Unverified50% confidenceFactExact time
标准注意力机制的计算复杂度为O(n²)，序列长度翻倍时计算量增加四倍，这是早期GPT-3仅支持4K Token的根本原因
1
Sources
50%
Confidence
Long-term
Relevance
7/13/2026
First Seen
Sources
Claude Code、Codex、Cursor怎么选？三款AI编程工具深度对比
bilibili清华姜学长7/10/2026
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