The ARC-AGI-3 scorecard is extremely misleading given that it clearly states itself that "with [the responses API] harness, we estimate Sol would score in the ballpark of ~30%." but it shows a score of 7.8% for GPT-5.6 Sol presumably since if they updated the percentage for GPT-5.6 Sol to the score it would receive with the responses API harness they used for GPT-6 Astra they'd have to do the same for the percentage…
They still seem pretty horrible at writing. Overly complicated prose, weird phrasing, poorly structured paragraphs. I don't know why they're so bad at communicating, but I feel very confident that humans are still much better at writing than any of these LLM models are, regardless of how advanced they are in other areas.
As a non-native English speaker, I think the current LLMs write better English than me. I still write better than them in my native language (Norwegian), but the same cannot be said about most of my compatriots.