Cover story · AI Architecture
LLM Gateway Architecture Guide: Routing, Failover & Cost Control (2026)
An LLM gateway sits between your applications or coding harnesses and upstream model providers (Claude, Gemini, OpenAI, local vLLM) to centralize virtual API keys, automatic 429/529 failover, per-tenant USD spend limits, caching, and OpenTelemetry GenAI traces. Use LiteLLM or Kong for self-hosted control, Cloudflare AI Gateway for zero-hop edge caching, or Portkey for managed enterprise routing.
2 Nov 2026 · 7 min read





