---
id: status-codes-october-2026
slug: status-code-distribution-october-2026
title: "Provider error code distribution, October 2026"
topic: reliability
period: Oct 2026
updated: 2026-11-11
license: CC BY 4.0
canonical: https://www.requesty.ai/data/status-code-distribution-october-2026
---

# Provider error code distribution, October 2026

> What errors do AI providers return? In October 2026, 429 rate limits made up 66.4% of provider-returned errors on the Requesty gateway. 400 Bad Request was next at 18.5%, and 503 Service Unavailable at 6.3%.

*Topic: Reliability and ops. Period: Oct 2026. Last updated 2026-11-11.*

## Why it matters

Most provider failures are capacity limits, not outages. That is why fallbacks across providers recover most failed requests.

## Questions this answers

- What is the most common LLM API error?
- How often do providers return 429 rate limits?
- How common are 5xx errors from AI providers?

## Key findings

1. 429 Too Many Requests: 66.4%.
2. 400 Bad Request: 18.5%.
3. 503 Service Unavailable: 6.3%.
4. 404 Not Found: 4.0%.
5. 402 Payment Required: 1.5%.

## Data

| Status code | Description | Bucket | % of rejections (percent) |
| --- | --- | --- | --- |
| 429 | Too Many Requests | auth_quota | 66.36% |
| 400 | Bad Request | client_error | 18.50% |
| 503 | Service Unavailable | server_error | 6.28% |
| 404 | Not Found | not_found | 3.96% |
| 402 | Payment Required | auth_quota | 1.45% |
| 500 | Internal Server | server_error | 1.01% |
| 504 | Gateway Timeout | gateway | 0.74% |
| 401 | Unauthorized | auth_quota | 0.59% |
| 502 | Bad Gateway | gateway | 0.42% |
| 410 | Gone | not_found | 0.30% |
| 422 | Unprocessable | client_error | 0.24% |
| 403 | Forbidden | auth_quota | 0.05% |
| 408 | Request Timeout | gateway | 0.04% |
| 529 | Site Overloaded | server_error | 0.03% |

## Caveats

- Errors returned by upstream providers only; router and gateway rejections are excluded.

## Cite as

**APA.** Requesty (2026). Provider error code distribution, October 2026. Requesty Data. https://www.requesty.ai/data/status-code-distribution-october-2026

```bibtex
@misc{requesty_status_code_distribution_october_2026,
  author       = {{Requesty}},
  title        = {Provider error code distribution, October 2026},
  year         = {2026},
  howpublished = {\url{https://www.requesty.ai/data/status-code-distribution-october-2026}},
  note         = {Requesty Data}
}
```

---

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