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Grouped Query Attention (GQA): How Modern LLMs Shrink KV Cache

GQA cuts KV cache 4-8x vs. multi-head attention with minimal quality loss. Architecture, memory math, MHA vs MQA vs GQA trade-offs, and which models (LLaMA 3, Mistral, Gemma) use it.

Published May 13, 2026
16 min read
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