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DeepSeek V4.1 Flash max vs SWE-2 Max high

No clear quality winner: SWE-2 Max high won 13, DeepSeek V4.1 Flash max won 5, 6 tied; DeepSeek V4.1 Flash max leads on agent time: 1.4× faster; SWE-2 Max high’s cost wasn’t recorded.

24 tasksData from

Stet score

DeepSeek V4.1 Flash maxdeepseek-harness · max reasoningRank 10 of 15

46.995% range 36.5–57.2

SWE-2 Max highdevin · high reasoningRank 2 of 15

65.195% range 55.2–74.718.2 points higher

A directional read: their 95% score ranges overlap.

Cost / task

DeepSeek V4.1 Flash max$0.49from 23/24 tasks
SWE-2 Max highnot recorded

Agent time / task

DeepSeek V4.1 Flash max49.3 min1.4× faster
SWE-2 Max high68.3 min

Quality

Head-to-head matchups

DeepSeek V4.1 Flash max won5

Tied6

SWE-2 Max high won13

SWE-2 Max high’s win share 67%, 95% range 52–82%Ties are within judge noise.

Task by task

DeepSeek V4.1 Flash max solved 1 task that SWE-2 Max high didn’t, and SWE-2 Max high solved 5 that DeepSeek V4.1 Flash max didn’t. Both solved 11; neither solved 7.

DeepSeek V4.1 Flash max only 1

  • stet-43493c52Passed tests

SWE-2 Max high only 5

  • stet-6f84e978Passed tests
  • stet-2450ca2dPassed tests
  • stet-commit-60a0e6c2Passed tests
  • stet-commit-5e075641Passed tests
  • stet-commit-a8716b88Equivalent 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 maxSWE-2 Max 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-15439c21Passed testsEquivalent to the merged fixBoth
stet-66762b4cPassed testsPassed testsBoth
stet-commit-5d766ddePassed testsPassed testsBoth
stet-commit-f0caded9Passed testsPassed testsBoth
stet-43493c52Passed testsFailedDeepSeek V4.1 Flash max only
stet-6f84e978FailedPassed testsSWE-2 Max high only
stet-2450ca2dFailedPassed testsSWE-2 Max high only
stet-commit-f8ae1177FailedFailedNeither
stet-commit-342d0ac0Equivalent to the merged fixEquivalent to the merged fixBoth
stet-commit-60a0e6c2FailedPassed testsSWE-2 Max high only
stet-commit-5e075641FailedPassed testsSWE-2 Max high only
stet-commit-2826765eFailedFailedNeither
stet-commit-a8716b88FailedEquivalent to the merged fixSWE-2 Max high only
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 maxSWE-2 Max high
Harnessdeepseek-harnessdevin
Reasoning effortmaxhigh
Rank10 of 152 of 15
Stet score46.995% range 36.5–57.265.195% range 55.2–74.7
Solved12/2411 passed, 1 judged equivalent16/2413 passed, 3 judged equivalent
Cost / task$0.49from 23/24 tasksnot recorded
Agent time / task49.3 min68.3 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 15 setups: bmk_d4ba310fdf50db4ccb2092e3.

See all 15 setups on the leaderboardHow Stet measures