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Setting Up Xcode Claude Code with Third-Party API Endpoints

This guide explains how to configure Xcode's built-in Claude Code integration to work with third-party API endpoints instead of the official Anthropic API.

Step 1: Bypass the Authentication UI

Xcode normally requires signing in through the UI with an Anthropic account or API key and doesn't offer any bypass. Even if the Xcode internal claude can use your third-party endpoint Xcode won't send any query because YoU ARe NOt LOgGeD IN. To bypass this when using a third-party endpoint, set a placeholder API key override, which you cannot do through the UI:

defaults write com.apple.dt.Xcode IDEChatClaudeAgentAPIKeyOverride ' '

Xcode Defaults

Command Line

# Enable internal menu
defaults write com.apple.dt.Xcode ShowDVTDebugMenu -bool YES

# Enable project build time

	services:
	litellm:
	image: ghcr.io/berriai/litellm:main-latest
	container_name: glm-proxy
	ports:
	- "4000:4000"
	volumes:
	- ./litellm_config.yaml:/app/config.yaml
	command: --config /app/config.yaml
	restart: unless-stopped

	// Copyright © 2023 Alex Kovács. All rights reserved.

	import ArgumentParser
	import Foundation
	import PathKit
	import XcodeProj

	// See below for `MainCommand` skeleton.
	extension MainCommand {
	struct XcodeCommand: ParsableCommand {

	/// MIT License
	///
	/// Copyright (c) 2021 Lukas Kubanek, Structured Path GmbH
	///
	/// Permission is hereby granted, free of charge, to any person obtaining a copy
	/// of this software and associated documentation files (the "Software"), to deal
	/// in the Software without restriction, including without limitation the rights
	/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	/// copies of the Software, and to permit persons to whom the Software is
	/// furnished to do so, subject to the following conditions:

	//
	// CardPagingLayout.swift
	//
	// Created by Ahmed Fathi on 5/29/20.
	// Copyright © 2020 Ahmed Fathi. All rights reserved.
	//

	import UIKit

	class CardPagingLayout: UICollectionViewLayout {

	import UIKit

	extension UIApplication {

	// MARK: Public
	func isRunningInTestFlightEnvironment() -> Bool {
	if isSimulator() {
	return false
	} else {
	if isAppStoreReceiptSandbox() && !hasEmbeddedMobileProvision() {

	// Original: https://gist.github.com/loudmouth/332e8d89d8de2c1eaf81875cfcd22e24
	import Foundation

	private struct JSONCodingKeys: CodingKey {
	var stringValue: String

	init(stringValue: String) {
	self.stringValue = stringValue
	}

	// Generated using SwiftGen, by O.Halligon — https://github.com/SwiftGen/SwiftGen

	{% if tables.count > 0 %}
	{% set accessModifier %}{% if param.publicAccess %}public{% else %}internal{% endif %}{% endset %}
	import Foundation

	// swiftlint:disable superfluous_disable_command
	// swiftlint:disable file_length
	{% macro parametersBlock types %}{% filter removeNewlines:"leading" %}
	{% for type in types %}

	# Customise this file, documentation can be found here:
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	# Change the syntax highlighting to Ruby
	# All lines starting with a # are ignored when running `fastlane`

	# If you want to automatically update fastlane if a new version is available:
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