Gemini 4 Hydrogen

Google’s new Gemini Decisions API offers fast, closed‑set decision making for routing, policy checks, and model selection, illustrated with a customer‑support ticket triage example. The article compares five models—Gemini 3.8 Flash, Gemini 4 Hydrogen, Gemini 3.5 Flash‑Lite, and Gemma 4 E2B—on accuracy, speed, and cost. It also notes upcoming model replacements for gemini‑2.5‑pro and gemini‑2.5‑flash on Dec 1 2026.