In 2005, every enterprise had a sprawl of APIs and no consistent way to govern them. By 2015, the API gateway category was a $5B+ market — Apigee, Mulesoft, Kong, AWS API Gateway. The reason it consolidated is simple: nobody wanted to reinvent identity, rate-limiting, observability and policy enforcement for every API.
We are exactly where API governance was twenty years ago, but for AI. Models are sprawling. Agents are sprawling. Every team is reinventing prompt-injection defenses, audit trails, model failover and FinOps. The pattern is the same. The gateway is forming.
Two flows, one control plane
What's distinct about the AI Gateway category is that it routes two flows the API gateway never had to think about:
- 1.Model traffic — calls to OpenAI, Anthropic, Gemini, open-source LLMs, your fine-tunes — across multiple providers and silicon classes, with cost/latency/quality/compliance routing.
- 2.Agent traffic — every agent in the enterprise, whether you built it, bought it from a vendor, downloaded it from an OSS repo or it's embedded in a SaaS app — under one identity, policy and audit layer.
Both flows need the same primitives: authentication, authorization, observability, throttling, redaction, audit. Both can be governed from one console. Splitting them across separate tools recreates exactly the integration burden the gateway was supposed to remove.
Why now
- Model sprawl is unavoidable. Enterprises now run 10+ models across 3+ providers; the model lock-in conversation is over.
- Agent sprawl is accelerating. Every SaaS vendor is shipping agents. Procurement can't keep up.
- Risk is concentrating. Prompt injection, data exfiltration and rogue agent behavior are now board-level concerns.
- FinOps is impossible without it. Without per-call attribution, AI spend is a black box.
"We tried to roll our own. After six months we had a half-finished gateway and a team that wanted to quit. Buying solved it in a week."
The build-vs-buy moment
Every CIO will face the AI Gateway decision in the next twelve months. The teams that try to build it themselves will end up in the same place the API-gateway-builders ended up in 2010: with brittle internal tooling, no path to compliance, and an angry developer experience. The teams that buy will be operating on the next layer of the stack while the rest are still wiring auth.