Opus 5 leads on quality, cost and agent time: 24.9 points higher, a little cheaper and a little faster.
Stet score
Opus 4.8Rank 11 of 14
40.295% range 30.3–50.3
Opus 5Rank 3 of 14
65.195% range 54.8–74.924.9 points higher
Opus 4.8 solved 1 task that Opus 5 didn’t, and Opus 5 solved 2 that Opus 4.8 didn’t. Both solved 12; neither solved 9.
stet-commit-60a0e6c2Passed testsstet-2450ca2dPassed testsstet-commit-2826765eEquivalent to the merged fixA 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 | Opus 4.8 | Opus 5 | 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 | Equivalent to the merged fix | Passed tests | Both |
stet-commit-5d766dde | Equivalent to the merged fix | Equivalent to the merged fix | Both |
stet-43493c52 | Passed tests | Passed tests | Both |
stet-6f84e978 | Passed tests | Passed tests | Both |
stet-commit-f8ae1177 | Failed | Failed | Neither |
stet-2450ca2d | Failed | Passed tests | Opus 5 only |
stet-commit-342d0ac0 | Failed | Failed | Neither |
stet-commit-60a0e6c2 | Passed tests | Failed | Opus 4.8 only |
stet-commit-5e075641 | Failed | Failed | Neither |
stet-commit-2826765e | Failed | Equivalent to the merged fix | Opus 5 only |
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 | Opus 4.8 | Opus 5 |
|---|---|---|
| Rank | 11 of 14 | 3 of 14 |
| Stet score | 40.295% range 30.3–50.3 | 65.195% range 54.8–74.9 |
| Solved | 13/2411 passed, 2 judged equivalent | 14/2412 passed, 2 judged equivalent |
| Passed review | 8/231 not recorded | 9/231 not recorded |
| Matched merged change | 11/24 | 13/24 |
| Cost / task | $7.05 | $6.78 |
| How cost was recorded | reported by its harness | reported by its harness |
| Agent time / task | 23.3 min | 23.2 min |
| Ran in | local Docker | sandbox not recorded |
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 5 matched the merged change more often: 10 of 11 to Opus 4.8’s 9.
| Opus 4.8 | Opus 5 | |
|---|---|---|
| Matched merged change | 9/11 | 10/11 |
| Passed review | 8/11 | 9/101 not recorded |
| Cost / task | $1.41 | $1.50 |
| Agent time / task | 12.8 min | 18.4 min |
7 tasks
7 tasks whose instructions start with “Fix”. Their merged changes were 4–29 lines in 1–2 files.
Both matched the merged change on 7 of 7.
| Opus 4.8 | Opus 5 | |
|---|---|---|
| Matched merged change | 7/7 | 7/7 |
| Passed review | 7/7 | 7/7 |
| Cost / task | $1.17 | $0.99 |
| Agent time / task | 9.7 min | 15.9 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 5 matched the merged change more often: 3 of 13 to Opus 4.8’s 2.
| Opus 4.8 | Opus 5 | |
|---|---|---|
| Matched merged change | 2/13 | 3/13 |
| Passed review | 0/121 not recorded | 0/13 |
| Cost / task | $11.83 | $11.24 |
| Agent time / task | 32.2 min | 27.2 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.