Overloaded
A 529 “Overloaded” means Anthropic’s API is temporarily over capacity — it’s on their side, not yours. Retry with backoff, and add a fallback model so your app keeps working during spikes.
Agents that hard-pin a single provider stall completely on a 529. Auto-failover keeps them running through provider spikes.
Standard Compute fails over across providers automatically. If one frontier model is overloaded, it reroutes to another behind the same endpoint — you never configure fallbacks or see a 529.
No. 529 means the provider is over capacity. The only client-side fix is to retry and to have a fallback so you’re not dependent on one provider’s spare capacity.