Google Antigravity is adding Gemini 4 Hydrogen for everyday coding and agentic tasks, alongside Orchestrator, a model option that combines Hydrogen with the more capable Gemini 4 Carbon. The central argument is that coding work changes in complexity as it unfolds, so a fixed model choice based on the initial prompt can be inefficient. Orchestrator instead shifts between models during a task: Carbon can investigate dependencies, resolve uncertainty, and plan; Hydrogen can make edits, update packages, and test; and Carbon can take over again if execution stalls, revise the plan, and guide the work forward.
On Terminal-Bench 4.1, Orchestrator achieved task success rates close to Carbon’s while using 24% less quota on average and finishing 19% faster. Developers who need direct control can use the Antigravity SDK to assign roles explicitly - for example, Hydrogen agents can triage issues and handle routine code changes, while Carbon tackles major refactors, features, and security reviews. Hydrogen is also available on its own, with adjustable reasoning across four levels. It scored 51 on the Artificial Analysis Intelligence Index, rising to 54 at its highest setting, and 57% on Terminal-Bench 4.1. Hydrogen is rolling out to paid Google AI Pro and Ultra subscribers; Orchestrator is initially for Ultra subscribers. Businesses can access both through Gemini for business.
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