[Bug] Antigravity Agent Terminated: HTTP 503 / MODEL_CAPACITY_EXHAUSTED (gemini-3.1-pro-high) on Ultra Tier

Google Antigravity
1

Hi everyone,

I’m currently experiencing consistent crashes with the Antigravity agent and wanted to see if others are facing the same issue or if there’s an ETA for a fix.

I was in the middle of having the agent help me code some server-side logic and port configurations for a Project Zomboid multiplayer server when the agent suddenly terminated. Clicking “Retry” doesn’t seem to bypass the issue for long.

Here is the exact debug log:

Trajectory ID: 707f15f3-1042-4fc6-b24d
Error: HTTP 503 Service Unavailable
Sherlog:
TraceID: 0xe44bb38ed

{
“error”: {
“code”: 503,
“details”: [
{
“@type”: “type.googleapis.com/google.rpc.ErrorInfo”,
“domain”: “cloudcode-pa.googleapis.com”,
“metadata”: {
“model”: “gemini-3.1-pro-high”
},
“reason”: “MODEL_CAPACITY_EXHAUSTED”
}
],
“message”: “No capacity available for model gemini-3.1-pro-high on the server”,
“status”: “UNAVAILABLE”
}
}

I am currently subscribed to the Ultra tier. I understand that server-wide traffic spikes happen, but I wanted to ask the community/team: is there currently a massive global outage for gemini-3.1-pro-high? And how does priority routing work for Ultra subscribers during these capacity-exhausted events?

Any insights or updates from the Google team would be greatly appreciated. Thanks!

2

I am experiencing the same problem. It’s been about 5 hours, and I am using the same AI Ultra plan.

Neither Claude nor Gemini 3.1 are working.

3

I’m experiencing the exact same thing. I spent half the day trying to fix it, thinking it was a problem on my end, before realizing it’s just Google’s servers acting up. I’ve already given up and will just try again later.

4

да - у меня тоже самое длится уже 12 часов

5

I’m experiencing the same thing with Antigravity, and it’s been 12 hours or so, is it just me?

6

Same for me. I asked Gemini, and he said it’s a global issue.

7

Hi, the other models are also useless, Claude Opus, Gemini Pro, all models and I’m currently with the AI ultra service

Error: HTTP 503 Service Unavailable
“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”
}
}

8

Subject: Antigravity IDE 503 MODEL_CAPACITY_EXHAUSTED Ultra Tier
Trajectory ID: 3bd200b5-96e3-426c-93f
TraceID: 0x34cc9a (10:16 MSK)
CloudCode/Antigravity/Code Assist не работает с 11:00 MSK
Ultra tier 25k credits unused, Europe region
Gemini 3.1 Pro Low + Claude Sonnet 4.6 BOTH DOWN
Consumer sites (claude.ai) work fine
Demand: Priority capacity OR full refund

9

That sounds really frustrating, especially with unused credits and both models down. Hope they fix it or resolve your request quickly.

10

Hello all,

I just started experiencing this issue as well and it’s been a few days since I last fired up Antigravity but after asking Gemini via gemini.google.com - it sounds like this appears to be more of a traffic jam on the server side.

Trajectory ID: cdbb905e-1c8d-4fc4-826c-c9ea52ba3
Error: HTTP 503 Service Unavailable
Sherlog: 
TraceID: 0x1649382430dd4
Headers: {"Alt-Svc":["h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000"],"Content-Length":["419"],"Content-Type":["text/event-stream"],"Date":["Tue, 14 Apr 2026 20:47:31 GMT"],"Server":["ESF"],"Server-Timing":["gfet4t7; dur=252"],"Vary":["Origin","X-Origin","Referer"],"X-Cloudaicompanion-Trace-Id":["1649382430dd43ae"],"X-Content-Type-Options":["nosniff"],"X-Frame-Options":["SAMEORIGIN"],"X-Xss-Protection":["0"]}

{
  "error": {
    "code": 503,
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "domain": "cloudcode-pa.googleapis.com",
        "metadata": {
          "model": "gemini-3.1-pro-high"
        },
        "reason": "MODEL_CAPACITY_EXHAUSTED"
      }
    ],
    "message": "No capacity available for model gemini-3.1-pro-high on the server",
    "status": "UNAVAILABLE"
  }
}

Any insights into this would be greatly appreciated.

Thank you

11
12

I switched models to Gemini 3 Flash and it started to for a brief few moments to work but then immediately crash with the same error message.

Trajectory ID: cdbb905e-1c8d-4fc4-826c-c9ea52ba36fa
Error: HTTP 503 Service Unavailable
Sherlog: 
TraceID: 0x8932adc03366543e
Headers: {"Alt-Svc":["h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000"],"Content-Length":["421"],"Content-Type":["text/event-stream"],"Date":["Tue, 14 Apr 2026 21:56:04 GMT"],"Server":["ESF"],"Server-Timing":["gfet4t7; dur=436"],"Vary":["Origin","X-Origin","Referer"],"X-Cloudaicompanion-Trace-Id":["8932adc03366543e"],"X-Content-Type-Options":["nosniff"],"X-Frame-Options":["SAMEORIGIN"],"X-Xss-Protection":["0"]}

{
  "error": {
    "code": 503,
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "domain": "cloudcode-pa.googleapis.com",
        "metadata": {
          "model": "gemini-3-flash-agent"
        },
        "reason": "MODEL_CAPACITY_EXHAUSTED"
      }
    ],
    "message": "No capacity available for model gemini-3-flash-agent on the server",
    "status": "UNAVAILABLE"
  }
}
13

FWIW, it seems that this has been a prominent and recurring issue in the past couple of days. Here’s a link to another thread with some troubleshooting steps.

14

Yes, google Antigravity is completely unusable! Very frustrating!

15

i have the exact same issue since this morning ( 3h downtime )

Trajectory ID: 074a4ebf-9b1d-42e0-84c0-a51cf13b67
Error: HTTP 503 Service Unavailable
Sherlog:
TraceID: 0x5730a2df4953f7
…
…

{
“error”: {
“code”: 503,
“details”: [
{
“@type”: “type.googleapis.com/google.rpc.ErrorInfo”,
“domain”: “cloudcode-pa.googleapis.com”,
“metadata”: {
“model”: “gemini-3-flash-agent”
},
“reason”: “MODEL_CAPACITY_EXHAUSTED”
}
],
“message”: “No capacity available for model gemini-3-flash-agent on the server”,
“status”: “UNAVAILABLE”
}
}

16

None of the Gemini models worked on Antigravity today, causing significant delays and issues in the development workflow.

17

Same issue from morning.

By the way how/why web version of gemini still working.

They taken money and it not working properly

18

I have had the exact same issue for over two weeks. im yet to try Antigravity yet as it wont work, i have tried mutliple machines, fresh installs etc, i can confirm this issue effects ubuntu installs.

19

Is it still not working? Do you know anyway to fix this from past 3 days its constantly not working any models for me

20

it s not working yet
For gemini model I have this error
For claude its high traffic error
nice