Google Antigravity

Google Antigravity is an agentic IDE built on VS Code. Its extensions come from the Open VSX registry, and it has an integrated terminal. You can use Apertis models inside Antigravity in two ways. You can install an extension that accepts an OpenAI-compatible endpoint, or you can run a terminal coding agent.

Prerequisites

• Google Antigravity IDE installed, from antigravity.google/download
• A Google account. Antigravity asks you to sign in with Google when it first launches.
• An Apertis API key, from the Apertis Dashboard

Option 1: An extension (Cline or Kilo Code)

Step 1: Install the extension

1. In Antigravity, open the Extensions view: Cmd+Shift+X on macOS, Ctrl+Shift+X on Windows and Linux.
2. Search for Cline (publisher saoudrizwan) or Kilo Code (publisher kilocode).
3. Click Install.

To install from the command line instead, run Antigravity's antigravity-ide command. On macOS it is at Antigravity IDE.app/Contents/Resources/app/bin/antigravity-ide.

antigravity-ide --install-extension saoudrizwan.claude-dev   # Cline
antigravity-ide --install-extension kilocode.kilo-code       # Kilo Code

Step 2: Point it at Apertis

Open the extension's settings and enter these values.

The Cline and Kilo Code pages show each extension's settings screens.

Step 3: Choose a model

Enter any model ID from the Model List. For example:

Option 2: A terminal coding agent

Open Antigravity's integrated terminal (Terminal → New Terminal). Then run any coding agent that you have configured for Apertis:

• Claude Code
• OpenCode
• OpenAI Codex CLI

The agent edits files in the workspace that is open in Antigravity.

Verify the connection

Check your key and the model before you send a prompt from the extension:

export APERTIS_API_KEY="your_apertis_api_key"

# 1. The key is valid: lists the models it can call
curl -s https://api.apertis.ai/v1/models \
  -H "Authorization: Bearer $APERTIS_API_KEY" | head -c 300

# 2. The model answers
curl -s https://api.apertis.ai/v1/responses \
  -H "Authorization: Bearer $APERTIS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "claude-sonnet-4-6", "input": "Reply with the word ok"}'

The second command returns JSON with "status": "completed" and the reply ok. Next, send a prompt from the extension's chat panel in Antigravity, and the extension shows the model's reply.

Troubleshooting