StepFunAvailable

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).

Try in ewpirestepfun/step-5-preview

Opens in the ewpire workspace. Creating an account is free; runs are paid from your credits.

Step 5 Preview in plain words

Step 5 Preview is a text model from StepFun. It takes text, images, and video as input and returns text. Its context window is 1,048,576 tokens. It costs 1.241177 credits per 1M input tokens and 3.351177 credits per 1M output tokens.

It is good at reasoning through multi-step problems and calling tools. It reads images as well as text. A context window of 1,048,576 tokens holds about 4,200,000 characters of English text, at 4 characters a token.

For example, a question of 2,000 tokens (about 8,000 characters) with an answer of 1,000 tokens (about 4,000 characters) costs 0.005834 credits. The exact charge follows the usage the model reports for your request.

Details

Made by: StepFun
Good at: ReasoningVisionTool use
Reads: Text, Images, Video
Produces: Text
Context window: 1,048,576 tokens

Price

Input, per 1M tokens: 1.241177 credits
Output, per 1M tokens: 3.351177 credits

Charged per request from your credit balance. No subscription. See pricing

In the API – coming soon

API keys are not open yet. The docs show how to call this model with the OpenAI SDK or plain HTTP once they are. Read the docs

curl https://ewpire.com/api/v1/chat/completions \
  -H "Authorization: Bearer $EWPIRE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"stepfun/step-5-preview","messages":[{"role":"user","content":"Hello!"}]}'

The docs show how to list the models the API serves, with their capabilities and prices, once API keys are open. Models in the docs

Step 5 Preview in plain words

Details

Price

In the API – coming soon

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