Step 5 Preview

step-5-preview · StepFun

Step 5 Preview is StepFun's next-generation flagship base model designed for real-world tasks, with a focus on programming and professional expertise.

API Pricing

Input$1.08 / 1M tokens
Output$3.0888 / 1M tokens
Cache read$0.054 / 1M tokens

Specifications

Context1M tokens
Modalitiestext, image, video
CapabilitiesThinking, Streaming, Tool calling, Structured outputs, Prompt caching

Frequently asked questions

What is Step 5 Preview?

Step 5 Preview is StepFun's next-generation flagship base model designed for real-world tasks, with a focus on programming and professional expertise.

What is the context length of Step 5 Preview?

Step 5 Preview has a 1,000,000 token context window.

How much does Step 5 Preview cost?

On AIHubMix, Step 5 Preview costs $1.08 per million input tokens and $3.0888 per million output tokens. Cached input reads are billed at $0.054 per million tokens.

What modalities does Step 5 Preview support?

Step 5 Preview accepts text, image and video input.

How do I call Step 5 Preview via API?

Step 5 Preview is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to step-5-preview — no other code changes needed.

Who created Step 5 Preview?

Step 5 Preview is developed by StepFun. AIHubMix aggregates it alongside models from other providers behind one API and one bill.

When was Step 5 Preview released?

Step 5 Preview was released on September 20, 2026 by StepFun.

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Use Step 5 Preview via the AIHubMix unified API — one interface for every major LLM.