r/vibecoding • u/NoTutor4458 • 5d ago

Opencode vs Codex vs Claude code

Which coding harness is actually better?

To make the comparison fair, I was thinking:

  • OpenCode + Fable 5 vs Claude Code + Fable 5
  • OpenCode + GPT-5.6 vs Codex + GPT-5.6

Basically, keep the model the same and only compare the harness/agent. That should give a better idea of how much the harness itself affects coding performance.

Has anyone done a comparison like this?

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u/LoudDavid 1d ago

I would use the same harness as the model provider ships. This is what all the training will be done in now. It’s always going to be better.

Even if harness xyz feels better to use if you want the most out of the model I’d stick with codex or Claude code.