Antigravity

Antigravity reads the proxy endpoint, virtual key, and target model from claudeCode.environmentVariables in your Antigravity settings.json. On macOS that file lives at ~/Library/Application Support/Antigravity/User/settings.json. To switch providers later, change only the ANTHROPIC_MODEL value — everything else stays the same.

Prerequisites

1. Antigravity extension installed in VS Code
2. sotatek-proxy installed and running on 127.0.0.1:3817
3. A Bifrost virtual key (sk-bf-xxx) — contact your admin

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Configure via CLI

sotatek-proxy setup -p agy writes all required env vars directly into Antigravity’s settings.json — no manual file editing needed. It backs up the existing file before writing.

FridayAIX (Claude)

sotatek-proxy setup -p agy -m fridayaix -k sk-bf-your-key

MiniMax

sotatek-proxy setup -p agy -m minimax -k sk-bf-your-key

Flag	Description
-m / --model	Model profile: fridayaix, minimax (default: fridayaix)
-k / --key	Bifrost virtual key; falls back to existing settings or ANTHROPIC_AUTH_TOKEN env var
--workspace	Write to .antigravity/settings.json in the current project instead of user-level
--dry-run	Preview target path without writing

Reload Antigravity after running to apply the changes.

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Step 1 — install Claude Code extension

Open Antigravity, search for the Claude Code extension and click Install.

Step 2 — open settings.json

Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → Preferences: Open User Settings (JSON).

For workspace-only config, open the workspace settings.json instead. On Antigravity that is usually .antigravity/settings.json in the project root.

Step 3 — paste env config

Replace sk-bf-your-virtual-key-here with your actual key. If settings.json already has other keys, merge the claudeCode.environmentVariables entry — don’t create a second root {}.

FridayAIX (Claude)

{
  "claudeCode.environmentVariables": [
    {
      "name": "ANTHROPIC_BASE_URL",
      "value": "http://127.0.0.1:3817/anthropic"
    },
    {
      "name": "ANTHROPIC_AUTH_TOKEN",
      "value": "sk-bf-your-virtual-key-here"
    },
    {
      "name": "ANTHROPIC_MODEL",
      "value": "fridayaix/claude-opus-4-6"
    },
    {
      "name": "ANTHROPIC_DEFAULT_OPUS_MODEL",
      "value": "fridayaix/claude-opus-4-6"
    },
    {
      "name": "ANTHROPIC_DEFAULT_SONNET_MODEL",
      "value": "fridayaix/claude-sonnet-4-6"
    },
    {
      "name": "ANTHROPIC_DEFAULT_HAIKU_MODEL",
      "value": "fridayaix/claude-haiku-4-5-20251001"
    },
    {
      "name": "CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS",
      "value": "1"
    },
    {
      "name": "DISABLE_PROMPT_CACHING",
      "value": "1"
    }
  ]
}

MiniMax

{
  "claudeCode.environmentVariables": [
    {
      "name": "ANTHROPIC_BASE_URL",
      "value": "http://127.0.0.1:3817/anthropic"
    },
    {
      "name": "ANTHROPIC_AUTH_TOKEN",
      "value": "sk-bf-your-virtual-key-here"
    },
    {
      "name": "ANTHROPIC_MODEL",
      "value": "MiniMax/MiniMax-M2.7"
    },
    {
      "name": "ANTHROPIC_DEFAULT_OPUS_MODEL",
      "value": "MiniMax/MiniMax-M2.7"
    },
    {
      "name": "ANTHROPIC_DEFAULT_SONNET_MODEL",
      "value": "MiniMax/MiniMax-M2.5"
    },
    {
      "name": "ANTHROPIC_DEFAULT_HAIKU_MODEL",
      "value": "MiniMax/MiniMax-M2.5-highspeed"
    },
    {
      "name": "CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS",
      "value": "1"
    },
    {
      "name": "DISABLE_PROMPT_CACHING",
      "value": "1"
    }
  ]
}

Step 4 — switch model

To switch providers, update these four env vars together:

Env var	FridayAIX	MiniMax
ANTHROPIC_MODEL	fridayaix/claude-opus-4-6	MiniMax/MiniMax-M2.7
ANTHROPIC_DEFAULT_OPUS_MODEL	fridayaix/claude-opus-4-6	MiniMax/MiniMax-M2.7
ANTHROPIC_DEFAULT_SONNET_MODEL	fridayaix/claude-sonnet-4-6	MiniMax/MiniMax-M2.5
ANTHROPIC_DEFAULT_HAIKU_MODEL	fridayaix/claude-haiku-4-5-20251001	MiniMax/MiniMax-M2.5-highspeed

Step 5 — reload and verify

1. Save settings.json.
2. Developer: Reload Window if Antigravity doesn’t pick up the change.
3. Open Claude Code chat: Hello, which model are you using?
4. Confirm no authentication error.

Quick reference

Setting	Value
Base URL	http://127.0.0.1:3817/anthropic
Token field	ANTHROPIC_AUTH_TOKEN
Model field	ANTHROPIC_MODEL
Token format	sk-bf-xxx

Troubleshooting

Issue	Solution
Authentication error	ANTHROPIC_AUTH_TOKEN is the Bifrost virtual key; ANTHROPIC_BASE_URL is http://127.0.0.1:3817/anthropic
Connection refused on 127.0.0.1:3817	sotatek-proxy is not running — sotatek-proxy status && sotatek-proxy start
Model not found	Verify exact ANTHROPIC_MODEL string with provider prefix and capitalisation
Antigravity ignores new values	Save settings.json and reload the Antigravity window
Broken settings.json	Validate JSON — check commas and brackets