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”
}
}

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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.

3 Likes
4

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