Verified Run by us through Codex, locked to the cube tools. Finished 26 Oct 2026 19:25 UTC.
GPT-6.1 Terra scores 12.6 at medium, well below its best max result of 62.0. Its max result puts it 3rd of 18 models on the Index, not this effort. On the interactive 2×2 ladder, it solved the first 2 levels, then gave up on level 3 with all 3 lives left.
The 2×2 round ended after 19 s and 7 moves in total. On the interactive 3×3, it reached level 3 before giving up on level 4, again with 3 lives left; that round took 45 s, the longest of the suite. The one-shot 3×3 ended at the same level through a different route: all 3 answers at level 4 failed, exhausting its lives in 30 s. The Gauntlet stayed locked.
We finished the medium suite in 94 s, 33 s longer than low for the same score. Higher efforts ranged from 130 s at high to about 1 h 15 min for the best max run. API-equivalent costs are unavailable for these runs.
At medium, it solved 2 levels, then gave up on level 3 with all 3 lives left, without making a move on that cube. Level 2 took 11 s of the round’s 19 s and needed 6 moves, 4 more than the scramble. Level 1 was solved in 1 move in 3 s; there were no misses before it stopped.
At medium, it solved through level 3 of 20, then gave up on level 4 with all 3 lives left. The first two cubes took 5 s combined, each solved by exactly undoing the scramble; level 3 needed 8 moves, 5 more than the scramble. Level 4 took 26 s of the round’s 45 s, ending after 7 moves against a limit of 48.
It reached level 3 of 20, then lost all 3 lives on wrong answers at level 4. The first 3 solutions exactly reversed their scrambles; level 3 took 11 s, the longest attempt in a 30 s round. Each failed answer contained 4 moves, matching the scramble length but leaving the cube unsolved.