Error: "UNAVAILABLE (code 503): No capacity available for model gemini-3.1-pro-high on the server"

Gemini API
,
1

I see the error in the console “Outputs”:

`2026-03-05 14:24:32.204 [info] I0305 14:24:32.201517 36576 planner_generator.go:323] Encountered retryable api error. retrying in 5s. Error (The model is currently unreachable.): UNAVAILABLE (code 503): No capacity available for model gemini-3.1-pro-high on the server: UNAVAILABLE (code 503): No capacity available for model gemini-3.1-pro-high on the server

2026-03-05 14:24:37.214 [info] E0305 14:24:37.214106 36576 log.go:380] UNAVAILABLE (code 503): No capacity available for model gemini-3.1-pro-high on the server: UNAVAILABLE (code 503): No capacity available for model gemini-3.1-pro-high on the server

2026-03-05 14:24:37.247 [info] I0305 14:24:37.247387 36576 planner_generator.go:288] Requesting planner with 143 chat messages at model retry attempt 1 and API retry attempt 2

2026-03-05 14:24:43.010 [info] I0305 14:24:43.010434 36576 http_helpers.go:123] URL: https://daily-cloudcode-pa.googleapis.com/v1internal:streamGenerateContent?alt=sse Trace: 0xfa789ece376f8784

2026-03-05 14:25:05.024 [info] I0305 14:25:05.024303 36576 planner_generator.go:288] Requesting planner with 147 chat messages at model retry attempt 1 and API retry attempt 1

2026-03-05 14:25:10.288 [info] I0305 14:25:10.286905 36576 http_helpers.go:123] URL: https://daily-cloudcode-pa.googleapis.com/v1internal:streamGenerateContent?alt=sse Trace: 0x87398e85b8dafd77

2026-03-05 14:25:12.975 [info] (Antigravity) 2026-03-05 14:25:12.975 [INFO]: [Terminal] Command completed: dotnet test exit code 1

2026-03-05 14:25:13.020 [info] I0305 14:25:13.020289 36576 planner_generator.go:288] Requesting planner with 149 chat messages at model retry attempt 1 and API retry attempt 1

2026-03-05 14:25:20.547 [info] I0305 14:25:20.547054 36576 http_helpers.go:123] URL: https://daily-cloudcode-pa.googleapis.com/v1internal:streamGenerateContent?alt=sse Trace: 0x3d39a5a1eee930a6

2026-03-05 14:25:22.002 [info] E0305 14:25:22.002203 36576 interceptor.go:74] /exa.language_server_pb.LanguageServerService/SendActionToChatPanel (unknown): can’t send message because channel is full`

It’s not clear, what should I do as a user in this case? Why IDE doesn’t show to a user any warnings and recommendations?

2

In our project, where we validate documents using the Gemini API, we also had problems today: 2026-02-05 10:10:54 UTC-5

We use gemini-3-flash-preview model

[2026-02-25 15:29:19] production.WARNING: Gemini API Error: {
  "error": {
    "code": 503,
    "message": "This model is currently experiencing high demand. Spikes in demand are usually temporary. Please try again later.",
    "status": "UNAVAILABLE"
  }
}
3

“message”: “No capacity available for model gemini-3.1-pro-high on the server”,

"status": "UNAVAILABLE"
4

facing the same issue “
Trajectory ID: d0e17b70-8f61-4769-9484-69dbce7
Error: HTTP 503 Service Unavailable
Sherlog:
TraceID: 0x9f539a1099f7
Headers: {“Alt-Svc”:[“h3=“:443”; ma=2592000,h3-29=“:443”; ma=2592000”],“Content-Length”:[“419”],“Content-Type”:[“text/event-stream”],“Date”:[“Wed, 08 Apr 2026 14:56:10 GMT”],“Server”:[“ESF”],“Server-Timing”:[“gfet4t7; dur=1389”],“Vary”:[“Origin”,“X-Origin”,“Referer”],“X-Cloudaicompanion-Trace-Id”:[“9f539a1099f76da2”],“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”
}
}

5

{“error”:{“code”:503,“message”:“This model is currently experiencing high demand. Spikes in demand are usually temporary. Please try again later.”,“status”:“UNAVAILABLE”}}

it’s been 10 days