GPT-6 Astra lists at $10/$50 per million tokens against GPT-5.6 Sol's $4/$20. A walk through Artificial Analysis's per-task cost figures for both, and the one benchmark where Astra's lower turn count sits beside a lower score.
GSM8k 99%、MMLU 90 出頭、HLE 在 2026 年中已進入 40 分檔。每出一份『更難的 benchmark』看起來都在解決問題，但結構性的事沒變：我們從來沒在驗證模型學會了什麼，只是在量它有沒有看過。
GSM8k at 99%, MMLU at the 88-94% noise band, HLE already in the mid-40s by mid-2026. Each round of harder benchmarks looks like progress, but the field never solved the underlying problem: we measure correlation with a test distribution and call it capability.