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AMP Free Tier + Local OAuth Fallback Guide

Use AMP's free $10/day grant first. When exhausted, switch to your own subscriptions (Claude, Gemini, Codex, GitHub Copilot, Kiro, etc.) — all from within AMP CLI. No restart needed.

Prerequisites: Add Prefer-Upstream Feature

CLIProxyAPI / CLIProxyAPIPlus doesn't include the prefer-upstream feature out of the box. You need to add it first.

Drop IMPLEMENT-PREFER-UPSTREAM.md into your AI coding agent (Claude Code, AMP, Cursor, etc.) and ask it to implement the changes. It's 7 small edits that follow the existing ForceModelMappings pattern.

	/**
	* Wraps a promise and returns a tuple where the first element is the data if successful,
	* or null if an error occurred, and the second element is the error if any, or null if successful.
	*
	* @param promise The promise to wrap.
	* @returns A promise that resolves to [data, null] on success or [null, error] on failure.
	*/
	export async function tryCatch<T, E = Error>(promise: Promise<T>): Promise<[T, null] \| [null, E]> {
	try {
	const data = await promise;

	{
	"custom_models": [
	{
	"model_display_name": "GPT 5.2 Medium",
	"model": "gpt-5.2(medium)",
	"base_url": "http://localhost:8317/v1",
	"api_key": "dummy-not-used",
	"provider": "openai"
	},
	{