OpenAI now returns distinct error codes for two previously identical 429s — traffic that ramps too fast gets slow_down, model saturation gets a 503. Your retry logic must treat them differently, and most AI gateway clients currently don't.
DashScope rate-limit fallback routing is now an explicit operator pattern: Alibaba documents RPM, TPM, burst protection, backup models, Batch API, and 30-day temporary TPM increases.
Anthropic's June 26 rate limit overhaul gives Sonnet and Haiku the same RPM, ITPM, and OTPM as Opus at every tier — and consolidates five usage tiers into three. Here's what the new Start/Build/Scale structure means for fallback routing policy and spend cap management.
Anthropic doubled Claude Code rate limits and raised Opus API ceilings with 220K GPUs at SpaceX Colossus 1. Learn how this changes fallback triggers, scheduling, and multi-provider routing strategy.
