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DRAGOON: Benchmarking Large Language Models for Retrieval-Augmented Generation at Scale End-to-End Instrumentation of RAG: Phase-Level Timing, Per-Stage Latency, Time-to-First-Token (TTFT), Token Usage, Cost Accounting, and Throughput at Scale with Sta

Reema Bhaskar, USDOE, Silba Dowell, Andres Quan

2026

Abstract

What We Set Out to AnswerFive questions the Dragoon instrumentation is built to answer 1 Latency Composition How is end-to-end latency distributed across the embedding, retrieval, and generation stages of the pipeline? 2 Responsiveness How does time-to-firsttoken, measured through streaming, compare across models under identical conditions? 3 Token & Cost Efficiency How many prompt, completion, reasoning, and cached tokens does each model consume, and what does that cost at real pricing?4 Concurrent Scalability How does throughput scale with parallel workers, and at what worker count does each model saturate?

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