oh-my-opencode-slim/docs/antigravity.md

Antigravity Setup Guide

Quick Setup

1. Install with Antigravity support:

   bunx oh-my-opencode-slim install --antigravity=yes
   

2. Authenticate:

   opencode auth login
   # Select "google" provider
   

3. Start using:

   opencode
   

How It Works

The installer automatically:

• Adds opencode-antigravity-auth@latest plugin
• Configures Google provider with all Antigravity and Gemini CLI models
• Sets up Antigravity-focused agent mapping presets

Models Available

Antigravity Models (via Google Infrastructure)

1. antigravity-gemini-3.1-pro

   • Name: Gemini 3.1 Pro (Antigravity)
   • Context: 1M tokens, Output: 65K tokens
   • Variants: low, high thinking levels
   • Best for: Complex reasoning, high-quality outputs

2. antigravity-gemini-3-flash

   • Name: Gemini 3 Flash (Antigravity)
   • Context: 1M tokens, Output: 65K tokens
   • Variants: minimal, low, medium, high thinking levels
   • Best for: Fast responses, efficient agent tasks

3. antigravity-claude-sonnet-4-5

   • Name: Claude Sonnet 4.5 (Antigravity)
   • Context: 200K tokens, Output: 64K tokens
   • Best for: Balanced performance

4. antigravity-claude-sonnet-4-5-thinking

   • Name: Claude Sonnet 4.5 Thinking (Antigravity)
   • Context: 200K tokens, Output: 64K tokens
   • Variants: low (8K budget), max (32K budget)
   • Best for: Deep reasoning tasks

5. antigravity-claude-opus-4-5-thinking

   • Name: Claude Opus 4.5 Thinking (Antigravity)
   • Context: 200K tokens, Output: 64K tokens
   • Variants: low (8K budget), max (32K budget)
   • Best for: Most complex reasoning

Gemini CLI Models (Fallback)

1. gemini-2.5-flash

   • Name: Gemini 2.5 Flash (Gemini CLI)
   • Context: 1M tokens, Output: 65K tokens
   • Requires: Gemini CLI authentication

2. gemini-2.5-pro

   • Name: Gemini 2.5 Pro (Gemini CLI)
   • Context: 1M tokens, Output: 65K tokens
   • Requires: Gemini CLI authentication

3. gemini-3-flash-preview

   • Name: Gemini 3 Flash Preview (Gemini CLI)
   • Context: 1M tokens, Output: 65K tokens
   • Requires: Gemini CLI authentication

4. gemini-3.1-pro-preview

   • Name: Gemini 3.1 Pro Preview (Gemini CLI)
   • Context: 1M tokens, Output: 65K tokens
   • Requires: Gemini CLI authentication

Agent Configuration

When you install with --antigravity=yes, the preset depends on other providers:

antigravity-mixed-both (Kimi + OpenAI + Antigravity)

• Orchestrator: Kimi k2p5
• Oracle: OpenAI model
• Explorer/Librarian/Designer/Fixer: Gemini 3 Flash (Antigravity)

antigravity-mixed-kimi (Kimi + Antigravity)

• Orchestrator: Kimi k2p5
• Oracle: Gemini 3.1 Pro (Antigravity)
• Explorer/Librarian/Designer/Fixer: Gemini 3 Flash (Antigravity)

antigravity-mixed-openai (OpenAI + Antigravity)

• Orchestrator: Gemini 3 Flash (Antigravity)
• Oracle: OpenAI model
• Explorer/Librarian/Designer/Fixer: Gemini 3 Flash (Antigravity)

antigravity (Pure Antigravity)

• Orchestrator: Gemini 3 Flash (Antigravity)
• Oracle: Gemini 3.1 Pro (Antigravity)
• Explorer/Librarian/Designer/Fixer: Gemini 3 Flash (Antigravity)

Manual Configuration

If you prefer to configure manually, edit ~/.config/opencode/oh-my-opencode-slim.json (or .jsonc) and add a pure Antigravity preset:

{
  "preset": "antigravity",
  "presets": {
    "antigravity": {
      "orchestrator": {
        "model": "google/antigravity-gemini-3-flash",
        "skills": ["*"],
        "mcps": ["websearch"]
      },
      "oracle": {
        "model": "google/antigravity-gemini-3.1-pro",
        "skills": [],
        "mcps": []
      },
      "explorer": {
        "model": "google/antigravity-gemini-3-flash",
        "variant": "low",
        "skills": [],
        "mcps": []
      },
      "librarian": {
        "model": "google/antigravity-gemini-3-flash",
        "variant": "low",
        "skills": [],
        "mcps": ["websearch", "context7", "grep_app"]
      },
      "designer": {
        "model": "google/antigravity-gemini-3-flash",
        "variant": "medium",
        "skills": ["agent-browser"],
        "mcps": []
      },
      "fixer": {
        "model": "google/antigravity-gemini-3-flash",
        "variant": "low",
        "skills": [],
        "mcps": []
      }
    }
  }
}

Troubleshooting

Authentication Failed

# Ensure Antigravity service is running
# Check service status
curl http://127.0.0.1:8317/health

# Re-authenticate
opencode auth login

Models Not Available

# Verify plugin is installed
cat ~/.config/opencode/opencode.json | grep antigravity

# Reinstall plugin
bunx oh-my-opencode-slim install --antigravity=yes --no-tui --kimi=no --openai=no --tmux=no --skills=no

Wrong Model Selected

# Check current preset
echo $OH_MY_OPENCODE_SLIM_PRESET

# Change preset
export OH_MY_OPENCODE_SLIM_PRESET=antigravity
opencode

Service Connection Issues

# Check if Antigravity service is running on correct port
lsof -i :8317

# Restart the service
# (Follow your Antigravity/LLM-Mux restart procedure)
# Or edit ~/.config/opencode/oh-my-opencode-slim.json (or .jsonc)
# Change the "preset" field and restart OpenCode

Notes

• Terms of Service: Using Antigravity may violate Google's ToS. Use at your own risk.
• Performance: Antigravity models typically have lower latency than direct API calls
• Fallback: Gemini CLI models require separate authentication but work as fallback
• Customization: You can mix and match any models across agents by editing the config