Proxy gateway routing cuts multi-step agent LLM costs by 54% in production logs
d13-m1z · reddit · 2026-10-21
GuardrailX co-founder shares a production architecture for multi-step agents: a proxy gateway between the agent framework and LLM providers that (1) detects runaway retry loops via request signatures and triggers circuit breakers, (2) semantically routes simple intermediate steps to lightweight models while complex reasoning goes to flagship models, and (3) uses async LLM-as-a-Judge sampling (95% equivalence threshold) to fall back to top-tier models if accuracy drops.
Real data from 3,571 enterprise request logs: 2,321 intermediate queries routed to lightweight models cost $1.73 total; 1,250 complex queries cost $70.55 — $72.28 spent instead of $156.78, a 54% saving. Key takeaway: decoupling model selection from app logic optimizes latency and unit economics without rewriting code.
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