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Gemini 503 — The model is currently overloaded

40teams hit this · 30d
150occurrences · 30d
79%auto-recovered by Manifest
Occurrences across all Manifest teams, last 14 days

What this error means

A 503 UNAVAILABLE is server-side: Gemini is briefly saturated. It is transient but clusters during peak hours.

How to fix it

  • Retry after a short delay with backoff
  • Fail over to a second model on repeated 503s
  • Avoid hammering the same region during a spike
Example error message
{
  "error": {
    "code": 503,
    "message": "The model is currently experiencing high demand. Spikes in demand are usually temporary.",
    "status": "UNAVAILABLE"
  }
}

Frequently asked

Is a 503 my fault?

No. It is a temporary capacity issue on the provider; a retry or fallback usually succeeds within seconds.

Don't let your requests fail again and again

Manifest fixes your bad LLM requests on the fly so they return successful responses before it reaches your agent. No downtime.

  • Deprecated / Not-found models
  • Wrong parameters
  • Malformed requests
  • Exceeded context windows

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