Identity
- Type
- startup
- Country label
- China
- HQ country
- China
- Founding country
- China
- Parent
- not in the notes
- Parent country
- not in the notes
- Country basis
- the research notes
Where this comes from
Convention D1: a dual label, HQ first, when the HQ, founding or parent country differ.
Models by Class
Models
ModelClassOpennessParametersReleased
Step-3.7-Flashmultimodal LLM3 Jun 2026Step-3.5-FlashLLMMar 2026ACE-Step 1.5StepFun, ACE Studiomusic and audio31 Jan 2026Step-Audio-R1.1multimodal LLM14 Jan 2026Step3-VL-10Bmultimodal LLM13 Jan 2026
Step1X-Editimage generation23 Apr 2025
Step-Video-T2Vvideo generation14 Feb 2025Step-Audiomultimodal LLM13 Feb 2025Step-Audio-Chatmultimodal LLM13 Feb 2025ACE-Step v1StepFun, ACE Studiomusic and audio–Step 5 PreviewLLM–Links
OrganisationStepFunstartup, China
StepFunstartup, ChinaModelsStep-3.7-FlashStepFun, multimodal LLMStep-3.5-FlashStepFun, LLMACE-Step 1.5StepFun, music and audioStep-Audio-R1.1StepFun, multimodal LLM+7 more
Step-3.7-FlashStepFun, multimodal LLMStep-3.5-FlashStepFun, LLMACE-Step 1.5StepFun, music and audioStep-Audio-R1.1StepFun, multimodal LLM+7 moreUse Casesnone recorded
Who Runs Itnone recorded
Models 11
Step-3.7-FlashStepFun, multimodal LLMDeveloperACE-Step 1.5StepFun, ACE Studio, music and audioDeveloperACE-Step v1StepFun, ACE Studio, music and audioDeveloperStep-AudioStepFun, multimodal LLMDeveloperStep-3.5-FlashStepFun, LLMDeveloperStep-Audio-ChatStepFun, multimodal LLMDeveloperStep-Audio-R1.1StepFun, multimodal LLMDeveloperStep 5 PreviewStepFun, LLMDeveloperStep-Video-T2VStepFun, video generationDeveloperStep1X-EditStepFun, image generationDeveloperStep3-VL-10BStepFun, multimodal LLMDeveloperScores
| Benchmark | Model | Score | Who ran it | Setting |
|---|---|---|---|---|
| Arena Text leaderboard | Step 5 Preview | rank only | independent | |
| Artificial Analysis Intelligence Index | Step 5 Preview | 44 index | independent | |
| Humanity's Last Exam (HLE) | Step-3.7-Flash | 48.1 % | vendor-reported | with tools |
| SWE-bench Pro | Step-3.7-Flash | 56.3 % | vendor-reported |
Where this comes from
Every recorded score of this organisation's models, with who ran it. Scores from different settings are not directly comparable.
Sources
- LLM Leaderboard - Comparison of AI models from OpenAI, Anthropic, Google, SpaceXAI & others | Artificial Analysis artificialanalysis.ai https://artificialanalysis.ai/leaderboards/models
- huggingface.co/stepfun-ai/Step-3.7-Flash https://huggingface.co/stepfun-ai/Step-3.7-Flash
- ACE-Step: Open Source Music Generation Models by StepFun | ComfyUI Wiki comfyui-wiki.com https://comfyui-wiki.com/en/models/ace-step
- thestandard.com.hk/finance/article/331515/Stepfun-Chinas-AI-Six-... https://www.thestandard.com.hk/finance/article/331515/Stepfun-Chinas-AI-Six-Tigers-finishes-new-US25b-funding-round-for-HK-IPO
To cite this page: Project AURION, AI Use-Cases Research & Innovation, "StepFun", https://aurion.semai.id/organisations/stepfun/, records of October 2026.