Provider

StepFun

StepFun is best evaluated through its Step models, multimodal reasoning models from one of China's leading AI labs.

summary

StepFun is an AI company based in Shanghai, China, founded in April 2023 by former Microsoft researchers. It develops general-purpose foundation models with a focus on multimodality across text, images and audio. On Eden AI, StepFun offers Step 3.5 Flash, a fast reasoning model with tool calling and a 262K context window; Step 3.7 Flash, which adds image input; and Step 5 Preview, with reasoning, tool calling, image input and a context window of about one million tokens. These models are a good fit for agentic and multimodal applications that need long context at a competitive price.

What is StepFun?

StepFun (阶跃星辰) is an artificial intelligence company headquartered in Shanghai, China. It was founded in April 2023 by former Microsoft employees and is often counted among China's leading AI labs. StepFun develops general-purpose foundation models and puts a strong emphasis on multimodal models that understand text, images and audio.

StepFun models available on Eden AI

Step 5 Preview: reasoning, function calling and image input, with a context window of about one million tokens.
Step 3.7 Flash: reasoning, function calling and image input, with a 262K context window.
Step 3.5 Flash: a fast sparse mixture-of-experts reasoning model with function calling and a 262K context window.

When to choose StepFun

You need reasoning and tool calling for agents at a competitive price.
You want image input together with long context.
You are comparing Chinese frontier models such as those from Moonshot AI, Z.ai and Qwen.

How to use StepFun with Eden AI

Call the Step models with the Eden AI chat completions API and your Eden AI API key. Each model page shows the providers, prices and context window, and lets you compare StepFun with similar models.

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