4,474 of 5,369 Output Tokens Were Thinking: Reading Claude API Errors

The most confusing Claude API failure is not a 400, a 429, or a 529. It is an HTTP 200 with an empty text block. Nothing was thrown and nothing was logged as an error, yet your JSON parser reports "no JSON found". In our case the cause was thinking tokens eating the whole max_tokens budget: 4,474 of 5,369 output tokens went to thinking, which left... Weiterlesen: 4,474 of 5,369 Output Tokens Were Thinking: Reading Claude API Errors