Platform

Anthropic fixes

Claude API 429s, overloaded responses, and keys that must stay on the server.

6 fixes, most common first.

  1. Rank 46. Anthropic or Gemini API 429 and overloaded errors

    Claude returns 429 or 529, or Gemini returns 429 RESOURCE_EXHAUSTED? Read the error, back off, and keep the API key on the server.

  2. Rank 60. Anthropic API key (sk-ant-) is in the front-end code

    An Anthropic sk-ant- key shipped in the browser? The Claude docs tell you to keep the key in an environment variable and to proxy browser calls through your server.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

All platforms

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.

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