#position bias

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A document-ingestion scanner in a bright test lab with one printed page caught mid-feed through its roller, curling as it is pulled from a tall stack beside it

What Actually Happens Inside a Very Long Claude Context Window

Claude's context window now reaches a million tokens, but independent benchmarks that vary length, position, and lexical overlap show recall degrading well before the window fills — evidence the model's own maker now calls context rot.

By Brecht Corbeel · August 11, 2026 · 17 min read

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