Google Antigravity and Windsurf are among the most fascinating comparisons in the AI IDE market of 2026 — not just because they compete, but because they share the same codebase origin. Antigravity was built by Google using Windsurf's codebase as a foundation, and understanding that history is key to deciding which tool is right for you.
The Origin Story — From Windsurf to Antigravity
In July 2025, Google signed a licensing agreement with the Windsurf development team. CEO Varun Mohan and the core engineering team joined Google DeepMind, bringing Windsurf's code assets with them to build a new IDE. The result was Google Antigravity, released on November 18, 2025.
Meanwhile, Windsurf's remaining assets were acquired by Cognition AI — the company behind the AI coding agent Devin. Today's Windsurf continues development under Cognition AI's umbrella.
With this context, Antigravity can be seen as an "evolved Windsurf," though it has taken a distinctly different direction built around Google's infrastructure and the Gemini model family.
Side-by-Side Specs
| Feature | Antigravity | Windsurf |
|---|---|---|
| Developer | Google DeepMind | Cognition AI |
| Base Editor | VS Code fork | VS Code fork |
| Primary AI Model | Gemini 3.1 Pro / Flash | Cascade (proprietary) |
| External Model Support | Claude, GPT-OSS-120B | Limited |
| Multi-Agent | ◎ (Manager Surface) | △ (limited) |
| Plugin Support | Standalone IDE only | VS Code / JetBrains / Vim |
| Pricing | Free preview (~$20/mo Pro expected) | $15/mo (Pro plan) |
| Enterprise Readiness | Preview stage | SOC 2 Type II certified |
| Stability | In development (known bugs) | Production-ready |
Feature Comparison
Agent Capabilities
Antigravity's standout feature is the Manager Surface, which enables parallel execution of multiple AI agents. One agent can write code while another searches documentation or runs tests simultaneously — a powerful capability for distributing large tasks efficiently.
Windsurf's Cascade agent leverages RAG (Retrieval-Augmented Generation) based codebase indexing to deeply understand existing code before generating new code. As a single-agent system, it excels at stability and contextual accuracy.
Antigravity's edge: Parallel multi-agent processing for large-scale projects Windsurf's edge: Deep understanding of existing codebases with stable execution
Artifacts for Transparency
Antigravity makes agent work transparent through Artifacts — tangible deliverables like task lists, implementation plans, screenshots, and browser recordings generated during agent execution. You can leave feedback directly on Artifacts, similar to commenting on a document, and the agent incorporates your input without stopping its flow.
Windsurf has no equivalent feature; agent progress is primarily tracked through the chat interface.
Planning Mode vs Fast Mode
Antigravity offers two distinct operation modes.
Planning mode has agents create a plan before execution, generating walkthroughs and task lists with opportunities to intervene at each step. This is ideal for high-risk tasks or large-scale changes where oversight matters.
Fast mode executes commands directly, making it best for quick experiments and tasks with limited scope.
Windsurf has similar concepts in "Chat" (interactive) and "Write" (autonomous) modes, but the distinction isn't as explicit as Antigravity's mode switching.
AI Model Choices
Antigravity supports Gemini 3.1 Pro (primary model), Gemini 3 Flash (fast/low-cost), plus Claude Sonnet 4.6, Claude Opus 4.6, and GPT-OSS-120B. Remarkably for a Google IDE, it embraces competitor models with notable openness.
Windsurf centers around its proprietary Cascade model with limited external model support — fewer choices than Antigravity.
Stability and Maturity
The biggest gap between the two tools right now is stability.
Antigravity is still relatively young since its November 2025 launch, with a reported security vulnerability (backdoor attack risk) and various bugs under active investigation by Google. There's also a known issue where the C# Dev Kit detects the VS Code fork and refuses to load, making Antigravity impractical for .NET development without significant workarounds.
Windsurf holds SOC 2 Type II certification and has enterprise adoption track records. In stability and reliability, Windsurf leads by a significant margin.
Plugin Ecosystem and Extensibility
Windsurf provides plugins for VS Code, JetBrains IDEs, and Vim/Neovim, allowing integration with your existing development environment. Teams mixing VS Code and JetBrains users can share the same AI assistant seamlessly.
Antigravity currently offers only a standalone IDE with no plugins. For flexibility in integrating with existing workflows, Windsurf has the clear advantage.
Pricing
Windsurf Pro is available at $15/month, widely regarded as good value for a stable, production-ready service.
Antigravity is currently free during public preview. However, given the high compute costs of Gemini 3, Google is expected to introduce paid plans in 2026 — likely an individual free tier (with rate limits), Pro (~$20/month), and Enterprise (~$40–60/user/month).
Which Should You Choose?
Choose Antigravity if you:
- Are an individual developer or experimenter who loves cutting-edge tools
- Need parallel multi-agent processing for large tasks
- Want deep Gemini model integration in your workflow
- Want to use it free (during the preview period)
- Are an early adopter eager to experience the future of AI development
Choose Windsurf if you:
- Need stable, production-ready operation for critical projects
- Want to integrate with existing IDEs (VS Code, JetBrains)
- Must meet enterprise security requirements (SOC 2 Type II)
- Prioritize predictable, reliable behavior on your development team
- Use .NET / C# as your primary language
Looking back
Antigravity and Windsurf share the same origin but have taken different paths. Antigravity harnesses Google's technical power and multi-agent capabilities to push the frontier of AI development, while Windsurf builds on stability and ecosystem integration for production adoption.
For individual developers and experimental projects, Antigravity's free preview is well worth exploring. For team development and production services, Windsurf's stability is a significant advantage at this stage.
As Antigravity's stability and feature set mature, this comparison will likely shift considerably. Watch for major updates in the second half of 2026.