Magpie

Magpie is a free, MIT-licensed desktop app for developers who use several AI coding agents and want to choose the model behind each one. Coding CLIs usually speak a single vendor's API: Codex talks OpenAI Responses, Claude Code talks Anthropic Messages, Gemini CLI talks Google's Gemini API. Magpie runs a gateway on your own machine (127.0.0.1:3425) that understands all of these formats and translates between them in both directions, including streaming, tool calls and reasoning output. That is what lets you point Codex at DeepSeek, Claude Code at Kimi or GLM, or Gemini CLI at Qwen.

You add a provider once, usually by pasting a key, from roughly twenty presets that cover vendors such as DeepSeek, Moonshot (Kimi), Zhipu (GLM), Qwen, MiniMax, Mistral, xAI and Groq, relays such as OpenRouter and AiHubMix, and local servers such as Ollama. Model lists are fetched from each vendor, so newly released models show up after a refresh. Subscriptions you are already signed in to, such as Claude Pro/Max, ChatGPT Plus/Pro and GitHub Copilot, can be reused as providers in other agents without copying tokens. Magpie lists support for dozens of agents, from Claude Code, Codex, Gemini CLI and OpenCode to Goose, Cursor CLI, Copilot CLI and Crush.

The menu bar shows which model each agent is using; changing it rewrites only that key in the agent's own config file, keeping comments and formatting, and choosing the native model restores the original setting. Saved profiles switch every agent at once. Beyond switching, Magpie can route each turn to a model by intent, spread requests across several keys and accounts with quota-aware failover, and mask secrets such as API keys, tokens and card numbers with placeholders before a request leaves your computer, restoring them in the reply. It also tracks tokens, cache hits and cost per agent and model.

Magpie is a native app built on the system webview (about a 15 MB download on a Mac, no Electron) and runs on macOS, Windows and Linux, with a terminal UI and a CLI that offer the same features. Mac builds are signed and notarised and the app updates itself. It is developed in the open on GitHub by yetone.