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If you mean chatgpt.com, try with a real “agent” harness. The exact same model on chatgpt.com frequently performs much worse than it does with a proper harness, not to mention that the chatgpt.com frontend itself is quite bad.

codex-rs, popularly known as Codex or maybe the Codex CLI, is a fine choice.

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Codex has been renamed to chatGPT.

Since when?

https://learn.chatgpt.com/docs/codex/cli

https://github.com/openai/codex

Looks like it's still a more-or-less-open-source product called Codex CLI.

FWIW, there have been issues with various versions of ChatGPT not knowing what Codex is -- at least in the (IIRC) GPT-5.3 timeframe, there were serious issues with the knowledge cutoff.

They did it about a month ago for the desktop Codex app. It is actually really confusing and there are many discussions on reddit.

First, the app was called Codex, then they combined them and now the app is called chatGPT, but recently inside the app you can switch between ChatGPT and Codex. lol.

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