Platform
Anthropic fixes
Claude API 429s, overloaded responses, and keys that must stay on the server.
6 fixes, most common first.
- Rank 87. Anthropic API 401 authentication_error or 402 billing_error
Claude returns 401 authentication_error or 402 billing_error in production? The x-api-key is bad, or billing in the Claude Console needs a look. Anthropic's errors page does not use the phrase credit balance is too low.
- Rank 118. Claude API 401 authentication_error
The Claude API returns 401 authentication_error? Anthropic says there is an issue with your API key, for example it is malformed, revoked, or expired.
- Rank 130. Claude API 400: This model does not support assistant message prefill
Claude returns 400 invalid_request_error about assistant message prefill? Newer Claude models reject a conversation that ends with an assistant message.
- Rank 131. Claude API 400: thinking.type.enabled is not supported for this model
Claude returns 400 saying thinking.type.enabled is not supported? Newer models removed extended thinking. Use adaptive thinking and output_config.effort.
Keep going on your own.
The guides stay free. A deep leak report is $15. Fix packs are $24, or $49 for all three. There is no done-for-you repair.