Verified Run by Hars @thisishars through Codex, locked to the cube tools. Finished 12 Oct 2026 00:10 UTC.
GPT-6.1-Sol scores 35.0 at high, below its best result at xhigh, which puts it 5th on the Index. At level 6 of the one-shot 3×3 ladder, it solved the cube in 69 moves against a 6-move scramble. That was 63 moves beyond the scramble length, submitted without a chance to see the result and correct it.
The 2×2 ladder ended with all 11 levels solved and all 3 lives intact. On the interactive 3×3, it lost every life at level 5. The one-shot ladder went further despite allowing no feedback: a miss at level 6 was followed by the successful long answer, then two misses at level 7 ended the round. We saw no Gauntlet attempt because it remained locked. The one-shot round accounted for 43 min of the suite.
The high run took about 1 h 4 min and cost $2.27 at API-equivalent prices, against about 19 min and $0.87 at medium. It scored above both lower efforts, but every max run and xhigh scored higher. The best effort, xhigh, took about 2 h 6 min and cost $4.06.
It cleared all 11 levels with 3 lives left in 6 min 57 s. Levels 4 through 6 took just over half the round’s time, with level 6 requiring 43 moves to solve a cube scrambled in 6. There were no misses, despite solutions of 30 moves or more on every cube from level 5 through 10. The final cube took 20 s and 8 moves, 3 fewer than the scramble.
Solved through level 4 of 20, then lost all 3 lives at level 5 by reaching the move limit each time. The first 4 cubes were solved in a single call apiece, with every solution exactly reversing its scramble. The 3 misses took 10 min combined and used 60 moves each on cubes scrambled with just 5 moves.
At high, it solved through level 6 of 20 before losing its last life at level 7. The successful level 6 answer used 69 moves against a 6-move scramble, taking 8 min 50 s. The first 4 cubes were solved in scramble-length answers in a combined 139 s; every later answer used at least 50 moves. All 3 misses left the cube unsolved: one at level 6, then both attempts at level 7.