DeepSeek V4.1 Flash leads on quality and cost: 7.6 points higher and 14.3× cheaper; Opus 4.8 leads on agent time: 2.1× faster.
Stet score
DeepSeek V4.1 FlashRank 9 of 14
47.895% range 37.5–58.07.6 points higher
Opus 4.8Rank 11 of 14
40.295% range 30.3–50.3
DeepSeek V4.1 Flash solved 1 task that Opus 4.8 didn’t, and Opus 4.8 solved 2 that DeepSeek V4.1 Flash didn’t. Both solved 11; neither solved 10.
stet-commit-342d0ac0Equivalent to the merged fixstet-6f84e978Passed testsstet-commit-60a0e6c2Passed testsA task counts as solved when its tests passed or a judge found the fix equivalent to the merged change, as in the leaderboard’s Solved column. Stet score also weighs code quality, so it can order the two differently.
| Task | DeepSeek V4.1 Flash | Opus 4.8 | Solved by |
|---|---|---|---|
stet-3169aefa | Passed tests | Passed tests | Both |
stet-89dfbc27 | Passed tests | Passed tests | Both |
stet-b28f4fe7 | Passed tests | Passed tests | Both |
stet-232b50ba | Passed tests | Passed tests | Both |
stet-5276aa3f | Passed tests | Passed tests | Both |
stet-commit-bbbbae09 | Passed tests | Passed tests | Both |
stet-15439c21 | Passed tests | Passed tests | Both |
stet-66762b4c | Passed tests | Passed tests | Both |
stet-commit-f0caded9 | Passed tests | Equivalent to the merged fix | Both |
stet-commit-5d766dde | Passed tests | Equivalent to the merged fix | Both |
stet-43493c52 | Passed tests | Passed tests | Both |
stet-6f84e978 | Failed | Passed tests | Opus 4.8 only |
stet-commit-f8ae1177 | Failed | Failed | Neither |
stet-2450ca2d | Failed | Failed | Neither |
stet-commit-342d0ac0 | Equivalent to the merged fix | Failed | DeepSeek V4.1 Flash only |
stet-commit-60a0e6c2 | Failed | Passed tests | Opus 4.8 only |
stet-commit-5e075641 | Failed | Failed | Neither |
stet-commit-2826765e | Failed | Failed | Neither |
stet-commit-a8716b88 | Failed | Failed | Neither |
stet-commit-30506f8e | Failed | Failed | Neither |
stet-commit-87814583 | Failed | Failed | Neither |
stet-commit-d2ab0c25 | Failed | Failed | Neither |
stet-commit-e41c2e2d | Failed | Failed | Neither |
stet-commit-e928166f | Failed | Failed | Neither |
| Metric | DeepSeek V4.1 Flash | Opus 4.8 |
|---|---|---|
| Rank | 9 of 14 | 11 of 14 |
| Stet score | 47.895% range 37.5–58.0 | 40.295% range 30.3–50.3 |
| Solved | 12/2411 passed, 1 judged equivalent | 13/2411 passed, 2 judged equivalent |
| Passed review | 8/24 | 8/231 not recorded |
| Matched merged change | 10/231 not recorded | 11/24 |
| Cost / task | $0.49from 23/24 tasks | $7.05 |
| How cost was recorded | estimated from tokens on 23, not recorded on 1 | reported by its harness |
| Agent time / task | 49.3 min | 23.3 min |
| Ran in | Daytona sandbox | local Docker |
The leaderboard’s readings on groups of tasks. Each group holds fewer tasks than the overall standings, so treat these as leads to test on your repo.
11 tasks
11 tasks whose merged change was 2–149 lines in 1–2 files. The 7 small fixes below are among them.
Opus 4.8 matched the merged change more often: 9 of 11 to DeepSeek V4.1 Flash’s 7.
| DeepSeek V4.1 Flash | Opus 4.8 | |
|---|---|---|
| Matched merged change | 7/11 | 9/11 |
| Passed review | 8/11 | 8/11 |
| Cost / task | $0.21 | $1.41 |
| Agent time / task | 34.9 min | 12.8 min |
7 tasks
7 tasks whose instructions start with “Fix”. Their merged changes were 4–29 lines in 1–2 files.
Opus 4.8 matched the merged change more often: 7 of 7 to DeepSeek V4.1 Flash’s 5.
| DeepSeek V4.1 Flash | Opus 4.8 | |
|---|---|---|
| Matched merged change | 5/7 | 7/7 |
| Passed review | 6/7 | 7/7 |
| Cost / task | $0.19 | $1.17 |
| Agent time / task | 34.6 min | 9.7 min |
13 tasks
13 tasks whose merged change ran over 150 lines or more than 3 files: 113–1,420 lines in 2–19 files.
| DeepSeek V4.1 Flash | Opus 4.8 | |
|---|---|---|
| Matched merged change | 3/121 not recorded | 2/13 |
| Passed review | 0/13 | 0/121 not recorded |
| Cost / task | $0.751 not recorded | $11.83 |
| Agent time / task | 61.5 min | 32.2 min |
Stet replays your merged PRs, scores quality above pass/fail, and delivers comparison reports through your agent.
Run it on your repocompare-n24-r3b.