[Bug] Account-specific 503 MODEL_CAPACITY_EXHAUSTED only on claude-opus-4-6-thinking

Google Antigravity
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1

Hi Google Antigravity Team,

I am encountering an account-specific issue in Google Antigravity.

Only the model claude-opus-4-6-thinking fails on Account B with HTTP 503 MODEL_CAPACITY_EXHAUSTED. Other models work normally on the same account. Under the same network, same device, and same Antigravity client, Account A can use claude-opus-4-6-thinking successfully.

This suggests the issue is not caused by my network, local client, or general Claude access, but may be related to account-specific model routing, backend capacity allocation, or quota state for claude-opus-4-6-thinking.

Error details:

Trajectory ID: 8f632bd1-a26d-4beb-823e-fa05a652…
TraceID: 0xb2b9254a087bc…
Model: claude-opus-4-6-thinking
Error: HTTP 503 Service Unavailable
Reason: MODEL_CAPACITY_EXHAUSTED
Message: No capacity available for model claude-opus-4-6-thinking on the server
Domain: cloudcode-pa.googleapis.com
Date: Mon, 18 May 2026 11:09:17 GMT

What I have tested:

  1. Same network and same device.
  2. Account A can use claude-opus-4-6-thinking normally.
  3. Account B fails only on claude-opus-4-6-thinking.
  4. Other models work normally on Account B.
  5. Restarting / switching projects does not resolve the issue.

Could you please investigate whether Account B is incorrectly routed to an unavailable capacity pool, or whether the backend state for this account needs to be reset?

Thank you.

2

Second that.

At least some basic information from Google’s team would help, there seem to be A LOT of others experiencing this today.

And yes, I’m on an Ultra plan …

3

I am experiencing the exact same issue.

It feels like for the past few months, the Google development team has done nothing but harvest our problems as data, without providing a single shred of feedback.

Their business model forces consumers to spend money while hoarding our frustrations as data to map out their own future. I can only marvel at this ‘fantastic’ business model.

For months, I’ve been coming here several days a week to read the posts, but seeing how the situation never changes, it’s just depressing. I wonder if I’m the fool, or if we’re all being made fools of

4

Same here! I am receiving persistent HTTP 503 Service Unavailable errors in Google Antigravity for claude-opus-4-6-thinking.