
Researchers replicated reasoning evaluations from prior work on Opus 4.5, then tested three newer models—Claude Fable 5, Opus 5, and GPT-5.6-Sol—using single-forward-pass evaluation methods. Fable 5 achieved 87.6% accuracy on Gen-Arithmetic with 10 problem repeats (compared to previous best around 60%), and GPT-5.6-Sol showed substantial uplift from filler tokens and problem repeats across datasets, with performance roughly doubling on the 3-hop task.
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