from openai import OpenAI
 
client = OpenAI(api_key="STEP_API_KEY", base_url="https://api.stepfun.ai/v1")
 
completion = client.chat.completions.create(
    model="step-3.5-flash",
    messages=[
        {
            "role": "system",
            "content": "You are an AI chat assistant provided by StepFun. You are good at Chinese, English, and many other languages. While keeping user data safe, you can respond quickly and accurately to users' questions and requests. Your answers and suggestions should reject content related to pornography, gambling, drugs, violence, or terrorism."
        },
        {"role": "user","content": "Hello, please introduce StepFun's artificial intelligence!"}
    ],
)
 
print(completion)

curl https://https://api.stepfun.ai/v1 \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $STEP_API_KEY" \
-d '{
    "model": "step-3.5-flash",
    "messages": [
        {
             "role": "system",
             "content": "You are an AI chat assistant provided by StepFun. You are good at Chinese, English, and many other languages. While keeping user data safe, you can respond quickly and accurately to users' questions and requests. Your answers and suggestions should reject content related to pornography, gambling, drugs, violence, or terrorism."
        },
        {
             "role": "user",
             "content": "Hello, please introduce StepFun's artificial intelligence!"
        }
    ]
}'

{
    "id": "b7b56af0-52a6-483f-a589-948182676a1",
    "object": "chat.completion",
    "created": 170989341,
    "model": "step-3.5-flash",
    "choices": [
        {
            "index": 0,
            "message": {
                "role": "assistant",
                "content": "Hello! StepFun is a company focused on artificial intelligence technology and is dedicated to developing and providing various AI solutions. Our AI capabilities cover natural language processing, computer vision, and machine learning to help users in many industries improve efficiency and create value.\n\nWe provide a variety of AI products and services, including intelligent customer service, virtual assistants, smart recommendations, and intelligent moderation. These products and services can be applied across industries such as finance, retail, education, and healthcare. By using our AI, users can better understand and analyze data, deliver personalized services and experiences, and improve the efficiency and accuracy of their decisions.\n\nWe value the security and privacy of user data and strictly follow relevant laws, regulations, and industry standards. We believe AI technology should create more benefits for people rather than negative impacts. We will continue to work hard to provide smarter, more efficient, and safer AI solutions."
            },
            "finish_reason": "stop"
        }
    ],
    "usage": {
        "prompt_tokens": 83,
        "completion_tokens": 176,
    "total_tokens": 259
    }
}

data: {"id":"...","object":"chat.completion.chunk","created":1772620766,"model":"step-3.5-flash","choices":
[{"index":0,"delta":{"role":"assistant","content":""}}]}
 
data: {"id":"...","object":"chat.completion.chunk","created":1772620766,"model":"step-3.5-flash","choices":
[{"index":0,"delta":{"content":"- Validate SSE headers: `Content-Type: text/event-stream`, `Cache-Control: no-cache`,
and persistent `Connection: keep-alive`.\n"}}]}
 
data: {"id":"...","object":"chat.completion.chunk","created":1772620766,"model":"step-3.5-flash","choices":
[{"index":0,"delta":{"content":"- Verify chunk framing with `data:` lines, double-newline delimiters, and proper UTF-8
decoding across partial frames.\n"}}]}
 
data: {"id":"...","object":"chat.completion.chunk","created":1772620766,"model":"step-3.5-flash","choices":
[{"index":0,"delta":{"content":"- Test reconnect logic with `retry` intervals and `Last-Event-ID` handling after
disconnects.\n"}}]}
 
data: {"id":"...","object":"chat.completion.chunk","created":1772620766,"model":"step-3.5-flash","choices":
[{"index":0,"delta":{"content":"- Confirm graceful handling of server/network/client interruptions.\n"}}]}
 
data: {"id":"...","object":"chat.completion.chunk","created":1772620766,"model":"step-3.5-flash","choices":
[{"index":0,"delta":{"content":"- Ensure ordered delivery with no duplicates during sustained
streaming."},"finish_reason":"stop"}]}