BuildLearnCommunity ModelsCheapestLong-contextOpen sourceImage modelsTrending How we score API key
🎯 Don't want to pick? Send model: "appmo/auto" and Appmo routes each request to the cheapest model that's good enough — cutting your bill up to 40%. See how →
Models › stepfun › StepFun: Step 5 Preview

StepFun: Step 5 Preview — pricing & benchmarks

By stepfun · Updated 2026-11-01 · Open weights · custom licenseReads imageslong-context / RAGreads images / documentsstep-by-step reasoningopen weights / self-hostable

StepFun: Step 5 Preview costs $1 per 1M input tokens and $2.7 per 1M output tokens, with a 1M context window. It is best suited for long-context / RAG, reads images / documents, step-by-step reasoning, open weights / self-hostable, and is available through one OpenAI-compatible Appmo API key.
$1Input / 1M
$2.7Output / 1M
1MContext
5.2KHF downloads (30d)
137HF likes
52Buzz (0-100)

What StepFun: Step 5 Preview is used for

StepFun: Step 5 Preview is best suited for long-context / RAG, reads images / documents, step-by-step reasoning, open weights / self-hostable. Access it through one Appmo API key alongside 444 other models — Appmo's optimizer can route to it automatically when it is the best value for a request. Weights: huggingface.co/stepfun-ai/Step-5-Preview.

What people are saying (last 30 days)

Not enough posts yet to judge community sentiment. 6 Hacker News stories (162 points) · 12 new GitHub repos mentioning it. How we measure this.

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"stepfun/step-5-preview","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does StepFun: Step 5 Preview cost?
StepFun: Step 5 Preview costs $1 per 1M input tokens and $2.7 per 1M output tokens ($1.425 blended), as of 2026-11-01. Prices are expected to fall as competition increases.

What is StepFun: Step 5 Preview best for?
StepFun: Step 5 Preview is best suited for long-context / RAG, reads images / documents, step-by-step reasoning, open weights / self-hostable.

How do I use StepFun: Step 5 Preview?
Send requests to Appmo's OpenAI-compatible endpoint with model id "stepfun/step-5-preview" and one API key — no separate provider account needed.

Is StepFun: Step 5 Preview open source?
Yes — its weights are public on Hugging Face (stepfun-ai/Step-5-Preview) under a custom license; check the license terms before commercial use.

Can StepFun: Step 5 Preview create images?
No. StepFun: Step 5 Preview can read and understand images, but it only writes text.