Step-SWE-Bench

Fading

Models fix software issues inside several coding agent harnesses, such as Claude Code, OpenCode and Hermes Agent. The score is the average over harnesses.

StepFun calls it in-house. The post gives per-harness scores for six harnesses and does not describe the tasks.

Made by: StepFun
Released: May 2026
Kind: Fixing real repositories
Level: Expert
Scored: Checked automatically
Answers: Agent task
Tasks: Kept private

Last in a launch post: May 2026, dropped before it saturated
Last model added: May 2026

static.stepfun.com

Model scored in lab cards

Launch post lists it, from 1 lab

Step 3.7 Flash leads with 67.1%

Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.

Bars Table

67.1 Step 3.7 Flash

1 Step 3.7 Flash 67.1%

Source: Labs’ model cards

#	Model	Score	Setting	Date	Source
1	Step 3.7 Flash	67.1%		May 2026	Lab model card

Scores over time

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Reported by the lab in its model card

Source: Labs’ model cards

Labs headline it less often now, last in May 2026

Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.

StepFun

Date	Launch post	Score	As the post writes it
May 29, 2026	Step 3.7 Flash	67.1	Step-SWE-Bench avg over six harnesses

Step 3.7 Flash leads with 67.1%

Scores over time

Labs headline it less often now, last in May 2026

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