Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
Specs
stepfun/step-3.7-flashHow to use Step 3.7 Flash in your app
The quickest way is through an API gateway such as OpenRouter, which uses the same format as the OpenAI API. Create a key, then send a request with the model ID stepfun/step-3.7-flash:
Prefer no code? Many tools in our AI tools directory run on models like this one.
More models from StepFun
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
Questions about Step 3.7 Flash
What is Step 3.7 Flash?
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B parameters...
How big is the context window of Step 3.7 Flash?
Step 3.7 Flash can read up to 262,144 tokens in one request, roughly 196,608 words.
How much does Step 3.7 Flash cost?
Through OpenRouter, Step 3.7 Flash costs about $0.20 / 1M tokens for input and $1.15 / 1M tokens for output. Prices change, so check before large jobs.
Is Step 3.7 Flash open source?
Step 3.7 Flash has open weights, so you can download and run it yourself, subject to its licence.
What can Step 3.7 Flash take as input?
Step 3.7 Flash accepts text, image, video and produces text.
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Specs and prices come from OpenRouter and the provider, and are refreshed daily. Last checked 28 May 2026.