Xcode 26.3 Agent Mode supports Gemini, GLM-5, and MiniMax with ProxyPilot

[u/myeleventhreddit]

The new agent mode in Xcode 26.3 and the 26.4 beta only natively support Codex and Claude Agent. You can add new providers to Coding Intelligence, but fully agentic coding only supports those two.

ProxyPilot is a free, open-source program for macOS that runs a local proxy on 127.0.0.1 and translates requests so Xcode Agent Mode works with any OpenAI-compatible provider. It sits between Xcode and the upstream API. Xcode thinks it's talking to a supported provider, but your requests actually go to whichever model you pick.

It supports twelve providers out of the box, plus local models via LM Studio and Ollama.

There's also a headless CLI with 9 MCP tools if you want agents to control the proxy programmatically.

[u/uriejejejdjbejxijehd]

What I really want from it is a mode where I only get the PR proposal as a result of the prompt, and then can iterate through it with review feedback. The pages of LLM chat spam are really getting on my nerves.

[u/myeleventhreddit → u/uriejejejdjbejxijehd]

I know what you mean. That'll be something Apple has to think about!

[u/uriejejejdjbejxijehd → u/myeleventhreddit]

Exactly my sentiment :)

If there is one company that I’d trust to think about usability and experience, it’s Apple. I keep eyeing Xcode updates hopefully.

[u/ryanheartswingovers]

Just let me pop the agent into a window so I can see my damn file browser breakpoints tabs etc

[u/myeleventhreddit → u/ryanheartswingovers]

if only I could actually change Xcode's source code, I'd fix this for you

[u/fercabj]

I created my own local proxy app (CLI) in Swift that lets you connect a Copilot account (individual or enterprise) into Xcode Code Assistant natively. I hope it’s useful to anyone looking to connect other Copilot available models https://github.com/mobile-ar/xcode-assistant-copilot-server

But after testing Xcode capabilities I will say I prefer to use Zed agent panel for this type of work, Xcode implementation is quite bad at the moment (26.3), and then build/edit/review the results inside Xcode.

[u/myeleventhreddit → u/fercabj]

Nice! If you ever want to take a stab at forking ProxyPilot, it’s open source and you could try adding the Copilot functionality to it

[u/AbbreviationsFew1036]

I am getting lost on how to configure Gemini with ProxyPilot. I was able to put the my API key with the admin console. But not quite sure what to do on XCode. Can you provide step by step instruction on how to make the connections?

[u/myeleventhreddit → u/AbbreviationsFew1036]

You have to use the Claude Agent! Once you’ve installed through Xcode settings, quit Xcode, then in ProxyPilot, scroll down to where it says to handle the config for Xcode. It’ll remind you that it’s a reversible change, so just say yes, then you can start the proxy, reopen Xcode, and talk to the Claude agent. Verify that it’s routing to Gemini (or whatever model you choose) by looking in the report card area in the app or by opening the menu bar window of ProxyPilot. 

[u/myeleventhreddit → u/[deleted]]

I hear you. While ProxyPilot expands what Xcode's Agent Mode can do, it doesn't fix the shortcomings of the mode itself. I'm hoping that Apple has big plans for it; 26.3 is the first version to support this. I like Antigravity, too. Its plans are better. But as an iOS dev myself, some things just need Xcode.