Opus 4.8 leads on quality and agent time: 9.2 points higher and 1.1× faster; GLM 5.3 Flash leads on cost: 17.2× cheaper.
Stet score
GLM 5.3 FlashRank 13 of 14
31.095% range 21.5–41.5
Opus 4.8Rank 11 of 14
40.295% range 30.3–50.39.2 points higher
GLM 5.3 Flash solved 0 tasks that Opus 4.8 didn’t, and Opus 4.8 solved 4 that GLM 5.3 Flash didn’t. Both solved 9; neither solved 11.
stet-commit-5d766ddeEquivalent to the merged fixstet-43493c52Passed testsstet-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 | GLM 5.3 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 | Failed | Equivalent to the merged fix | Opus 4.8 only |
stet-43493c52 | Failed | Passed tests | Opus 4.8 only |
stet-6f84e978 | Failed | Passed tests | Opus 4.8 only |
stet-commit-f8ae1177 | Failed | Failed | Neither |
stet-2450ca2d | Failed | Failed | Neither |
stet-commit-342d0ac0 | Failed | Failed | Neither |
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 | GLM 5.3 Flash | Opus 4.8 |
|---|---|---|
| Rank | 13 of 14 | 11 of 14 |
| Stet score | 31.095% range 21.5–41.5 | 40.295% range 30.3–50.3 |
| Solved | 9/249 passed, 0 judged equivalent | 13/2411 passed, 2 judged equivalent |
| Passed review | 6/231 not recorded | 8/231 not recorded |
| Matched merged change | 6/24 | 11/24 |
| Cost / task | $0.41 | $7.05 |
| How cost was recorded | estimated from tokens | reported by its harness |
| Agent time / task | 26.7 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 GLM 5.3 Flash’s 6.
| GLM 5.3 Flash | Opus 4.8 | |
|---|---|---|
| Matched merged change | 6/11 | 9/11 |
| Passed review | 6/101 not recorded | 8/11 |
| Cost / task | $0.06 | $1.41 |
| Agent time / task | 10.2 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 GLM 5.3 Flash’s 5.
| GLM 5.3 Flash | Opus 4.8 | |
|---|---|---|
| Matched merged change | 5/7 | 7/7 |
| Passed review | 5/7 | 7/7 |
| Cost / task | $0.05 | $1.17 |
| Agent time / task | 9.4 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.
Opus 4.8 matched the merged change more often: 2 of 13 to GLM 5.3 Flash’s 0.
| GLM 5.3 Flash | Opus 4.8 | |
|---|---|---|
| Matched merged change | 0/13 | 2/13 |
| Passed review | 0/13 | 0/121 not recorded |
| Cost / task | $0.70 | $11.83 |
| Agent time / task | 40.7 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.