Today we’re introducing Zyphra Hierarchical Attention (ZHA), a path to true subquadratic attention. ZHA searches a learned tree of compressed summaries, with projected speedups of 35× over dense attention and 5× over MSA at 10M tokens, increasing to ~400× and ~55× at 1B. 🧵 https://t.co/531AyZCwwB
Nov 2, 2026
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