AI Ultra Plan - Repeated HTTP 503 MODEL_CAPACITY_EXHAUSTED for claude-opus-4-6-thinking (Over a Month)

Google Antigravity
1

I am a paying AI Ultra subscriber and the service has been unusable for over a month due to repeated HTTP 503 errors.

When Antigravity does work, it is inconsistent and does not reliably follow the prompt. In practice, it completes only 1–2 tasks before failing again, making the paid Ultra tier unsuitable for real work.

Exact error details:

  • Error: HTTP 503 Service Unavailable
  • 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
  • Trajectory ID: `b0a9cd4d-96d2-4885-
  • TraceID: `0x482a6217

This is a server-side reliability failure on a paid plan. A premium subscription should provide stable and consistent model access. I am requesting either immediate remediation with a confirmed timeline, or a billing adjustment / refund for the period during which the service has not been reliably usable.

2

Hi @Tim-Ahi

Thank you for bringing this to our attention. We sincerely apologize for the inconvenience this has caused. We have escalated the issue to our internal teams for a thorough investigation.

3

Same issue here, bumping this up +1

4

I have the same issue +1

5

So how long? I have been having this issues since 3 months. actually 1 week after antigravity launched.

6

Hello @Tim-Ahi @trinm1112 @A.M,

We’re finding new ways to share more capacity with the Antigravity community. During windows where we have unused capacity, currently in the late afternoon PST, you’ll notice that your baseline quota stretches further. You’ll get more requests and less downtime within your existing plan.

As global demand shifts, we’ll continue to adjust these windows to pass any available capacity back to you. We’re committed to expanding access and ensuring every developer has the capacity they need to keep building.

7

Experiencing the same issue despite quote showing complete availability of the model

8

Theoretically, this is an issue with Google’s load balancer, which identifies your requests as non-Ultra.

It’s just another bug that Google doesn’t want to fix :slight_smile:

I contacted support, but they only advised me to:

  1. Log out.

  2. Unlink Antigravity in the settings of all Google accounts.

  3. Uninstall and reinstall Antigravity.

But none of that helps