HTTP 503 Service Unavailable

Google Antigravity
1

Trajectory ID: 43cf0b25-0ff3-4a35-bf7c-b8ca33…
Error: HTTP 503 Service Unavailable
Sherlog:
TraceID: 0xcc3992e0bc1c…
Headers: {“Alt-Svc”:[“h3=“:443”; ma=2592000,h3-29=“:443”; ma=2592000”],“Content-Length”:[“421”],“Content-Type”:[“text/event-stream”],“Date”:[“Wed, 18 Mar 2026 08:29:42 GMT”],“Server”:[“ESF”],“Server-Timing”:[“gfet4t7; dur=482”],“Vary”:[“Origin”,“X-Origin”,“Referer”],“X-Cloudaicompanion-Trace-Id”:[“cc3992e0bc1cf886”],“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”
}
}

image
image457×344 13 KB

image
image912×829 38.8 KB

2

I see the same issue at the moment:
Trajectory ID: 993aed44-be3c-40a6-
Error: HTTP 503 Service Unavailable
Sherlog:
TraceID: 0x97a13bb25a
Headers: {“Alt-Svc”:[“h3=“:443”; ma=2592000,h3-29=“:443”; ma=2592000”],“Content-Length”:[“526”],“Content-Type”:[“text/event-stream”],“Date”:[“Wed, 18 Mar 2026 08:52:55 GMT”],“Server”:[“ESF”],“Server-Timing”:[“gfet4t7; dur=224”],“Vary”:[“Origin”,“X-Origin”,“Referer”],“X-Cloudaicompanion-Trace-Id”:[“97a13bb25a92dceb”],“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”
},
{
“@type”: “type.googleapis.com/google.rpc.RetryInfo”,
“retryDelay”: “4s”
}
],
“message”: “No capacity available for model gemini-3-flash-agent on the server”,
“status”: “UNAVAILABLE”
}
}

3

I have the exact same problem. Even after a month, customer service couldn’t solve it. Actually, most AI Ultra users are experiencing this. The only workaround I found that definitely works is unsubscribing from AI Ultra and Pro. I hope this helps.

4

Antigravity is getting completely unusable. I regret my pro plan and want my money back!

5

Now google antigravity is not useable. its fully waste of money. their model not work always give me this error. They don’t have capacity but they sale huge quantity. now their entire system is broken.

6

I usually liked Google Services. But something is obviously out of control! I can’t work in Antigravity for 2 weeks now, and counting… No public anouncement of what is happening, no ask for help, total silence, so far!