Question 1

What is Step 5 Preview?

Accepted Answer

Step 5 Preview is a model from StepFun, released on Sep 15, 2026. Step 5 Preview is available on the Respan AI Gateway for production LLM workloads. Supports tool use. Up to 1.0M context window.

Question 2

How much does Step 5 Preview cost?

Accepted Answer

On the Respan gateway, input starts at $1.00 per 1M tokens on EmpirioLabs, and output starts at $2.70 per 1M tokens on EmpirioLabs, after gateway discounts.

Question 3

Which providers serve Step 5 Preview on Respan?

Accepted Answer

Step 5 Preview is served by EmpirioLabs.

Question 4

What is Step 5 Preview's context window?

Accepted Answer

Step 5 Preview accepts up to 1.0M tokens of context.

Question 5

How do I use Step 5 Preview with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "step-5-preview". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

Where does Step 5 Preview rank on the Respan Index?

Accepted Answer

Step 5 Preview scores 54.9 out of 100 on the Respan Index v1.1, ranking #12 of 138 models. By category: Coding 45.6, Agents 60.7, Reasoning 57.8 (estimated), Knowledge & language 57.3 (estimated), and Human preference 54.3. The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

Question 7

How does Step 5 Preview score on benchmarks?

Accepted Answer

Step 5 Preview has 5 published benchmark scores, including Terminal-Bench 4.0 31.8% and LMArena WebDev 1570. Each score links to where it was published; the data is collected by llmmetric.com.

Step 5 Preview

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Pricing

Cost by volume

Benchmarks

Certified where it counts.

Respan Indexv1.1

Coding1

Arena4

Apps

Step 5 Preview FAQ

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