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GLM 5.3 Flash vs GPT 6 Luna low

GLM 5.3 Flash leads on quality: 9.8 points higher; GPT 6 Luna low leads on cost and agent time: 7.7× cheaper and 3.9× faster.

24 tasksData from

Stet score

GLM 5.3 FlashRank 13 of 14

31.095% range 21.5–41.59.8 points higher

GPT 6 Luna lowRank 14 of 14

21.295% range 12.5–31.2

A directional read: their 95% score ranges overlap.

Cost / task

GLM 5.3 Flash$0.41
GPT 6 Luna low$0.057.7× cheaper

Agent time / task

GLM 5.3 Flash26.7 min
GPT 6 Luna low6.9 min3.9× faster

Task by task

GLM 5.3 Flash solved 4 tasks that GPT 6 Luna low didn’t, and GPT 6 Luna low solved 0 that GLM 5.3 Flash didn’t. Both solved 5; neither solved 14.

GLM 5.3 Flash only 4

  • stet-5276aa3fPassed tests
  • stet-commit-bbbbae09Passed tests
  • stet-66762b4cPassed tests
  • stet-commit-f0caded9Passed tests

GPT 6 Luna low only 0

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. 1 of the 24 tasks is left out because one of the two has no scored result on it.

All 23 compared tasks
Task by task
TaskGLM 5.3 FlashGPT 6 Luna lowSolved by
stet-3169aefaPassed testsPassed testsBoth
stet-89dfbc27Passed testsPassed testsBoth
stet-b28f4fe7Passed testsPassed testsBoth
stet-232b50baPassed testsPassed testsBoth
stet-5276aa3fPassed testsFailedGLM 5.3 Flash only
stet-commit-bbbbae09Passed testsNo change madeGLM 5.3 Flash only
stet-15439c21Passed testsPassed testsBoth
stet-66762b4cPassed testsFailedGLM 5.3 Flash only
stet-commit-f0caded9Passed testsFailedGLM 5.3 Flash only
stet-commit-5d766ddeFailedNo change madeNeither
stet-43493c52FailedFailedNeither
stet-6f84e978FailedFailedNeither
stet-commit-f8ae1177FailedNo change madeNeither
stet-2450ca2dFailedFailedNeither
stet-commit-342d0ac0FailedFailedNeither
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
MetricGLM 5.3 FlashGPT 6 Luna low
Rank13 of 1414 of 14
Stet score31.095% range 21.5–41.521.295% range 12.5–31.2
Solved9/249 passed, 0 judged equivalent5/245 passed, 0 judged equivalent
Passed review6/231 not recorded5/204 not recorded
Matched merged change6/245/204 not recorded
Cost / task$0.41$0.05
How cost was recordedestimated from tokensreported by its harness
Agent time / task26.7 min6.9 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.

GLM 5.3 Flash matched the merged change more often: 6 of 11 to GPT 6 Luna low’s 5.

Changes up to 150 lines
GLM 5.3 FlashGPT 6 Luna low
Matched merged change6/115/11
Passed review6/101 not recorded5/11
Cost / task$0.06$0.02
Agent time / task10.2 min2.1 min

Small fixes

7 tasks

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

Both matched the merged change on 5 of 7.

Small fixes
GLM 5.3 FlashGPT 6 Luna low
Matched merged change5/75/7
Passed review5/75/7
Cost / task$0.05$0.01
Agent time / task9.4 min2.1 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
GLM 5.3 FlashGPT 6 Luna low
Matched merged change0/130/94 not recorded
Passed review0/130/94 not recorded
Cost / task$0.70$0.08
Agent time / task40.7 min11.0 min

See which setup wins on your repo

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