Step 5 Preview

StepFun·China·Released 2026-09-16

Open weightsPreviewGeneral LLMReasoningTool useVision

StepFun's Step 5 Preview is a closed-source large language model focused on delivering high-quality conversation experiences.

1Mcontext

$1.05 / $2.99per 1M tokens (in / out)

604Bparameters

34stories in our feed

Specs

hover a value to see its source

Context window1M

Max output64K

Parameters604B

Knowledge cutoff—

Licenceother

Commercial useRestricted

InputText · Image · Video

OutputText

HF downloads (30d)2.1K

Familystep

API price

USD per 1M tokens

Input$1.05

Output$2.99

Cached input$0.105

Change history

2026-10-22Price $0.959/$2.74 → $1.05/$2.99models.dev

News timeline

from the AITOP feed, one story per eventAll 34 →

2026-10-21

Claude Fable 5.1 等 4 个模型在 3D 场景中自发生成圣家族大教堂魔方Artificial Analysis

Together AI 联合 StepFun 在旧金山举办 Step 5 预览发布夜Together AI

2026-10-17

Arena Alignment Index adds Meta Muse Wonder, Reflection Beam 1.0, Step 5 Previewlmarena.ai

2026-10-15

StepFun releases Step 5 Preview, a 600B open-weights MoE modelNVIDIA AI

StepFun 开源 Step 5 Preview：600B 稀疏 MoE，权重已上线 Hugging Face阶跃星辰 Stepfun

StepFun 开放 Step 5 Preview 权重：600B 总参数、27B 激活、1M 上下文pandaily

Step 5 Preview 发布当天即获 vLLM 支持vLLM

阶跃 Step 5 Preview 开放权重：600B 稀疏 MoE，支持 100 万 token 上下文IT之家

2026-10-09

Step 5 Preview from StepFun Tops OpenRouter Trendingelvis

2026-09-23

Claude Opus 5.5、GPT-6 Sol/Luna 同日发布，Mimo v2.6、Grok 4.7 齐上阵shao__meng

2026-09-20

StepFun 发布最新模型 Step 5 Preview，同步推出免费体验计划shao__meng

StepFun launches Step 5 preview: 600B sparse MoE, 1M contextpandaily

阶跃发布新版本，国产大模型再入主流爱范儿

Step 5 Preview model released by StepIT之家