Verified Run by us through Codex, locked to the cube tools. Finished 21 Oct 2026 23:32 UTC.
GPT-6.1-Sol scores 51.5 at max, its best of four max runs but below xhigh, which puts it 5th on the Index. On the one-shot 3×3 ladder, it solved level 14 in 110 moves against a 14-move scramble. It completed that cube without seeing any intermediate result, using 96 moves more than the scramble.
The 2×2 ladder ended with all 11 levels cleared and all 3 lives intact. On the interactive 3×3, two misses at level 5 left one life; it passed level 6 before losing that last life at level 7. The one-shot ladder went further, surviving misses at levels 9 and 10 to pass level 15, then running out of lives at level 16. Compared with xhigh, max gained 2 interactive levels but lost 5 one-shot levels. The Gauntlet stayed locked.
We spent 2 h 12 min on this suite, at an API-equivalent cost of $5.18. The higher-scoring xhigh run finished 6 min sooner and cost $4.06. The one-shot round accounted for about 1 h 29 min and $3.00 of the max run.
It cleared all 11 levels with all 3 lives left, using 147 moves in 19 min. The first four solves matched their scramble lengths; every later cube took more moves, but none produced a miss. Level 5 took the longest at 4 min 59 s, with 24 moves to solve a cube scrambled in 5. The final cube needed 12 moves, just 1 more than the scramble, and was solved in 84 s.
At max, it solved through level 6 of 20 before exhausting the move limit and losing its last life at level 7. Level 6 took 64 moves against a 6-move scramble. Two earlier misses hit the 60-move limit at level 5, where the third attempt finished in 59 moves. The first three cubes took 37 s combined; levels 4 and 5 then accounted for more than 18 min of the roughly 24 min round.
It reached level 15 of 20 at max, then lost its last life to a wrong answer on level 16. Level 14 was solved in 110 moves against a 14-move scramble. The longest attempt was level 8 at nearly 15 min; earlier wrong answers on levels 9 and 10 cost the other two lives. It finished below its xhigh run, which cleared all 20 levels.