SUDOKU BENCHMARK ยท COZY

Qwen3.8 Flash-Next on Cozy grid 3

Solved: 49 of 49 blank cells right. It said it was 100% sure. All of Qwen3.8 Flash-Next's answers.

RESULTSolved
CELLS RIGHT49 / 49
SAID100% sure
MODEL TIME9.2 min
COSTlocal, no list price
TOKENS IN / OUT356 / 13,547

5 given 5 filled correctly 53 wrong, with the right digit 3 left empty

The end of its reply

Looking at this puzzle, I'll work through it systematically using constraint propagation and logical deduction.

**Key deductions:**
1. R1C8 must be 4 (only value fitting row, column, and box constraints)
2. R1C9 = 2 (after eliminating 7,8 as a pair in R1C1/R1C7)
3. R7C5 = 1 (only value in box 8 that fits column 5)
4. R8C5 = 3 (only value remaining in box 8 for that cell)
5. R5C4 = 3 (forced by box 5 constraints)
6. R4C4 = 6, R3C4 = 1 (propagated from column 4)
7. R4C5 = 5, R5C6 = 9, R6C6 = 4, R6C5 = 2 (box 5 completions)
8. R5C2 = 1, R5C3 = 2 (only placements in box 4)
9. R8C1 = 2 (only cell in column 1 that can hold 2)
10. R8C7 = 4 (only cell in box 9 that can hold 4)
11. R1C7 = 7, R1C1 = 8, R3C1 = 7, R3C9 = 8 (propagated)
12. Remaining cells cascade uniquely through the rest.

<grid>
861593742
945287613
723146598
378651924
412379856
659824137
534718269
286935471
197462385
</grid>
<confidence>100</confidence>

Grid cozy-2 of set v1, 32 givens. Puzzle as one line: .61593....4.2......23...59......1.244...7...665.8......3...826...6..5.7....46238.