Google's Orchestrator hands tasks between two Gemini 4 models to save quota
Gemini 4 Hydrogen and Orchestrator
Google Antigravity now offers Gemini 4 Hydrogen, a standalone coding model scoring 51 on the Artificial Analysis Intelligence Index and 57% on Terminal-Bench 4.1. A new Orchestrator option pairs Hydrogen with Gemini 4 Carbon, passing work back and forth mid-trajectory: Carbon plans, Hydrogen edits and tests, and Carbon repairs the plan when Hydrogen stalls. On Terminal-Bench 4.1, Orchestrator matched Carbon's success rate while using 24% less quota and finishing 19% faster.
If Hydrogen hits friction, it would hand back to Carbon to inspect the state, repair the plan, and resume execution.