LLM Perks

Step 5 Preview

StepFun · All Step models
Free right now Small New
Long context

Step 5 Preview is a language model from StepFun. It is currently free at 1 provider with up to 1M tokens of context.

Developer
StepFun
Context
1M tokens
Type
Text
License
Proprietary
Free since
October 8, 2026

Where to use Step 5 Preview for free

Each row is a separate free endpoint with its own limits.

ProviderContextLimitCard
Nous Portal
stepfun/step-5-preview:free
1M The $0 Portal plan includes free models with standard rate limits. Model availability can change. No Open

Quick start

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

Example for Nous Portal. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.

Benchmarks

Intelligence Index
43.7
Humanity's Last Exam
46.5%
Long context (LCR)
88.3%

Source: Artificial Analysis · Step 5 Preview

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FAQ

Is Step 5 Preview free?

Yes. As of October 8, 2026, Step 5 Preview is free at Nous Portal. Each provider has its own limits — see the table above.

What is the context window of Step 5 Preview?

The largest context among free routes is 1,000,000 tokens. Some providers cap it lower.

How do I call Step 5 Preview via API?

Use any OpenAI-compatible client with base URL https://inference-api.nousresearch.com/v1, model ID stepfun/step-5-preview:free, and a Nous Portal key.

How good is Step 5 Preview?

Artificial Analysis Intelligence Index: 43.7. For comparison, the strongest free model in the catalog right now is GLM 5.3.

Is Step 5 Preview open-weight?

No, it is proprietary: access is only through provider APIs.