StepFun
StepFun 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). It performs strongly in software engineering and professional...
- Context window
- 1.0Mtokens
- Max output
- 64Ktokens
- Input
- $1.00/ 1M
- Output
- $2.70/ 1M
Quick start
from openai import OpenAI
client = OpenAI(
base_url="https://neurongate.net/v1",
api_key="sk-ng-your-api-key",
)
completion = client.chat.completions.create(
model="stepfun/step-5-preview",
messages=[{"role": "user", "content": "Hello!"}],
)
print(completion.choices[0].message.content)Cost
| Example request | Tokens | Cost |
|---|---|---|
| Short prompt | 1K in | $0.001 |
| Typical chat turn | 1K in · 500 out | $0.00235 |
| Document analysis | 10K in · 2K out | $0.0154 |
| Long context | 100K in · 10K out | $0.127 |
Prices in USD. Billed per token actually used, from a balance prepaid in USDT, USDC, ETH or BTC.
Frequently asked questions
What is StepFun 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). It performs strongly in software engineering and professional...
How much does StepFun Step 5 Preview cost?
StepFun Step 5 Preview is priced at $1 per 1 million input tokens and $2.7 per 1 million output tokens when accessed via NeuronGate. You pay per token — no subscriptions required. Top up with crypto (USDT, USDC, ETH, BTC).
Does StepFun Step 5 Preview support streaming?
Yes, StepFun Step 5 Preview supports streaming responses via NeuronGate's API. Use the standard "stream": true parameter in your request.
What is the context window of StepFun Step 5 Preview?
StepFun Step 5 Preview has a context window of 1.0M tokens (~786K words). Maximum output is 64K tokens.
Does StepFun Step 5 Preview support function calling (tools)?
Yes, StepFun Step 5 Preview supports function calling / tool use via NeuronGate's standard API.
How do I use StepFun Step 5 Preview with NeuronGate?
Create a NeuronGate account, top up your balance with crypto, generate an API key, and use the model id stepfun/step-5-preview in your requests. NeuronGate uses the OpenAI-compatible API format — set your base URL to https://neurongate.net/v1.