Step 5 Preview
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.
| Provider | Context | Limit | Card | |
|---|---|---|---|---|
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!"}]
}'from openai import OpenAI
client = OpenAI(
base_url="https://integrate.api.nvidia.com/v1",
api_key="YOUR_NVIDIA_API_KEY",
)
reply = client.chat.completions.create(
model="stepfun-ai/step-5-preview",
messages=[{"role": "user", "content": "Hello!"}],
)
print(reply.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://integrate.api.nvidia.com/v1",
apiKey: process.env.NVIDIA_API_KEY,
});
const reply = await client.chat.completions.create({
model: "stepfun-ai/step-5-preview",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(reply.choices[0].message.content);Example for NVIDIA Build. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.
Benchmarks
Source: Artificial Analysis · Step 5 Preview
Similar free models
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.