Step 5
language modelStepFun
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...
Key facts
| Made by | StepFun |
|---|---|
| Type | language model |
| Released | October 8, 2026 |
| Reads at once | 1,048,576 tokens |
| Price (API, per million tokens) | $1 in · $2.7 out |
| Input → output | text, image, video → text |
Questions about Step 5
Who makes Step 5?
Step 5 is made by StepFun.
When was Step 5 released?
We first saw Step 5 listed on October 8, 2026.
How much does Step 5 cost?
Through OpenRouter it costs $1 per million input tokens and $2.7 per million output tokens. Prices change, so check the provider before you build on it.
How much text can Step 5 read at once?
Up to 1,048,576 tokens, roughly 786.4K words.
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Modelcast collects this page automatically from public sources (OpenRouter). Facts are copied from those sources, not written by the maker. Not affiliated with StepFun.