Skip to main content
Watch: I Built an AI App Without Leaving Databricks

Anthropic Claude API error

Anthropic API 413 request_too_large: what it means and how to fix it

Error message
413 request_too_large

Retry? Not statedLast verified 1 documented fix1 source

What it means

The request exceeds the maximum allowed number of bytes. On the direct Claude API, Cloudflare returns this error before the request reaches the API servers.

Causes

  • Messages API request over 32 MB
  • Token Counting API request over 32 MB
  • Batch API request over 256 MB
  • Files API request over 500 MB

How to fix it

  1. Fix 1.

    Keep the request under the per-endpoint maximum listed in Request size limits (Messages API 32 MB, Token Counting API 32 MB, Batch API 256 MB, Files API 500 MB).

More Anthropic API errors

All 13 Anthropic API errors

HTTP 413 at other providers

Compare 413 across providers

FAQ

What does the Anthropic API error "413 request_too_large" mean?

The request exceeds the maximum allowed number of bytes. On the direct Claude API, Cloudflare returns this error before the request reaches the API servers.

How do I fix Anthropic API "413 request_too_large"?

Keep the request under the per-endpoint maximum listed in Request size limits (Messages API 32 MB, Token Counting API 32 MB, Batch API 256 MB, Files API 500 MB).

Should I retry Anthropic API "413 request_too_large"?

Not stated. The official docs do not say whether this error is retryable.

Which other AI APIs return HTTP 413?

Per their official error docs: Groq API (413 Request Entity Too Large), OpenRouter (413 payload_too_large).

Sources

Last verified against 1 source: Anthropic API's official docs and official SDK repositories.

Newsletter

Know when the APIs change

One email per week. New model releases, API changes, what broke, and how developers are working around it.