LLM Perks

Step 5 Preview

StepFun · All Step models
Free right now Frontier
Tool useLong context

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

Developer
StepFun
Context
1M tokens
Type
Text
License
Proprietary
Free since
October 15, 2026

Where to use Step 5 Preview for free

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

ProviderContextLimitCard
NVIDIA Build
stepfun-ai/step-5-preview
— Free serverless inference for development; limits and model availability may change. No Open

Quick start

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

Example for NVIDIA Build. 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 November 2, 2026, Step 5 Preview is free at NVIDIA Build. 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://integrate.api.nvidia.com/v1, model ID stepfun-ai/step-5-preview, and a NVIDIA Build 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 Flash.

Is Step 5 Preview open-weight?

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