Claude Opus 5 solved a screenshot-only Rubik’s Cube benchmark in 44 minutes
Various-Affect4841 · reddit · 2026-07-26
- A new benchmark called TWIST tests models on Rubik’s cubes where they can only perceive the state through screenshots.
- Claude Opus 5 solved a 20-move scramble on the 3×3 cube.
- Reported stats: 83 moves (vs. 19 optimal by kociemba), 44 minutes wall clock, 2617 seconds of thinking, 25 seconds of cube movement, 73 screenshots, 240k tokens, max effort.
- The author notes that some of the planning may be aided by retrieval because cube algorithms are common in training data.
- A mirror cube variant is planned as a control to remove color-based cues.
More from Models
- Repligate says Claude Opus 3 appears to evolve without changing its weights — repligate · 2026-07-27
- “Opus 5” post lands as a rebenchmarking-at-scale AI joke — kalomaze · 2026-07-27
- Top models now write worse than a year ago, critic says — dbreunig · 2026-07-27
- MPT-30B radar charts became an unexpectedly controversial design choice — code_star · 2026-07-27
- Local Gemma 4 31B starts acting sarcastic and users cannot reproduce it — n0head_r · 2026-07-27
- Google’s Gemini 3.6 Flash could win by matching Sonnet quality at a lower cost — haider1 · 2026-07-27