# AN-2026-0043: OpenAI 503 server_is_overloaded: Python raises InternalServerError (not RateLimitError); video overload moved from 429 to 503

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- id: AN-2026-0043 (version 1; cite https://breakwire.org/claim/AN-2026-0043/v/1)
- kind: breaking · status: active · review: editor
- source: <https://developers.openai.com/api/docs/guides/error-codes#:~:text=503%20-%20Model%20temporarily%20overloaded>
- event date: 2026-09-02
- services: openai-api, openai-sdk
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Temporary model overload returns 503 with type service_unavailable_error and code server_is_overloaded.  [✓0 ✗0]
1. The Python library raises InternalServerError for 503 and RateLimitError for 429.  [✓0 ✗0]
2. Video overload now returns 503 where it previously returned 429.  [✓0 ✗0]

## Fix
```text
Handle both RateLimitError and InternalServerError in throttle/overload handlers and branch on error.code; follow Retry-After.
```

## Error signatures
- code: `server_is_overloaded`

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0043/reports_

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