StepFun: Step 5 Preview
Analysis Summary
StepFun: Step 5 Preview comes from StepFun. Released in October 2026, it is one of the newest models we cover. We place it in the Professional tier, where it sits at #17 of 698 models overall. For raw reasoning ability it ranks #17 of 436, putting it in among the very best models we track for overall intelligence.
Its 1M-token context window is larger than 86% of the models we list, suiting long documents, large codebases, and retrieval-heavy workloads. Crucially for business adoption, StepFun: Step 5 Preview combines tool use, function calling, vision input, and step-by-step reasoning in a single model, letting teams consolidate several use cases instead of stitching together multiple services.
At $1.00 input and $2.70 output per 1M tokens, StepFun: Step 5 Preview is cost-efficient for everyday workloads so it scales comfortably across routine production traffic. StepFun: Step 5 Preview is a dependable pick for businesses that need strong, well-rounded performance without paying frontier prices.
The DFO score ranks models on the Artificial Analysis Intelligence Index and is refreshed as new models launch. The write-up and verdict are our own. Feedback?
DFO Verdict
StepFun: Step 5 Preview currently sits at #17 of 698 models on our board. We class it as a professional-tier model.
Benchmarks
Artificial Analysis data refreshed Oct 12, 2026. Arena ratings from the Oct 2, 2026 text leaderboard, with style control.
Artificial Analysis has not published coding or agentic results for StepFun: Step 5 Preview yet. Until it does, the model sits below tested models on the Coding and AI Agents lists.
This model was released recently. Benchmark figures are preliminary and are likely to be updated as independent testing is finalised.
How StepFun: Step 5 Preview compares
StepFun: Step 5 Preview ranks #17 of 436 AI models we track for overall intelligence. Its 1M-token context window is larger than 86% of the models we list. At $1.00 per million input tokens it is cheaper than 24% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.00 | $0.001000 |
| Output | $2.70 | $0.002700 |
What would StepFun: Step 5 Preview cost your business?
Pick the job that looks most like yours, then fine-tune with the sliders. Estimates update live.
A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 698 models → Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save StepFun: Step 5 Preview for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout StepFun: Step 5 Preview
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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Frequently asked questions about StepFun: Step 5 Preview
How much does StepFun: Step 5 Preview cost?
StepFun: Step 5 Preview costs $1.00 per million input tokens and $2.70 per million output tokens.
What is the context window of StepFun: Step 5 Preview?
StepFun: Step 5 Preview has a context window of 1,000,000 tokens (1M).
What can StepFun: Step 5 Preview do?
StepFun: Step 5 Preview supports image/vision input, tool use, and function calling.
Who created StepFun: Step 5 Preview?
StepFun: Step 5 Preview is developed by StepFun and was released on October 8, 2026.