step-5-preview

This page lists parameters from the ModelFold model catalog.

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...

Overview

Field	Value
Model ID	step-5-preview
Family slug	step-5-preview
Modality	Chat Models (chat)
Endpoint	POST /v1/chat/completions

Request example

export API_BASE="https://modelfold.ai/v1"
export MODELFOLD_API_KEY="mf-..."   # 在控制台 API Key 页面创建
curl -X POST "$API_BASE/chat/completions" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"step-5-preview","messages":[{"role":"user","content":"Explain what a diffusion model does in two sentences."}],"max_tokens":512}'

Related models

• Model overview
• See all 97 chat models models
• beam-1-0-501b-a23b
• claude-fable-5
• claude-fable-5-1
• claude-fable-5-2
• claude-haiku-4-5
• claude-haiku-5-5

See also

• API reference