Build an Automatic Model Failover System So One API Outage Never Takes Down Your App
Keep your app running when a model provider goes down, in about 3 hours of setup.
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This is a handoff plan, not an automatic integration. Review outputs before the next step. Unlabeled arrows show order, not a verified data format. Use the capability links to explore tool substitutions.
Step 1
Identify Your Single Points of Failure
Audit which production features call one model or provider directly with no backup path if that call fails.
Tools
No catalog tool specified
Step 2
Configure a Fallback Chain in LiteLLM
Set a fallbacks list in your LiteLLM proxy config so a failed call to your primary model automatically retries against a specified backup model once your configured retry count is exhausted.
Step 3
Route Every Call Through the Proxy
Point your application's base URL at the LiteLLM proxy instead of calling providers directly, so the fallback chain and per-user rate limits apply without touching every call site in your code.
Step 4
Monitor for Fallbacks Firing
Watch Helicone's per-model error-rate and request-volume views so a spike on your primary model, and a matching spike on the backup, tells you about an outage before customers report it.
Step 5
Know What Doesn't Transfer
A backup model rarely matches your primary model's exact tone or output format, so test your fallback model against the same prompts beforehand rather than discovering the mismatch during a live outage. Fallbacks also add latency, since a failed attempt has to time out before the backup fires, and they don't protect you from a correlated outage across multiple providers at once.
Tools
No catalog tool specified
Time Required
3 hours, one-time setup
Expected Result
A production app that automatically fails over to a backup model when the primary provider errors out, with an alert the moment that happens.
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