Google migrates 174k-line Fortran ocean model to Rust in 59 minutes with Gemini 4 Argon
gaganghotra_ · x · 2026-11-04
Google's Antigravity team detailed how it used Gemini 4 Argon to migrate the core of a 40-year-old, 174,000-line Fortran coastal ocean model into 100% memory-safe Rust.
- The end-to-end migration ran in 59 minutes, driven by the agent
- Six decades-old bugs were caught along the way
- Memory usage was cut in half and simulations sped up 1.88x
- The workflow is being released as an open-source skill
- Positioned as a showcase of Antigravity's long-horizon engineering: the agent handled the whole migration, not just line suggestions
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