ULTRA USERS - PLEASE HELP - All Claude models return 503 MODEL_CAPACITY_EXHAUSTED for multiple days

Google Antigravity
1

Hi team,

I’m an Ultra subscriber and have been unable to use any Claude model in Antigravity for several consecutive days. All Claude requests fail with HTTP 503 MODEL_CAPACITY_EXHAUSTED, while Gemini models on the same account work without issue. This strongly suggests a problem specific to the Claude backend integration, not account-level or client-level.

Environment

  • Antigravity: latest version, tested on both Windows (native) and macOS
  • Account: Ultra subscription, 100% quota remaining
  • Network: no VPN, direct connection
  • Already tried: full reinstall, cache clear, re-login, new conversation

Model availability on my account (tested today)

Model Status
Gemini 3 Flash :white_check_mark: Works
Gemini 3.1 Pro :white_check_mark: Works
Claude Sonnet 4.6 :cross_mark: 503 MODEL_CAPACITY_EXHAUSTED
Claude Opus 4.6 Thinking :cross_mark: 503 MODEL_CAPACITY_EXHAUSTED

Sample error (Claude Opus 4.6 Thinking)

Trajectory ID: 95388a7f-7ca7-47e9-bf17-b6310707706f
TraceID: 0xdd4e609d6e97a19e
Date: Fri, 24 Apr 2026 01:03:14 GMT

{
  "error": {
    "code": 503,
    "details": [{
      "@type": "type.googleapis.com/google.rpc.ErrorInfo",
      "domain": "cloudcode-pa.googleapis.com",
      "metadata": { "model": "claude-opus-4-6-thinking" },
      "reason": "MODEL_CAPACITY_EXHAUSTED"
    }],
    "message": "No capacity available for model claude-opus-4-6-thinking on the server",
    "status": "UNAVAILABLE"
  }
}

Same MODEL_CAPACITY_EXHAUSTED reason for Claude Sonnet 4.6 as well.

What this is not

  • Not a client/cache issue (reinstall didn’t help; Gemini works on same install)
  • Not an account/quota issue (100% quota, Gemini works)
  • Not a network issue (same network, Gemini works)
  • Not a WSL/Remote issue (reproduced on native Windows and macOS)

This appears to be a sustained capacity shortage — or a broken integration — affecting all Claude models on the cloudcode-pa backend.

What I’m asking for

  1. Official acknowledgment on the status page
  2. ETA for Claude model availability to be restored
  3. Pro-rated credit or compensation for Ultra subscribers during this outage — Claude models are a core advertised feature of the subscription
  4. Clear communication when such incidents occur in the future

Happy to provide additional Trajectory IDs if helpful. Other Ultra subscribers seeing the same pattern — please reply with your Trajectory IDs to strengthen the signal.

Thanks.