Google's Gemini 4 Hydrogen beats its own frontier model while running 2.5x faster

Google's Gemini 4 Hydrogen is a speed-and-efficiency model for everyday coding and agentic work, priced flat at $1.50 per million input tokens and $7.50 per million output tokens across a 1-million-token context. It edges out Gemini 4 Argon on the Artificial Analysis Intelligence Index (51 vs. 50 at default, 54 at xhigh), triples Terminal-Bench 4.1 scores over 3.8 Flash, and powers a new Antigravity Orchestrator that switches between models mid-session.