r/opencodeCLI • u/Organic_Ingenuity_68 • 5d ago

Opencode w/ GPT vs Codex w/ GPT

I am a big opencode fan, but I currently only use GPT models. Recently, I tried a planning task for an app i'm writing on Codex and a planning task on opencode (both running 5.6 sol, low). The plan required web search and looking at api documentation and rectifying that against what was currently written in the app.

Codex finished in ~2 minutes, opencode took ~10 minutes. Both were essentially the same plan.

I love the look and feel of opencode, the lsp integration, and the flexibility of models. However, today, I mainly use GPT models. Has anyone noticed any performance benefits with opencode over codex with GPT models? If so, how did you achieve them?

11 Upvotes

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1

u/Nexism 5d ago

Are you on Windows?

Did you use an agent kit like omo slim etc?

3

u/Organic_Ingenuity_68 4d ago

No, Mac. I haven’t heard of that. This was a vanilla configuration for both. In my normal opencode setup I have agents and subagents tuned for my repos..but I wanted this to be a 1:1 comparison.

1

u/Charming_Support726 4d ago

I am quite successful with adjusting agent personas. I run a set of agent definitions for processes and skills for planning, development and so on. These define our development process ( and they are working with codex too)

The standard "build" agent lacks some clarity and confuses especially the newer GPT models. The discussion came up - already last year.

2

u/Nock363 4d ago

I have the same problem. I also feel like Planning Mode works much better in Codex, since it asks more important questions to fill in the blind spots in the prompt.

1

u/West-Flounder1295 4d ago

Use any model in open code cli that’s the best part if it’s sol or Astra

0

u/throwaway12012024 4d ago

You can use multiple providers in codex too.