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DeepSeek V4.1 Flash vs GPT 6.1 Sol medium

GPT 6.1 Sol medium leads on quality and agent time: 17.5 points higher and 4.2× faster; DeepSeek V4.1 Flash leads on cost: 2.2× cheaper.

24 tasksData from

Stet score

DeepSeek V4.1 FlashRank 9 of 14

47.895% range 37.5–58.0

GPT 6.1 Sol mediumRank 2 of 14

65.395% range 55.6–74.617.5 points higher

A directional read: their 95% score ranges overlap.

Cost / task

DeepSeek V4.1 Flash$0.492.2× cheaperfrom 23/24 tasks
GPT 6.1 Sol medium$1.10

Agent time / task

DeepSeek V4.1 Flash49.3 min
GPT 6.1 Sol medium11.8 min4.2× faster

Task by task

DeepSeek V4.1 Flash solved 1 task that GPT 6.1 Sol medium didn’t, and GPT 6.1 Sol medium solved 2 that DeepSeek V4.1 Flash didn’t. Both solved 11; neither solved 10.

DeepSeek V4.1 Flash only 1

  • stet-commit-f0caded9Passed tests

GPT 6.1 Sol medium only 2

  • stet-6f84e978Equivalent to the merged fix
  • 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
TaskDeepSeek V4.1 FlashGPT 6.1 Sol 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-15439c21Passed testsPassed testsBoth
stet-66762b4cPassed testsPassed testsBoth
stet-commit-f0caded9Passed testsFailedDeepSeek V4.1 Flash only
stet-commit-5d766ddePassed testsEquivalent to the merged fixBoth
stet-43493c52Passed testsPassed testsBoth
stet-6f84e978FailedEquivalent to the merged fixGPT 6.1 Sol medium only
stet-commit-f8ae1177FailedPassed testsGPT 6.1 Sol medium only
stet-2450ca2dFailedFailedNeither
stet-commit-342d0ac0Equivalent to the merged fixEquivalent to the merged fixBoth
stet-commit-60a0e6c2FailedFailedNeither
stet-commit-5e075641FailedFailedNeither
stet-commit-2826765eFailedFailedNeither
stet-commit-a8716b88FailedFailedNeither
stet-commit-30506f8eFailedFailedNeither
stet-commit-87814583FailedFailedNeither
stet-commit-d2ab0c25FailedFailedNeither
stet-commit-e41c2e2dFailedFailedNeither
stet-commit-e928166fFailedFailedNeither

Side by side

Side by side
MetricDeepSeek V4.1 FlashGPT 6.1 Sol medium
Rank9 of 142 of 14
Stet score47.895% range 37.5–58.065.395% range 55.6–74.6
Solved12/2411 passed, 1 judged equivalent13/2410 passed, 3 judged equivalent
Passed review8/2410/24
Matched merged change10/231 not recorded10/24
Cost / task$0.49from 23/24 tasks$1.10
How cost was recordedestimated from tokens on 23, not recorded on 1estimated from tokens
Agent time / task49.3 min11.8 min
Ran inDaytona sandboxDaytona sandbox

Where each setup is the better choice

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.

Changes up to 150 lines

11 tasks

11 tasks whose merged change was 2–149 lines in 1–2 files. The 7 small fixes below are among them.

Both matched the merged change on 7 of 11.

Changes up to 150 lines
DeepSeek V4.1 FlashGPT 6.1 Sol medium
Matched merged change7/117/11
Passed review8/118/11
Cost / task$0.21$0.47
Agent time / task34.9 min5.8 min

Small fixes

7 tasks

7 tasks whose instructions start with “Fix”. Their merged changes were 4–29 lines in 1–2 files.

GPT 6.1 Sol medium matched the merged change more often: 6 of 7 to DeepSeek V4.1 Flash’s 5.

Small fixes
DeepSeek V4.1 FlashGPT 6.1 Sol medium
Matched merged change5/76/7
Passed review6/75/7
Cost / task$0.19$0.42
Agent time / task34.6 min5.3 min

Larger changes

13 tasks

13 tasks whose merged change ran over 150 lines or more than 3 files: 113–1,420 lines in 2–19 files.

Larger changes
DeepSeek V4.1 FlashGPT 6.1 Sol medium
Matched merged change3/121 not recorded3/13
Passed review0/132/13
Cost / task$0.751 not recorded$1.63
Agent time / task61.5 min16.9 min

From the leaderboard’s routing advice

  • Small fix: to spend less, use GPT 6.1 Sol medium.
  • Larger change: use GPT 6.1 Sol medium.
  • Anything else: use GPT 6.1 Sol medium.

See which setup wins on your repo

Stet replays your merged PRs, scores quality above pass/fail, and delivers comparison reports through your agent.

Run it on your repo

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 14 setups: compare-n24-r3b.

See all 14 setups on the leaderboardHow Stet measures