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GLM 5.3 Flash high vs Pareto 26.9 medium

No clear quality winner: Pareto 26.9 medium won 16, GLM 5.3 Flash high won 4, 4 tied; GLM 5.3 Flash high leads on cost and agent time: 30.4× cheaper and 1.5× faster.

24 tasksData from

Stet score

GLM 5.3 Flash highcodex · high reasoningRank 15 of 16

29.095% range 19.9–39.3

Pareto 26.9 mediumclaude-code · medium reasoningRank 7 of 16

57.195% range 47.0–66.728.1 points higher

Their 95% score ranges don’t overlap.

Cost / task

GLM 5.3 Flash high$0.4130.4× cheaper
Pareto 26.9 medium$12.47

Agent time / task

GLM 5.3 Flash high26.7 min1.5× faster
Pareto 26.9 medium39.2 min

Quality

Head-to-head matchups

GLM 5.3 Flash high won4

Tied4

Pareto 26.9 medium won16

Pareto 26.9 medium’s win share 76%, 95% range 60–90%Ties are within judge noise.

Task by task

GLM 5.3 Flash high solved 0 tasks that Pareto 26.9 medium didn’t, and Pareto 26.9 medium solved 4 that GLM 5.3 Flash high didn’t. Both solved 9; neither solved 11.

GLM 5.3 Flash high only 0

Pareto 26.9 medium only 4

  • stet-43493c52Passed tests
  • stet-6f84e978Passed tests
  • stet-2450ca2dPassed tests
  • stet-commit-f8ae1177Passed 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
TaskGLM 5.3 Flash highPareto 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-5d766ddeFailedFailedNeither
stet-43493c52FailedPassed testsPareto 26.9 medium only
stet-commit-f0caded9Passed testsEquivalent to the merged fixBoth
stet-6f84e978FailedPassed testsPareto 26.9 medium only
stet-2450ca2dFailedPassed testsPareto 26.9 medium only
stet-commit-342d0ac0FailedFailedNeither
stet-commit-f8ae1177FailedPassed testsPareto 26.9 medium only
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
MetricGLM 5.3 Flash highPareto 26.9 medium
Harnesscodexclaude-code
Reasoning efforthighmedium
Rank15 of 167 of 16
Stet score29.095% range 19.9–39.357.195% range 47.0–66.7
Solved9/249 passed, 0 judged equivalent13/2412 passed, 1 judged equivalent
Cost / task$0.41$12.47
Agent time / task26.7 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