Claude 529 overloaded errors: causes and fixes on OpenRouter
Overview
A 529 overloaded_error means Anthropic's API lacks capacity for a Claude model across all users, not that the caller's usage is at fault, according to the OpenRouter Blog.
The blog recommends retrying with exponential backoff first, then sending the same model to another provider. It says Claude Sonnet, Opus and Haiku 5.5 are each served by five providers on OpenRouter.
According to the same post, OpenRouter's default routing fails over to other providers automatically when one returns the error.
Written by AI from the articles below · updated Oct 28, 11:59 AM ET
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The articles in this story. Times are ET.
- OpenRouter BlogOfficialClaude 529 overloaded errors: what they mean and how to fix them
AIA 529 overloaded_error means Anthropic's API lacks capacity for a Claude model across all users, not that the caller's usage is at fault. The OpenRouter Blog recommends retrying with exponential backoff first, then sending the same model to another provider, since Claude Sonnet, Opus and Haiku 5.5 are each served by five providers on OpenRouter. Default routing fails over to other providers automatically.
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