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DeepSeek V4.1 Flash max vs Muse Spark 1.3 high

No clear quality winner: DeepSeek V4.1 Flash max won 13, Muse Spark 1.3 high won 5, 6 tied; Muse Spark 1.3 high leads on cost and agent time: 4.9× cheaper and 3.7× faster.

24 tasksData from

Stet score

DeepSeek V4.1 Flash maxdeepseek-harness · max reasoningRank 11 of 16

45.995% range 35.5–56.114.0 points higher

Muse Spark 1.3 highmuse · high reasoningRank 14 of 16

31.995% range 23.5–40.6

A directional read: their 95% score ranges overlap.

Cost / task

DeepSeek V4.1 Flash max$0.49from 23/24 tasks
Muse Spark 1.3 high$0.104.9× cheaper

Agent time / task

DeepSeek V4.1 Flash max49.3 min
Muse Spark 1.3 high13.2 min3.7× faster

Quality

Head-to-head matchups

DeepSeek V4.1 Flash max won13

Tied6

Muse Spark 1.3 high won5

DeepSeek V4.1 Flash max’s win share 65%, 95% range 49–80%Ties are within judge noise.

Task by task

DeepSeek V4.1 Flash max solved 3 tasks that Muse Spark 1.3 high didn’t, and Muse Spark 1.3 high solved 1 that DeepSeek V4.1 Flash max didn’t. Both solved 9; neither solved 11.

DeepSeek V4.1 Flash max only 3

  • stet-15439c21Passed tests
  • stet-commit-f0caded9Passed tests
  • stet-commit-342d0ac0Equivalent to the merged fix

Muse Spark 1.3 high only 1

  • stet-2450ca2dEquivalent to the merged fix

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
TaskDeepSeek V4.1 Flash maxMuse Spark 1.3 highSolved 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 testsFailedDeepSeek V4.1 Flash max only
stet-commit-5d766ddePassed testsEquivalent to the merged fixBoth
stet-43493c52Passed testsPassed testsBoth
stet-commit-f0caded9Passed testsFailedDeepSeek V4.1 Flash max only
stet-6f84e978FailedFailedNeither
stet-2450ca2dFailedEquivalent to the merged fixMuse Spark 1.3 high only
stet-commit-342d0ac0Equivalent to the merged fixFailedDeepSeek V4.1 Flash max only
stet-commit-f8ae1177FailedFailedNeither
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
MetricDeepSeek V4.1 Flash maxMuse Spark 1.3 high
Harnessdeepseek-harnessmuse
Reasoning effortmaxhigh
Rank11 of 1614 of 16
Stet score45.995% range 35.5–56.131.995% range 23.5–40.6
Solved12/2411 passed, 1 judged equivalent10/248 passed, 2 judged equivalent
Cost / task$0.49from 23/24 tasks$0.10
Agent time / task49.3 min13.2 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