What Is a Context Window? Explaining LLM Memory Capacity

The article explains that a context window defines an LLM's token‑level memory capacity, shows how longer windows cause quadratic computation growth, introduces KV Cache as a way to extend context without exploding resources, and covers advanced techniques like Ring Attention, NIAH benchmarking, and attention decay in long sequences.

KV CacheLLMNIAH benchmark

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What Is a Context Window? Explaining LLM Memory Capacity