openrouter to run Claude or Codex, so it's not good for making comparisons on that basis.