guideai api rate limits429 too many requestsrpm tpm limitsapi throughputrate limit handlingAI API Rate Limits Explained: RPM, TPM, 429s & How to Handle ThemA developer's guide to AI API rate limits — RPM vs TPM, why you hit 429 errors, exponential backoff, and how gateways with pooled capacity smooth throughput.2026-07-10claire-lowe