Claude Opus 5.5 on Expert grid 1
Solved: 58 of 58 blank cells right. It said it was 99% sure. All of Claude Opus 5.5's answers.
RESULTSolved
CELLS RIGHT58 / 58
SAID99% sure
MODEL TIME2.6 min
COST$0.383 (API-equivalent)
TOKENS IN / OUT909 / 18,807
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5 given 5 filled correctly 53 wrong, with the right digit 3 left empty
The end of its reply
The grid below is complete and checked: every row, column and box holds 1–9 once, and all 23 givens are unchanged.
**Main deductions**
- r3c9 = 8, since column 9 and box 3 leave only 8.
- r8c6 = 7, r9c1 = 7 and r5c9 = 6: each is the only place for that digit in its row or column.
- In column 3, the 2 and 5 can only go in r1c3 and r2c3. That makes r3c1 = 6 and r3c2 = 4, which then forces r8c3 = 4 and r5c1 = 4.
- 6 in row 2 can only go in r2c4. This gives r1c4 = 1 and r2c1 = 1. It also creates a {3,8} pair at r4c1 and r5c3, and forces r9c6 = 2.
- In row 7, the 1 and 6 can only go in r7c3 and r7c7, so I tried both options:
- **If r7c3 = 1**, the grid fills until row 1 needs its 7 at r1c7. Column 8 also needs its 7 at r2c8. Both cells are in box 3, so this case fails.
- **So r7c3 = 6**, and the rest follows by singles. Examples: r2c7 = 4, r1c6 = 5, r4c5 = 5, r5c5 = 2 and r6c8 = 7.
<grid>
832145769
175698423
649273518
397856241
458721936
261439875
526384197
914567382
783912654
</grid>
<confidence>99</confidence>Grid expert-0 of set v1, 23 givens. Puzzle as one line: .......6..7.........92.3.1...7..6.4..5.7.1...2..4....552......79...6.3......1...4