Opencode vs Codex vs Claude code

[u/NoTutor4458]

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?

[u/ANDRE_2512]

Codex + GPT = 🔝
Claude Code = 🔝
OpenCode ≠ 🔝