But only a few models can actually execute commands effectively.. what is it, Claude and Gemini? Did I miss any?

kiwi k2, Qwen3-Coder

Qwen3 issued such stupid commands I wouldn't count it in the same universe as Claude or Gem. I still need to test out Kimi, though- Cheers!

Seconding Kimi K2

glm 4.5 air too

has a ton of bugs

works quite reliably with claude-code-router and any agentic SOTA model (not necessarily anthropic)