Step 5 Preview
NewStandardStepFun's flagship agentic model, a 600B-parameter MoE with 27B active.
1M-token context with text, image, and video input, always-on reasoning, and tool use. Strong at software engineering and professional document work; a preview release.
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Step 5 Preview is somewhat expensive at $1.00/M tokens input and $2.70/M tokens output. Cached input reads are priced at $0.05/M tokens, making repeated context cheaper. The model supports vision/image input, extended reasoning, a 1M context window.
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Nemotron 3 Ultravs Step 5 PreviewFrequently Asked Questions about Step 5 Preview▼
When was Step 5 Preview released?
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Step 5 Preview was released on October 8, 2026.
Who created Step 5 Preview?
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Step 5 Preview was created by StepFun.
How much does Step 5 Preview cost?
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Step 5 Preview costs $1.00/M input tokens and $2.70/M output tokens.
What is Step 5 Preview API pricing?
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The Step 5 Preview API is priced at $1.00 per million input tokens and $2.70 per million output tokens. You can access Step 5 Preview through idapt.app alongside 200+ other AI models in one workspace.
Is Step 5 Preview a reasoning model?
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Yes, Step 5 Preview is a reasoning model. It can think step-by-step through complex problems before providing an answer, often yielding better results on difficult tasks like math, coding, and multi-step logic.
Does Step 5 Preview support image or vision input?
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Yes, Step 5 Preview supports vision/image input. You can share images in your conversation and the model will analyze and respond based on their content.
Does Step 5 Preview support audio?
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No, Step 5 Preview does not support audio input.
What is the context window of Step 5 Preview?
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Step 5 Preview has a context window of 1M tokens, meaning it can process approximately 750,000 words of context at once.
Is Step 5 Preview open source?
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Step 5 Preview is a proprietary model developed by StepFun. The model weights and training data are not publicly available.
What is Step 5 Preview good at?
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Based on benchmark data, Step 5 Preview excels at: visual analysis and image understanding. It is StepFun's capable model suitable for a wide range of tasks.
Where can I use Step 5 Preview?
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You can chat with Step 5 Preview on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access Step 5 Preview through StepFun's own API or platform.