Updated April 29, 2026
Both tools run several agents at once, which is unusual enough that it's worth saying where they differ. Antigravity is a VS Code fork with a Manager View for dispatching agents across the editor, terminal, and browser, so the orchestration is something you watch happen in a UI. OpenCode runs planner and builder sessions in parallel from the terminal, and you keep track of them the way you keep track of any other processes you started.
The models are the sharper split. Antigravity is built around Gemini 3 with some third-party model support, and it's free during preview with rate limits that tighten under heavy use. OpenCode connects to 75+ providers through Models.dev and expects you to bring your own keys, which costs more to set up and leaves you holding the provider relationship.
That last part matters more than it sounds. A preview product's limits and pricing can change, and a BYOK setup can lose a model when an upstream provider changes its terms. Either way, the thing you're choosing is who controls model access, not just which editor you prefer.
Google Antigravity is Google's agentic development platform, announced alongside Gemini 3 in late 2025. Built as a modified VS Code fork, it combines a traditional AI-powered editor with a Manager View for orchestrating multiple autonomous agents working in parallel across workspaces. Agents can plan, execute, and verify complex tasks across editor, terminal, and browser. Antigravity achieved 76.2% on SWE-bench Verified and supports Gemini 3 Pro, Deep Think, and Flash models, plus third-party models like Claude.
OpenCode is an open-source AI coding agent for the terminal, IDE, and desktop with 75+ LLM providers. Compare its Zen and Go pricing, pros, and cons.
Core capabilities each platform advertises.
What each tool does well, and the limitations to keep in mind.
Pros
Cons
Pros
Cons
It was the first time I felt like I could write up a large prompt, walk away from my laptop, and come back to a lot of work having been done.
Read full reviewChoose Google Antigravity if you wantChoose if you want
Choose OpenCode if you wantChoose if you want
Respan traces every LLM call and tool run as one nested trace, so a failed run resolves to the step that caused it. Errors surface on the span, with input, output, latency, and cost attached to each one.
Try Respan free