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Long documents still lose the plot

Ai2's StateBench checks whether a model can track changing facts across a long document, at four levels of difficulty. Frontier models handle the easy levels and break down on the hardest long ones. It is a benchmark. It will not file your contracts.

Verdict
Watch Promising, but something is missing: access, pricing, or proof.
For
people judging long-document models
Why it matters
Frontier models handle the easy levels and break down on the hardest long ones. It will not file your contracts.
Next check
Recheck if a product you use cites a StateBench result for the documents you care about.
Published
Filed
By
The Loaded Tokens desk
Topic
Search & research
Sources
Allen Institute for AI

Sources & limits: This is our recap, not a copy of the original. The links above are the pages we read. We didn't test it ourselves. How we verify

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