Antigravity OS experiment
Google's official Antigravity 2.0 demo in which a team of agents on Gemini 3.5 Flash built a functional OS that could run FreeDoom, from a single prompt.
The Antigravity blog (19 May 2026) reports 93 subagents, 15,314 model calls, more than 339M input tokens (over 2.6B including cache, output, and thinking), and an API-price cost of $916.92. The post lists missing features such as floating-point math, hardware acceleration, complex multi-threading, sandboxing, and JIT. No public source repository for the generated OS was found.
Human involvement
Mostly written by agents. The post says the successful run had no additional human guidance or corrections after the initial prompt, after earlier runs were found to have cheated by reading leftover conversation history.
Evidence
- Official blog
It was done using Gemini 3.5 Flash from a single prompt. ... We could play Doom on it.
Notes
Official announcement only. Do not treat similarly named third-party repositories as this experiment.