The API Gateway vs AI Gateway distinction is the key insight here. I've seen teams try to bolt token tracking onto Kong or Nginx and it always ends up as a fragile custom plugin that breaks on streaming responses. The moment you need to count tokens mid-stream or enforce per-team budgets at the request level, generic reverse proxies fall apart. One thing I'd add: semantic caching is where the real cost savings hide. Most teams have 20-30% duplicate or near-duplicate prompts across users, and caching those at the gateway layer cuts spend without any application code changes.
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The API Gateway vs AI Gateway distinction is the key insight here. I've seen teams try to bolt token tracking onto Kong or Nginx and it always ends up as a fragile custom plugin that breaks on streaming responses. The moment you need to count tokens mid-stream or enforce per-team budgets at the request level, generic reverse proxies fall apart. One thing I'd add: semantic caching is where the real cost savings hide. Most teams have 20-30% duplicate or near-duplicate prompts across users, and caching those at the gateway layer cuts spend without any application code changes.