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How to Read AI API Error Codes: Causes, Retries, and Fallbacks for 400, 401, 404, 429, 5xx, and 529
Explains common LLM API error codes by splitting them into "fix the request" and "wait and retry" categories, focusing on distinguishing 429 rate limits from quota exhaustion, and provides backoff retry, circuit breaker, and fallback patterns to avoid wasted retries and retry storms.
AI API Troubleshooting: From 401, 404, 429 to Timeouts, Truncation, and Suspected Model Downgrades, Locate in Order
When calling a large model API, first look at the status code and the error type in the response body, then use a minimal request to determine whether the problem is on the client or server side. This article explains how to diagnose and handle each type of issue in order: authentication, path and model ID, rate limiting and quotas, 5xx and timeouts, context truncation, and downgrade verification.
