Artificials
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StepFun

10 models on Artificials, 3 with published test results and 3 with open weights you can download.

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Best on the capability indexNot yetNone of its models is on the index yet
Best rankTop 14%Step 5 Preview on Arena coding
Newest releaseStep 5 PreviewSep 16, 2026
Models103 tested, 3 with open weights

Where StepFun stands

Its best model’s rank among all models tested on each skill area’s main test, the same tests model pages use. A longer bar means a better rank.

  • OverallStep 5 Preview on Arena text
    Top 16%
  • CodingStep 5 Preview on Arena coding
    Top 14%
  • MathStep 3.5 Flash on Arena math
    Top 35%
  • LanguageStep 5 Preview on Arena creative writing
    Top 19%
  • ReasoningStep 5 Preview on Arena hard prompts
    Top 14%

Every test

Its best result on each published test, and that result’s rank among every model tested. Scores from different tests are never combined.

TestBest modelScoreRank
Arena codingStep 5 Preview1511#51 of 384
Arena hard promptsStep 5 Preview1482#53 of 389
Arena instruction followingStep 5 Preview1445#62 of 389
Arena textStep 5 Preview1454#62 of 389
Arena creative writingStep 5 Preview1421#71 of 387
Arena WebDevStep 5 Preview (high)1570#30 of 123
Arena mathStep 3.5 Flash1408#129 of 372

Every model

Newest first. The price is per 1M tokens, blended three input tokens to one output token: StepFun’s own listing, or else the middle price across hosts.

ModelReleasedContextPriceCapability index
Step 5 PreviewSep 16, 20261M tokens$1.40Not on the index
Step 3.7 FlashMay 29, 2026256K tokens$0.416Not on the index
StepAudio 2.5 ASRApr 24, 2026Not reportedNo paid listingNot on the index
StepAudio 2.5 TTSApr 16, 2026Not reportedNo paid listingNot on the index
Step 3.5 Flash 2603Apr 2, 2026256K tokens$0.15Not on the index
Step TTS 2Mar 1, 2026Not reportedNo paid listingNot on the index
Step 3.5 FlashJan 29, 2026256K tokens$0.15Not on the index
Step-3Jul 31, 202565.5K tokens$0.30Not on the index
Step 1Jan 1, 202532.8K tokens$3.94Not on the index
Step 2Jan 1, 202516.4K tokens$8.02Not on the index

Models, prices, context windows and release dates from models.dev (MIT). Test results from Arena (CC BY 4.0). A model counts here when StepFun sells it, several hosts list it or a test covers it. Each figure is the source’s own; nothing is combined into a new score.