Agent-first IDE with frontier models at zero cost—if you use it safely.
What Antigravity Is
Google’s AI-native IDE (released November 18, 2025) that runs multiple AI agents simultaneously. Unlike traditional IDEs where you write code, Antigravity agents plan, code, test, and iterate autonomously while you review and guide.
Key differentiator: Access to Claude Opus 4.6 and Gemini 3.1 Pro—frontier models that cost $200+/month elsewhere—during the free public preview.
Models Available
| Model | SWE-Bench Verified | Best For | Context Window |
|---|---|---|---|
| Claude Opus 4.6 | 80.84% | Complex reasoning, architecture | 200K (1M beta) |
| Claude Sonnet 4.6 | 79.6% | Fast, capable daily driver | 200K (1M beta) |
| Gemini 3.1 Pro | 80.6% | Google’s flagship, 1M context | 1,048,576 |
| Gemini 3.1 Flash | ~78% | Speed, cost efficiency | 1,048,576 |
| GPT-OSS 120B | Varies | Open-source alternative | 128K |
Pricing comparison (API, not Antigravity):
- Claude Opus 4.6: $5/$25 per million tokens (input/output)
- Gemini 3.1 Pro: $2/$12 per million tokens (≤200K context); $4/$18 (>200K)
- Claude Sonnet 4.6: $3/$15 per million tokens
Implementation: Setup Steps
1. Download and Install
Visit antigravity.google and download for your platform:
| |
System requirements: 4GB RAM minimum (8GB recommended), 500MB disk space, internet connection.
2. Sign In
Launch Antigravity and sign in with a personal Gmail account (Workspace accounts not supported during preview).
3. Select Your Model
Click the model selector (bottom-right) and choose:
- Claude Opus 4.6 (Thinking) for complex architecture
- Gemini 3.1 Pro for long-context tasks
- Claude Sonnet 4.6 for daily coding
4. Create or Open a Project
- New project: File → New Mission → Describe what you’re building
- Existing codebase: File → Open Folder → Select repository
5. Start Your First Agent
Type in the Agent panel: "Create a React component that displays a
paginated table with sorting and filtering"
The agent will plan, generate code, and present artifacts for your review.
Time to first code: 3-5 minutes.
Free Tier: What You Actually Get
| Feature | Free Tier (Individual Preview) | Paid (Google AI Pro/Ultra) |
|---|---|---|
| Claude Opus 4.6 | ✅ Available | ✅ Higher limits |
| Gemini 3.1 Pro | ✅ Available | ✅ Higher limits |
| Rate limits | ~240 chat / 6,000 code requests/day* | 10x+ higher |
| Agent concurrency | 1 Mission Control workspace | 3 concurrent agents |
| Context window | Full 1M tokens (Gemini) | Full 1M tokens |
| GPU priority | Low (queued during peak) | High priority |
| Code execution | ✅ Yes | ✅ Yes |
| Browser automation | ✅ Yes | ✅ Yes |
*Exact limits vary; Google adjusts during preview. Rolling 5-hour active usage window.
The Catch / Risks
Risk 1: OAuth Ban (CRITICAL)
Using Antigravity OAuth tokens with third-party tools like OpenClaw, OpenCode, or custom CLI scripts is explicitly prohibited under Section 6 of the Additional Terms.
Consequence: Immediate Antigravity suspension (403 ToS error), no warning, 1-2+ week recovery timeline.
Safe path: Use only the official Antigravity IDE, or switch to Gemini API keys for third-party tools.
See Google Antigravity OAuth Risk for full details.
Risk 2: Preview Instability
- Rate limits change without notice
- “Agent terminated due to error” issues reported
- Occasional infinite loading on complex requests
Mitigation: Save work frequently, use git commits, break complex tasks into smaller steps.
Risk 3: Data Handling
Google’s data policies differ from Anthropic’s. Code and prompts are processed through Google’s infrastructure.
Account Safety: The Gmail Risk
Critical clarification: Antigravity suspensions do NOT affect Gmail or other Google services. Google’s ban is surgical—only Antigravity access is blocked.
However, using your primary Google account for AI tools carries account consolidation risk:
“Way too risky to use Google services like this tied to your primary account. There’s too much risk of cross damage. Imagine losing access to your Gmail because some Gemini request flags you as an undesirable.” — Hacker News user, 2026-03-02
Best Practices
Use a secondary Google account
- Create dedicated @gmail.com for AI services
- Forward important emails to primary
- Isolates AI service disputes from core identity
Custom domain email
- Own your email address (not @gmail.com)
- Can migrate providers if Google account affected
Regular Google Takeout
- Monthly exports via google.com/takeout
- Deliver to Drive, sync locally
- Insurance against sudden access loss
Comparison: Free Opus 4.6 & Gemini 3.1 Pro Access
| Tool | Opus 4.6 / Gemini 3.1 Pro | Credit Card | Duration | Best For |
|---|---|---|---|---|
| Antigravity | Free tier | No | Preview period | Sustained free access |
| Kiro | 500 credits | Yes | First month only | One month intensive |
| OpenCode Zen | Moving limited-time free roster (not Opus/Kimi) | Billing setup | Limited-time models | Coding-harness alternative |
Quick Verdict
Related links
Policy & Risk:
- Google Antigravity OAuth Risk — Full risk assessment
- Google AI Policy: OpenClaw Verification — ToS analysis and migration guide
- OpenClaw Provider Policy Check 2026 — Breaking news and enforcement timeline
Value & Alternatives:
- Free Frontier Stack — Complete free tier guide
- Kiro — 500 free credits for first month
- NVIDIA NIM — Free Kimi k2.5 API
- OpenCode Zen — Limited-time free-model alternative; verify the live roster
Model Details:
- Gemini 3 Flash Model Guide — Full specifications
- Claude Opus 4.5 Model Guide — Capabilities and pricing
Last updated: March 3, 2026. Antigravity is in public preview—terms and limits subject to change.