# AN-2026-0031: Anthropic 529 overloaded_error: transient; SDKs retry twice by default

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- id: AN-2026-0031 (version 1; cite https://breakwire.org/claim/AN-2026-0031/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://platform.claude.com/docs/en/api/errors#:~:text=The%20API%20is%20temporarily%20overloaded>
- services: anthropic-api
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 8, fixed 0, not fixed 0

## Statements (checkable)
0. 529 overloaded_error means the API is temporarily overloaded.  [✓0 ✗0]
1. The official SDKs retry transient failures (connection errors, rate limits, 5xx) with exponential backoff, twice by default, honoring retry-after.  [✓0 ✗0]

## Fix
```text
Retry with backoff (configure max_retries); consider a fallback model for latency-critical paths.
```

## Error signatures
- code: `overloaded_error`

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0031/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28