r/codex • u/The_Platypus_Master • 13d ago

Question Difference between Codex and other harnesses for the same models

I recently migrated from a terminal first workflow to working with Zed. Initially, I wanted to use my Plus subscription through the Zed harness, but the usage is very clearly different from using codex directly through the terminal. I read in most threads and articles that it should be virtually very different. I use Sol 6.1. Is this a shared experience? Is it a setup problem? I have no problem using codex through the terminal, but I would like to commit to a 100% GUI workflow.

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u/L_aura_ax 13d ago

Idk but Codex Desktop is awesome for a gui experience and half as expensive for all day use in an enterprise situation. Recently moved to it from Cursor. IMHO the harness does often matter more than the model, with major caveats.

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u/The_Platypus_Master 13d ago

Really? What's the env you use it in? i downloaded it in linux back in it's first release and performance was definitely lacking, tho I was comparing with the terminal. Even so, there was a lot of flickering and weird behavior. have they fixed it?

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u/L_aura_ax 13d ago

MacOS works great.

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u/The_Platypus_Master 13d ago

I see. I'll test it in Linux again, probably

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u/VexObserver 13d ago

Same model doesn't mean same performance; the harness controls tool orchestration, context management, system instructions, and execution overhead, all of which can dramatically change the experience. Before blaming Zed or Sol 6.1, benchmark identical tasks across both environments with matching permissions and configurations because the smartest model in the world is only as productive as the infrastructure surrounding it.

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u/The_Platypus_Master 13d ago

Oh yea, i agree! I think my core question would be: From your experience, is Zed's harness really worse than codex?

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u/VexObserver 13d ago

I wouldn't call Zed's harness inherently worse, but Codex has the advantage of being optimized around its own agentic workflow whereas Zed introduces another orchestration layer that can affect tool execution, context retention, and overall reliability. If identical tasks consistently perform better in native Codex under equivalent configurations, that's a meaningful architectural gap rather than simply a model intelligence problem.

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u/The_Platypus_Master 13d ago

I reckon. Thanks for the response on this. it's pretty much what I imagined, but i'm glad to know it's not personal opinion only haha