MODEL DIRECTORY
StepFun (China) Model Directory
StepFun builds the Step family of multimodal models.
Website · CNPublic models
4
With relay prices
2
Relay sites
7
Reasoning
4
Tool call
4
Structured output
0
Multimodal input
2
Text models
4
Image models
0
Video models
0
Audio models
0
Release range
2026-01-29 ~ 2026-09-16
4 models foundPrices in USD per 1M tokens; relay prices and ≈ are converted from CNY at today's rate
| Model | Provider | Type | Relays | Context | Max output | Input | Output | Capabilities | Price (input / output) | Details | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Step 5 Previewstep-5-preview | StepFun (China) | Text | 5 sites | 1M | 1M | Text: SupportedImage: SupportedVideo: SupportedFile: Supported | Text: Supported | Reason: SupportedTools: SupportedJSON: UnknownTemperature: SupportedOpen weights: Supported | 43.7 | Official$1 / $2.7Lowest$0.0733 / $0.2093 | 2026-09-16 | |
Step 5 Preview is StepFun's next flagship base model for real tasks, and it is listed on Step Plan. It accepts text, image, and video input, with a 1M token context window (verified 2026-10-20). Basics
Limits
InputText: SupportedImage: SupportedAudio: Not supportedVideo: SupportedPDF: Not supportedFile: Supported OutputText: SupportedImage: Not supportedAudio: Not supportedVideo: Not supported API capabilitiesReasoning: SupportedTool call: SupportedStructured output: UnknownTemperature: Supported Pricing
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Step 3.7 Flashstep-3.7-flash | StepFun (China) | Text | 3 sites | 256K | 256K | Text: SupportedImage: SupportedVideo: SupportedFile: Supported | Text: Supported | Reason: SupportedTools: SupportedJSON: UnknownTemperature: SupportedOpen weights: Supported | 19.5 | Official$0.2 / $1.15Lowest$9.31 / $9.31 | 2026-05-29 | |
Newer StepFun flash model for faster agents, coding, and multimodal prompts Basics
Limits
InputText: SupportedImage: SupportedAudio: Not supportedVideo: SupportedPDF: Not supportedFile: Supported OutputText: SupportedImage: Not supportedAudio: Not supportedVideo: Not supported API capabilitiesReasoning: SupportedTool call: SupportedStructured output: UnknownTemperature: Supported Pricing
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Step 3.5 Flash 2603step-3.5-flash-2603 | StepFun (China) | Text | - | 256K | 256K | Text: Supported | Text: Supported | Reason: SupportedTools: SupportedJSON: UnknownTemperature: SupportedOpen weights: Supported | - | Official$0.1 / $0.3LowestNo price | 2026-04-02 | |
StepFun flash model for efficient multimodal reasoning, coding, and tool use Basics
Limits
InputText: SupportedImage: Not supportedAudio: Not supportedVideo: Not supportedPDF: Not supportedFile: Not supported OutputText: SupportedImage: Not supportedAudio: Not supportedVideo: Not supported API capabilitiesReasoning: SupportedTool call: SupportedStructured output: UnknownTemperature: Supported Pricing
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Step 3.5 Flashstep-3.5-flash | StepFun (China) | Text | - | 256K | 256K | Text: Supported | Text: Supported | Reason: SupportedTools: SupportedJSON: UnknownTemperature: SupportedOpen weights: Supported | 17.0 | Official$0.1 / $0.3LowestNo price | 2026-01-29 | |
StepFun flash lane for quick multimodal reasoning and coding assistance Basics
Limits
InputText: SupportedImage: Not supportedAudio: Not supportedVideo: Not supportedPDF: Not supportedFile: Not supported OutputText: SupportedImage: Not supportedAudio: Not supportedVideo: Not supported API capabilitiesReasoning: SupportedTool call: SupportedStructured output: UnknownTemperature: Supported Pricing
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Capabilities and limits come from public sources. “Unknown” means no reliable data yet, not “not supported”. Relay counts include only sites with a current public price, de-duplicated per site.
Data source: models.dev · OpenRouter
Intelligence scores come from the OpenRouter benchmark rankings (Intelligence Index); higher is smarter.