GenieEngine is an AI-powered game engine that lets you build commercial-quality video game with AI. Games are real Godot 4 projects under the hood, and the AI assistant is powered by OpenAI's Codex agent. Everything — the engine, git, and the AI agent — ships inside the app, so there's nothing to install or configure beyond an API key.
GenieEngine is capable of creating commercial-grade games. Play demo here.
GenieEngine is completely free and open source under the permissive GPLv3 license. No strings attached, no royalties. Games you create are yours. We follow the very permissive Open Source model of Godot, which is a key technology that enables GenieEngine.
| Platform | Download |
|---|---|
| macOS (Apple Silicon & Intel) | OpenGenie.dmg |
| Windows | OpenGenie-Setup.exe |
| Linux | OpenGenie.AppImage |
Claude Code and Codex are excellent general-purpose coding agents — but they assume you already have a dev environment, are comfortable in a terminal, can easily create art assets, and can wire up a game engine and an export process yourself. GenieEngine uses that same class of AI agent, but packages it for one job: making a game.
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The AI tests its own work — through a built-in MCP harness, the assistant can run the game off-screen, send scripted input, take screenshots, and query game state — so it catches broken changes before telling you it's done, instead of you finding out later. You spend less time debugging, and more time in the creative process.
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Art, not just code — 2D and 3D asset generation is built into the same chat, so sprites, icons, and models land straight in your project alongside the code that uses them. Note: I plan to add audio (music and sound effects) generation in the future as well.
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One-click export — ship to all six Godot platforms without touching an export pipeline yourself (MacOS, Linux, Windows, iOS, Android, Web).
Claude Code is the right tool if you're a developer who wants an agent inside your existing workflow. GenieEngine is for anyone who wants to make a game, with the same caliber of AI doing the work end-to-end.
Install GenieEngine and open it. From the welcome screen, click New Game.
On first launch, GenieEngine shows a Connect your AI assistant screen (reopen it any time via the gear icon in the title bar). It has three tabs:
Models — required; the model slots that power the assistant. Each slot takes an API
endpoint that speaks the OpenAI Responses API (defaults to OpenRouter,
https://openrouter.ai/api/v1), a Model, an API key, and Thinking / Reasoning
effort settings. Keys are stored locally by GenieEngine and never exposed to the assistant itself. Grab a key from
openrouter.ai/keys and paste it into the Medium slot — the Large slot
reuses it if you leave its key blank. Both models must accept image input: the assistant reads the
images you attach and play-tests your game with screenshots itself. Recommended setup:
| Slot | What it does | Recommended model | Thinking | Reasoning effort |
|---|---|---|---|---|
| Chat model — Medium | The everyday model that plans and writes your game's code | deepseek/deepseek-v4.1-flash |
Enabled | Max |
| Chat model — Large | A heavyweight model for tough tasks — switch to it from the dropdown in the chat box | moonshotai/kimi-k2.7-code |
Enabled | Max |
Asset generation (optional) — two more tabs let the assistant create art straight into your project's assets folder:
| Tab | What it enables | Credentials |
|---|---|---|
| 2D Asset Generation | Sprites, icons, and UI as transparent 1024×1024 PNGs, via OpenAI's gpt-image-1.5 | OpenAI API key from platform.openai.com/api-keys |
| 3D Asset Generation | 3D models, via Tencent's Hunyuan 3D | Tencent SecretId and SecretKey from the Tencent Cloud console, under Access Management (CAM) → API Keys — see Tencent's Hunyuan-to-3D docs |
Skipping a tab just disables that capability; the assistant will explain what it can't do rather than failing silently.
Describe what you want in the chat — the assistant writes the code, and you can hit Run any time to play the current build right in the window. Ask it for art (2D or 3D) too ("give the player a pixel-art sprite").
When you're ready to ship, click Export and pick any combination of Godot's six platforms — Godot's export templates download automatically the first time you export: Windows, macOS, Linux, Web, Android, and iOS.