Step 5 Preview

proprietary

Step 5 Preview is StepFun's flagship model for coding, software engineering, and professional knowledge work.

Context
1M
Max output
64K
Input price
$1/1M tokens
Output price
$2.7/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming

Details

Model IDstepfun/step-5-preview
Provider Novita AI
Creator StepFun
Family—
Licenseproprietary
Statusactive
Typechat
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1M tokens
Max input—
Max output64K tokens
Reasoning tokens—
Knowledge cutoff—
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Endpoints

Chat CompletionsPOST
Generate chat responses with messageshttps://api.novita.ai/v3/openai/v1/chat/completions

Pricing

Input
$1
Output
$2.7
Cache write
—
Cache read
—
Batch in
—
Batch out
—

API

GET/v1/models/novita/stepfun/step-5-preview

Step 5 Preview

stepfun/step-5-preview

Step 5 Preview is StepFun's flagship model for coding, software engineering, and professional knowledge work.

Changes · 2 entries
stepfun/step-5-previewcreateca7a400Nov 2, 2026, 03:02 AM
stepfun/step-5-previewcreate0d5a9a1Oct 14, 2026, 06:38 AM