Hybrid Architecture
A model that mixes different building blocks — say attention plus state-space layers — to get the best of each.
Think of it like
Like a hybrid car pairing an electric motor with a gas engine, using whichever suits the moment.
Example
Some recent long-context models interleave Mamba-style layers with a few attention layers to stay fast without losing recall.
How it actually works
Pure attention is powerful but scales badly with sequence length; alternatives like state-space models are cheaper but weaker at precise recall. Hybrids combine them — mostly cheap layers with a sprinkle of attention — to keep quality high while controlling cost on long inputs. It’s an engineering compromise that’s become popular as context windows balloon.
For product teams
A route to long-context models that don’t blow up in cost or latency.
For engineers
A model interleaving heterogeneous layer types (e.g., attention and SSM) to balance cost and capability.
Related
- State Space Model — One common cheap ingredient in hybrids.
- Attention — The pricey-but-precise ingredient.
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