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StepFun (China)

4 Canonical Models

StepFun (China) foundation models, inference API endpoints, and pricing.

Official Provider Docs
Endpoint: https://api.stepfun.com/v1•Package: @ai-sdk/openai-compatible•Env Key: STEPFUN_API_KEY

Models by StepFun (China)

Specifications, context windows, and pricing for StepFun (China) models

4 models
Step 5 Preview
stepfun/step-5-preview•StepFun (China)
1M ctx

StepFun's next-generation flagship base model for coding and professional knowledge work, with native text, image, and video input and a 1M-token context window

1M out maxVision
In: $1.05 • Out: $2.99
StepFun (China)
Step 3.5 Flash
stepfun/step-3.5-flash•StepFun (China)
256K ctx

StepFun flash lane for quick multimodal reasoning and coding assistance

256K out maxArtificial Analysis Coding Index: 31.6 index
In: $0.10 • Out: $0.31
StepFun (China)
Step 3.5 Flash 2603
stepfun/step-3.5-flash-2603•StepFun (China)
256K ctx

StepFun flash model for efficient multimodal reasoning, coding, and tool use

256K out maxArtificial Analysis Coding Index: 34.6 index
In: $0.10 • Out: $0.31
StepFun (China)
Step 3.7 Flash
stepfun/step-3.7-flash•StepFun (China)
256K ctx

Newer StepFun flash model for faster agents, coding, and multimodal prompts

256K out maxVisionSWE-Bench Pro: 56.3 resolve rate
In: $0.20 • Out: $1.21
StepFun (China)