Unverified50% confidenceFactExact time
A larger context window increases memory requirements (including the KV cache), and a 256K label only indicates the supported context window, not that the current machine can quickly utilize it to its full extent.
1
Sources
50%
Confidence
Long-term
Relevance
9/29/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedThe larger the context window, the more cache is needed, the greater the memory footprint, and the slower the speed; taking Qwen 3.8 as an example, the cache for a 256K context window can reach 17 GB, making it twice as slow as a smaller window.77% similarUnverified一个200K上下文窗口的请求，其KV Cache可能占据数十GB显存74% similarUnverifiedIn a well-designed memory system, the information injected into the context typically occupies only 30%–50% of the total context window capacity.73% similar
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