Step 5 Preview

Benchmarks, price, context and versions

Also searched as

StepFun Step 5, step 5 preview reddit, step 5 preview ai, step 5 preview model

Direct answer: Step 5 Preview is a model from StepFun. On OpenRouter, US$ 1.00 per 1 million input tokens and US$ 2.70 per 1 million output tokens.

✓ Good for

very long documents or code (a window of 1 million tokens or more, according to OpenRouter)
running on your own infrastructure (open weights)

✕ Not the best for

Not enough data in the open sources this section uses to build this block.

This block follows a rule of this section, using source data: if the model is in the top 25% of the metric, the item goes under "Good for"; if it is in the bottom half, it goes under "Not the best for". The middle band appears in neither. Price and context use OpenRouter; scores use Epoch AI or OpenRouter Benchmarks, in the latest version we checked.

Benchmarks

no data

Key specs

Lab: StepFun
Origin: China
Family: Step provisional data
Weights?what it is: open
License: no data
Input US$/1M?: US$ 1.00
Output US$/1M: US$ 2.70
Context?: 1,000,000 tokens
Parameters: no data
Input: image, text, video
OpenRouter usage?: 3.25%
Downloads (30 days)?: no data
Use cases provisional data: Text Agents
Dates in sources: 2026, listed on OpenRouter

Version history

2026 StepFun: Step 5 Preview OpenRouter, listed on OpenRouter
2026 Step-5-Preview-BF16 Hugging Face Hub, Hugging Face repo created
2026 Step-5-Preview Hugging Face Hub, Hugging Face repo created
2026 StepFun: Step 3.7 Flash OpenRouter, listed on OpenRouter
2026 Step-3.7-Flash-FP8 Hugging Face Hub, Hugging Face repo created
2026 Step-3.7-Flash Hugging Face Hub, Hugging Face repo created
2026 Step-3.5-Flash-Base Hugging Face Hub, Hugging Face repo created
2026 Step-3.5-Flash-Base-Midtrain Hugging Face Hub, Hugging Face repo created
2026 NextStep-1.1-Pretrain-256px Hugging Face Hub, Hugging Face repo created
2026 Step3-VL-10B-FP8 Hugging Face Hub, Hugging Face repo created
2026 Step-3.5-Flash-FP8 Hugging Face Hub, Hugging Face repo created
2026 Step-3.5-Flash Hugging Face Hub, Hugging Face repo created
2026 StepFun: Step 3.5 Flash OpenRouter, listed on OpenRouter
2026 Step-Audio-R1.1 Hugging Face Hub, Hugging Face repo created

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch.

FAQ

Is Step 5 Preview open source?

Yes, it has open weights. License: no data.

Is Step 5 Preview good for coding?

No data: there is no SWE-bench Verified measurement for it in open sources.

What is Step 5 Preview?

Step 5 Preview is a model from StepFun, with open weights, used for text, agents.

How much does Step 5 Preview cost?

On OpenRouter, US$ 1.00 per 1 million input tokens and US$ 2.70 per 1 million output tokens.

What is the context window of Step 5 Preview?

1,000,000 tokens, per OpenRouter.

Who made Step 5 Preview?

It was made by StepFun, a lab from China.

provisional data Questions ordered by what shows up in public Google search suggestions (no volume). Answers use source data only.

Models from StepFun

See lab

Sources

OpenRouter, dados públicos da API; exports de benchmarks e rankings em CC BY 4.0, latest version we checked.

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch. Family and version were grouped by rule from the name.