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GPT 6.1 Sol medium vs Pareto 26.9 medium

No clear quality winner: GPT 6.1 Sol medium won 13, Pareto 26.9 medium won 7, 4 tied; GPT 6.1 Sol medium leads on cost and agent time: 11.3× cheaper and 3.3× faster.

24 tasksData from

Stet score

GPT 6.1 Sol mediumcodex · medium reasoningRank 4 of 16

62.595% range 53.0–71.75.4 points higher

Pareto 26.9 mediumclaude-code · medium reasoningRank 7 of 16

57.195% range 47.0–66.7

A directional read: their 95% score ranges overlap.

Cost / task

GPT 6.1 Sol medium$1.1011.3× cheaper
Pareto 26.9 medium$12.47

Agent time / task

GPT 6.1 Sol medium11.8 min3.3× faster
Pareto 26.9 medium39.2 min

Quality

Head-to-head matchups

GPT 6.1 Sol medium won13

Tied4

Pareto 26.9 medium won7

GPT 6.1 Sol medium’s win share 61%, 95% range 44–77%Ties are within judge noise.

Task by task

GPT 6.1 Sol medium solved 2 tasks that Pareto 26.9 medium didn’t, and Pareto 26.9 medium solved 2 that GPT 6.1 Sol medium didn’t. Both solved 11; neither solved 9.

GPT 6.1 Sol medium only 2

  • stet-commit-5d766ddeEquivalent to the merged fix
  • stet-commit-342d0ac0Equivalent to the merged fix

Pareto 26.9 medium only 2

  • stet-commit-f0caded9Equivalent to the merged fix
  • stet-2450ca2dPassed tests

A 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.

All 24 compared tasks
Task by task
TaskGPT 6.1 Sol mediumPareto 26.9 mediumSolved by
stet-3169aefaPassed testsPassed testsBoth
stet-89dfbc27Passed testsPassed testsBoth
stet-b28f4fe7Passed testsPassed testsBoth
stet-232b50baPassed testsPassed testsBoth
stet-5276aa3fPassed testsPassed testsBoth
stet-commit-bbbbae09Passed testsPassed testsBoth
stet-66762b4cPassed testsPassed testsBoth
stet-15439c21Passed testsPassed testsBoth
stet-commit-5d766ddeEquivalent to the merged fixFailedGPT 6.1 Sol medium only
stet-43493c52Passed testsPassed testsBoth
stet-commit-f0caded9FailedEquivalent to the merged fixPareto 26.9 medium only
stet-6f84e978Equivalent to the merged fixPassed testsBoth
stet-2450ca2dFailedPassed testsPareto 26.9 medium only
stet-commit-342d0ac0Equivalent to the merged fixFailedGPT 6.1 Sol medium only
stet-commit-f8ae1177Passed testsPassed testsBoth
stet-commit-60a0e6c2FailedFailedNeither
stet-commit-5e075641FailedFailedNeither
stet-commit-2826765eFailedFailedNeither
stet-commit-a8716b88FailedFailedNeither
stet-commit-e928166fFailedFailedNeither
stet-commit-30506f8eFailedFailedNeither
stet-commit-87814583FailedFailedNeither
stet-commit-d2ab0c25FailedFailedNeither
stet-commit-e41c2e2dFailedFailedNeither

Side by side

Side by side
MetricGPT 6.1 Sol mediumPareto 26.9 medium
Harnesscodexclaude-code
Reasoning effortmediummedium
Rank4 of 167 of 16
Stet score62.595% range 53.0–71.757.195% range 47.0–66.7
Solved13/2410 passed, 3 judged equivalent13/2412 passed, 1 judged equivalent
Cost / task$1.10$12.47
Agent time / task11.8 min39.2 min

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About this data

  • 24 tasks, each a merged change replayed from the repo as it was just before the merge.
  • Data from .
  • Both setups come from the same leaderboard run of 16 setups: bmk_d4ba310fdf50db4ccb2092e3.

See all 16 setups on the leaderboardHow Stet measures