GPT-6 Astra (none) ( no reasoning pass) scores 83±6% on frontiermath tier 4, exactly the same as GPT-5.6 Sol (max). (astra with reasoning scores 95±3%)
That means the tier four example problems might be of a good reference class.
(Such a high score, with no COT, maybe makes contamination more likely as an explanation)
I was trying to answer the slightly more general question, “what sorts of math benchmark questions can astra purportedly solve with no COT”.