TL;DR: The model string gemini-3.1-ultra really is inside Google’s Antigravity CLI (agy) version 1.3.1, and it was not there in version 1.1.21. But the model is not available to use yet. It doesn’t show up in agy models, and the CLI rejects it if you try to select it. It shows up one week after Google announced Gemini 4 Argon, and it’s the first time “Ultra” has appeared as a Gemini model name since Gemini 1.0.
The claim
A post on X said that gemini-3.1-ultra “just showed up” in the Antigravity CLI 1.3.1 binary and wasn’t in the previous build. The source was a binary audit of google-antigravity/antigravity-cli. Since that GitHub repository holds only documentation, there’s no source code to check. The only way to verify the claim is to look inside the shipped binary. So we did.
How we checked
Our test machine is Windows 11 with Antigravity CLI installed at %LOCALAPPDATA%\agy\bin\agy.exe. Continue reading “Gemini 3.1 Ultra Is Hiding in Antigravity CLI 1.3.1 — We Checked the Binary”
