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Author

Shay B. Cohen

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#natural language process... Preprint Oct 2026

Beyond Context Length: Characterising the Difficulty of Long-Context Reasoning

Long-context language models support ever longer context windows, and evaluations typically treat context length as the main indicator of difficulty. However, context length alone cannot explain why models fail on long-context tasks that require reasoning over complex information. Contexts of equal length can pose very...

Shi-Wen Qin, C. Barker, Henry Gouk et al. · 0 citations
#machine learning Preprint Sep 2026

When Can Attention Heads Be Statically Defined?

Some attention heads learn similar patterns across inputs. Reusing these patterns could reduce training cost by avoiding repeated query-key score computation and softmax. Through controlled pretraining comparisons, we identify Selective Attention Freezing (SAF), which selects heads with low attention-pattern variance a...

Weixian Waylon Li, Yin-Tao Tai, Marcio Fonseca et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Magenta: Closing the Loop Between Mathematical Reasoning and Lean Verification

This paper introduces Magenta, a training-free agentic pipeline that, given only a natural-language problem, produces an answer, expresses it as a Lean 4 statement, and constructs a machine-checked proof, which achieves 100% accuracy across all evaluated olympiad benchmarks.

Joshua Ong Jun Leang, Hao-Nan Li, Zheng-Yang Zhao et al. · 0 citations

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