What HTTP 529 means
Anthropic Claude API uses 529 for overload errors (overloaded_error). Always retry with exponential backoff and jitter. Not an RFC code; community-defined.
Typical causes
- Anthropic Claude API overloaded
- Service capacity exhausted
529 5xx Non-standard Site Is Overloaded
Anthropic API and others use this for service overload.
529 across services
How 1 different errors map to HTTP 529 across the services we cover.