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Anthropic HTTP 529 Server error

Anthropic 529 — Overloaded

What this error means

A 529 overloaded_error is server-side back-pressure from Anthropic during demand spikes. It is transient.

How to fix it

  • Retry with exponential backoff and jitter
  • Fail over to another provider on repeated 529s
  • Cap concurrency during known peak windows
Example error message
{
  "type": "error",
  "error": {
    "type": "overloaded_error",
    "message": "Overloaded"
  }
}

Frequently asked

Why 529 and not 503?

Anthropic uses 529 specifically for capacity overload; treat it like a retryable 503.

More Anthropic errors

CodeErrorAffected teams / 30 days
400 Anthropic 400 — You are out of extra usage 30 View
View all Anthropic errors
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All errors

ProviderCodeErrorTypeAffected teams / 30 days
Google Gemini 429 Gemini 429 — You exceeded your current quota Rate limit 120 View
OpenRouter 404 OpenRouter 404 — No endpoints found for model Model unavailable 80 View
OpenRouter 402 OpenRouter 402 — Insufficient credits Billing / quota 70 View
OpenAI 429 OpenAI 429 — Rate limit exceeded Rate limit 68 View
OpenAI 401 OpenAI 401 — Invalid authentication Authentication 55 View
DeepSeek 400 DeepSeek 400 — reasoning_content must be passed Bad request 48 View
Google Gemini 400 Gemini 400 — Function call missing a thought_signature Bad request 42 View
Google Gemini 503 Gemini 503 — The model is currently overloaded Server error 40 View
Groq 429 Groq 429 — Rate limit exceeded Rate limit 38 View
OpenAI 400 OpenAI 400 — Context length exceeded Bad request 34 View
Anthropic 400 Anthropic 400 — You are out of extra usage Bad request 30 View
Anthropic 529 Anthropic 529 — Overloaded Server error 26 View
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