In-gen

Latest release · Public beta

In-gen 1.0.0-beta.20

November 13, 2026 · Windows installer · 577 MB

Download In-gen Free

Free, with no sign-up. The installer comes straight from In-gen's public release repository on GitHub.

What's new

Pick your agents on first launch, Claude Fable 5.2, Antigravity, and a cheaper Harmony.

  • Set up your agents: the first time In-gen opens, tick the agents you use (Claude, OpenAI, Gemini, Antigravity) and choose how each connects: your subscription, an API key, or MCP so the agent drives In-gen from its own window. In-gen then signs in, checks the key, or registers itself and tests the connection, one at a time. Skip it now and run it later from Agent > Set Up Agents...
  • Claude Fable 5.2 is in the model picker for both the Claude subscription and the API key. The API key models are now Opus 5.5, Sonnet 5.5 and Haiku 5.5.
  • Google Antigravity works as an in-app agent with In-gen's tools, or as an external agent over MCP.
  • Fixed: external agents over MCP (Claude Code, Codex) could not see what In-gen's tools returned. They now get the full result.
  • Harmony uses noticeably less of your plan per job: its instructions stay the same between messages so they are cached, it no longer loads your claude.ai connectors, and its screenshots are sized like the MCP ones. A resumed conversation also sees the editor as it is now, not as it was when the chat began.
  • Fixed: long conversations on an Anthropic API key could fail to write their summary.
  • Runtime geometry can use a glow picture (emissiveMap), so signs and screens light up as a picture at night instead of a flat colour.

Your projects and settings are not touched.

This release on GitHub ↗ · Every release ↗

Install

  1. Download the installer with the button above. It's one file, In-gen-Setup-1.0.0-beta.20.exe.
  2. Run it. If Windows SmartScreen says it protected your PC, choose More info, then Run anyway. The installer isn't code-signed yet.
  3. Choose whether to install for just you or everyone on the PC, and where. In-gen adds a desktop and Start menu shortcut.
  4. Open In-gen and connect Harmony to your AI provider. Start a new project or open one you have.

Updates

In-gen checks for new versions itself and asks before it installs one. Every update's file list is signed, and each installer is checked against it before it runs. Your projects and settings are kept.

What's in In-gen

Harmony

  • An AI partner built into the editor that edits scenes, Systems and data, and plays back its work to check it.
  • Bring Claude, ChatGPT, Gemini or Antigravity, or drive In-gen from Claude Code and Codex over MCP.

Game logic as data

  • Rules live in Systems with plain descriptions and the sheets they read, so you can tune a game yourself.
  • Terrain, water, sky, animation, audio and post-processing, all editable in panels.

Build and share

  • Build a Windows game or a web version that plays in the browser.
  • Built on three.js with WebGPU and WebGL2, Rapier physics and Recast navigation. More on the tech.