Gemini 4 Carbon and /swarm

Today, we’re rolling out Gemini 4 Carbon inside Google Antigravity alongside /swarm (in preview), pairing our strongest model for long-horizon software engineering, knowledge work, scientific discovery, and cybersecurity with native multi-agent team orchestration.

Put Gemini 4 Carbon to work with /swarm

Working with a single agent works well for scoped tasks, but breaks down when a change spans dozens of files and test suites. Dynamic subagents evolved that into a primary agent spinning off isolated helper agents: powerful for delegating one-off tasks, but still bottlenecked by a single coordinator context reviewing, synthesizing, and routing every step. With /swarm, working with Antigravity turns into orchestrating a coordinated system of specialized agents that plan, build, and verify in parallel.

Instead of brittle hierarchical chains where context degrades, /swarm passes your prompt to a family of agents: a coordinator that spins up specialized parallel workers in isolated git worktrees so edits never collide, and adversarial verifiers dedicated to running tests and challenging diffs. Every agent collaborates directly on a shared, append-only message board, parking at zero token cost when idle and activating the instant an agent needs input.

To keep multi-agent execution transparent rather than an opaque black box, /swarm ships with a built-in Swarm UI in Antigravity’s side pane (and a live full-screen terminal board via /swarm board or Alt+S in the CLI):

• Live Board, Roster, and Graph replay: Watch your agent team debate trade-offs in real time on the Board feed, inspect live tool activity or jump into any agent’s trajectory from the Members roster to steer it, and scrub through the interactive Graph timeline to see how the team converged from initial brief to verified code.

• Right-sized multi-model teams with Gemini 4 Carbon: Because agents in a swarm can be pinned to different models, you can match model intelligence to each role. While Gemini 4 Argon remains an ideal choice for most advanced engineering and knowledge work tasks, Carbon is built to explore thoroughly, reason deeply, and run extended verification loops using more tokens (ranking #1 on CursorBench 4.0 and Perplexity’s WANDR). That makes Carbon ideal for high-leverage coordinator, architecture, cybersecurity auditing, and adversarial verification roles while lighter, faster models handle the parallel file edits and routine implementation tasks.

Inside Google, in five weeks of internal dogfooding of /swarm, Google engineers ran swarms to tackle gnarly multi-package migrations, cross-subsystem root-cause investigations, and complex architectural redesigns. (As a fair warning, even with zero-token idle waits and dynamic model hot-swapping, parallel multi-agent systems consume quota much faster than a standard chat.)

Getting started

When your ambition outgrows a single conversation, /swarm with Gemini 4 Carbon puts an entire multi-agent team behind your keyboard. Starting today, Google AI Ultra subscribers can build with Gemini 4 Carbon in the Antigravity App, the Antigravity CLI, and Antigravity IDE extensions, and /swarm is rolling out today in preview across the Antigravity App and CLI. Enterprises can access Gemini 4 Carbon in Gemini for business, and scientists and researchers can apply for a chance to get access to both Argon and Carbon via Antigravity’s highest usage tier free of charge for 6 months.