OpenRouter Reliability & Automatic Failover: How Requests Keep Succeeding

Calling one provider directly means a single point of failure. When it goes down, your users get errors, and you find out from a support ticket an hour later. That’s the problem OpenRouter solves: it routes every request to keep it succeeding, across providers automatically and across models when configured. With OpenRouter, you build reliability into your app with 2 separate configurations. Provider failover is automatic and on by default. Model fallbacks are opt-in. The 2 layers cover different failures; if every provider for a primary model fails simultaneously, provider failover has nowhere to go. Model fallbacks are the second line of defense. Here’s a config worth starting from on every project. Copy it and adjust: LLM requests fail for predictable reasons: provider outages, rate limits (429), context-length errors, and content-moderation refusals. Reliability comes in 2 layers: provider-layer failover (on by default, recovers within one model) and model-layer fallbacks (opt-in via a models array, recovers across models). A routing layer detects provider health in real time and steers around outages, so worst-case uptime beats any single provider you’d integrate directly. Failover walks your models list in order. Once the list is exhausted, the last error comes back, so order it…