Google Adds Orchestrator to Antigravity for AI Ultra Subscribers

Google began rolling out Orchestrator in Antigravity to Google AI Ultra subscribers on Nov. 12, adding a two-model workflow to its coding platform that used less quota while delivering similar benchmark success rates.

In early Terminal-Bench 4.1 results, Orchestrator had success rates comparable to Gemini 4 Carbon working alone. The workflow used 24% less quota and completed tasks 19% faster on average.

A single Antigravity session can shift work between models as a task progresses. Carbon handles planning and reviews the output, while Hydrogen writes and tests code. Orchestrator routes work between them, so developers do not have to change models manually as a task moves from planning to implementation. The models have different roles: Carbon is designed for higher-level planning and review, while Hydrogen is tuned for faster execution.

Orchestrator is available through Antigravity’s desktop apps, command-line interface and IDE extensions. Access is limited to Google AI Ultra subscribers. Ultra tiers that include Carbon and Orchestrator cost between $99.99 and $199.99 per month. Google AI Pro costs $19.99 per month and includes Argon and Hydrogen, but not Carbon or Orchestrator. Hydrogen access is gradually opening to Pro and Ultra subscribers.

Google launched Carbon on Nov. 10, then expanded Carbon access through its Gemini API the next day, opening the model to developers and enterprise customers. The Carbon launch also included a preview of /swarm, a separate multi-agent feature. Antigravity first launched in May 2026 and has added specialized models for different software development tasks.