Language

Step3

By StepFun, in the Step family.

Released
Jul 2025
Status
Legacy
Context
65.5K
Max output
—
Input per 1M tokens
—
Output per 1M tokens
—
Open weights
Yes
License
apache-2.0
Parameters
321B, 38B active
Knowledge cutoff
—
Reasoning
Yes
Modalities
text, image → text

Category scores

Out of 100, from independent and third-party results only, by method category-2026-09-29.1.

Category scores
CategoryScoreRankCoverage
Human preference42.8Not ranked1 of 5

Benchmark results

Every result we hold for this model, with who ran it and where it was published.

Human preference

Human preference results
BenchmarkMetricValueProvenanceSettingEvaluatedSource
Text Arena (arena.ai)Arena score (Elo scale)1349Independent—25 Sep 2026Arena
Text Arena (arena.ai)Votes6267Independent—25 Sep 2026Arena
Vision Arena (arena.ai)Arena score (Elo scale)1145Independent—28 Sep 2026Arena
Vision Arena (arena.ai)Votes3199Independent—28 Sep 2026Arena

Other Step versions

Sources