Google adds Orchestrator to Antigravity coding tools

Google Antigravity announced Gemini 4 Hydrogen and a new model-selector option called Orchestrator on November 12, 2026.[1] Google says Orchestrator combines Hydrogen with stronger models, including Gemini 4 Carbon, to balance quality, efficiency and latency.[1] It can switch dynamically in either direction between Carbon and Hydrogen as one task develops.[1] Google presents the option for everyday feature work and debugging within a single session.[1] The company says using a frontier reasoning model with multiple parallel agents for every routine step can slow iteration and consume frontier-model quota; it also says longer tasks can become difficult when their complexity changes.[1]

In Google’s example, Carbon investigates dependencies, resolves ambiguities and plans before Hydrogen takes over implementation and testing.[1] If Hydrogen encounters friction, Google says Carbon can take control again, inspect the state, repair the plan and resume execution.[1] On Terminal-Bench 4.1, Google reports that Orchestrator achieved near-Carbon task success while using 24% less quota on average and finishing 19% faster.[1] That is a company-reported result on a named benchmark; it does not establish how the approach will perform on every team’s code or workflow.[1] Teams assessing it can treat the result as a comparison to investigate against their own tasks and constraints.

Google says Gemini 4 Hydrogen is rolling out to paid Google AI Pro and Ultra subscribers.[1] Orchestrator (Carbon) and Orchestrator (Argon) are rolling out to Ultra subscribers, while paid Pro subscribers get Orchestrator (Argon).[1] Enterprises can access Hydrogen and Orchestrator through Gemini for business, according to Google.[1] For teams that want fixed assignments rather than automatic switching, the Antigravity SDK can assign Hydrogen and Carbon to specific roles programmatically.[1] Google’s SDK demonstration uses Hydrogen agents to triage and code incoming issues, search code, ask clarifying questions and iterate on interface changes from pull-request comments; Carbon handles larger refactors, new features and security checks.[1] Google says it plans to support additional models and subscription plans in the future.[1]