StepFun
AI platform offering multimodal models, image generation, knowledge base Q&A, and agent studio for building AI applications.
At a Glance
Pricing
Free trial access to Step-3.5-Flash on OpenRouter
Engagement
Available On
About StepFun
StepFun is an AI platform that provides access to advanced multimodal models, image generation capabilities, and tools for building AI agents. The platform offers a comprehensive suite of AI services including conversational AI, visual reasoning, and knowledge base question-answering systems. Users can access these capabilities through both a web interface and an API platform.
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Multimodal Reasoning Models - Step-R1-V-mini supports image and text input with text output, enabling high-precision visual perception and complex reasoning tasks.
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Step 3o Vision - Specialized model proficient in image editing and visual understanding tasks.
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Image Creation - Generate images by describing what you want to create using natural language prompts.
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Knowledge Base Q&A - Focus on knowledge base question-answering for enterprise and research applications.
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Diligence Check - Cross-source verification using a multi-agent system for fact-checking and validation.
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Agent Studio - Build and deploy custom AI agents with the integrated development environment.
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Step Audio Studio - Audio processing and generation capabilities for multimedia applications.
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API Platform - Access StepFun's models programmatically through their API for integration into custom applications.
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Deep Research Beta - Advanced research capabilities currently in beta testing for in-depth analysis tasks.
To get started, visit the StepFun website and log in using Google or Discord authentication. From there, you can access the various AI tools directly through the web interface or obtain API credentials from the API Platform section for programmatic access.

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Pricing
Free Plan Available
Free trial access to Step-3.5-Flash on OpenRouter
- Step-3.5-Flash model access
- Basic API access
Capabilities
Key Features
- Multimodal reasoning models
- Image generation
- Knowledge base Q&A
- Agent Studio for building AI agents
- Step 3o Vision for image editing
- Diligence Check multi-agent verification
- Step Audio Studio
- Deep Research beta
- API access