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3 models
StepFun: Step 3.5 Flash
Temporarily unavailablestepfun/step-3.5-flash
$0.100/M input
$0.300/M output
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....
StepFun: Step 3.7 Flash
Temporarily unavailablestepfun/step-3.7-flash
$0.200/M input
$1.15/M output
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...
StepFun: Step 5 Preview
Temporarily unavailablestepfun/step-5-preview
$1.00/M input
$2.70/M output
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...
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