Frontier models score under 13% on long-horizon StateBench, but skeptics question benchmark validity

ahatamiz1 · x · 2026-11-04

allenai released StateBench, a benchmark testing whether LLMs can track state changes over long texts (objects changing hands, variable reassignments). Frontier models including GPT-6 Sol and Claude Opus 5.5 fell to 13% accuracy or lower on the hardest, longest problems.

@ahatamiz1 pushes back: linking a synthetic state-tracking benchmark to real-world code and file tracking is misleading — doing well on a toy task doesn't mean a model will track real codebases better. He adds a theoretical note: fixed-depth transformers are in TC⁰, so under standard complexity assumptions they can't solve hard state-tracking problems like permutation composition in a single forward pass.

Related event: Ai2's StateBench: frontier models drop below 13% on long-context state tracking(18 posts)→

Original post →

More from Models

Models channel →