创建Chat Completion

创建AI聊天对话，并获取模型生成的聊天响应数据

请求地址

POST https://api.stepfun.com/v1/chat/completions

请求参数

model string required
需要使用的模型名称
messages object array required
迄今为止用户输入或模型生成的不同类别消息列表
展开/收起
- 系统消息 object
  展开/收起
  
  role string
  
  系统类别名称，总是为system
  
  content string
  
  系统消息的文本内容
- 用户消息 object
展开/收起
role string
用户类别名称，总是user

content string or object array
用户消息内容，类型为multipart消息列表或者普通文本消息字符串

展开/收起

普通文本消息 string

multipart消息列表 object array
结构化的图、视频、音频、文字混合消息

展开/收起

文本消息 object

展开/收起

type string
总为text

text string
消息文本内容

图片消息 object

展开/收起

type string
总为image_url

image_url object

展开/收起

url string
图片地址或base64编码的图片，图片格式：jpg/jpeg、png、webp、静态gif，仅支持http和https协议。
base64格式举例：data:image/jpeg;base64,${base64_string}，请更换图片格式(jpeg)及对应的base64编码后字符串

detail string optional
是否开启detail模式：low/high可选，默认为low模式

low模式下，图片会被缩放到固定尺寸，token数量固定在400左右
high模式下，模型会提供更详细、更丰富的信息，在大图、OCR、极端长宽比的场景会有比较好的表现，token数会根据图片的实际情况而变化

视频消息 object

展开/收起

type string
总为video_url

video_url object

展开/收起

url string
视频的URL地址，视频格式：video/mp4，仅支持http和https协议，视频内容要小于128M，时长建议小于5分钟。

音频消息 object

展开/收起

type string
总为input_audio

input_audio object

展开/收起

data string
音频内容，为音频的base64编码。
base64格式举例：data:audio/mpeg;base64,${base64_string}，请更换音频格式(当前仅支持 mp3 和wav)及对应的base64编码后字符串
- 工具函数消息 object
展开/收起
role string
系统类别名称，总是为tool

content string
函数执行得到的内容

tool_call_id string
执行函数的ID，由assistant在上一轮对话中返回。
- 聊天助手消息 object
展开/收起
role string
聊天助手类别名称，总是为assistant

content string | null
聊天助手消息的文本内容
tools object array optional
Toolcall支持的函数列表
展开/收起
- type string
  工具类型，总是为function
- function object
  函数内容的描述
展开/收起
name string
函数名称，要求纯英文、数字和_-符号，建议不要超过64个字符长度。

description string
函数描述，支持中英文，它用于告诉模型函数实现何种功能和目的，方便模型来判断和选择。

parameters object
函数的参数

展开/收起

type object
参数描述，一般为object

properties object
函数参数内容，以key为参数的名称，然后通过type和description描述参数的类型和介绍。

展开/收起

type string|number|integer|object|array|boolean
参数类型，可以参考json-schema 介绍

description string
函数参数描述，支持中英文，它用于告诉模型函数参数的含义。
max_tokens int optional
聊天需要生成的标记最大数量，默认值为INF（不作限制，由模型自动决定）。输入标记和生成标记的总数量受限于指定模型的最大上下文长度。
temperature float optional
采样温度，介于0.0和2.0之间的数字。较高值（如0.8）会使生成更随机，较低值（如0.2）会使其生成结果更集中且确定。默认值为0.5
top_p float optional
核心采样，该值会使模型生成具有top_p概率质量的标记并输出到结果。默认值为0.9
n int optional
控制模型为每个输入消息生成的响应消息结果条数，默认值为1，最大不限，建议不超过5。
stream bool optional
是否流式生成响应消息，默认值为false
stop string | string array optional
用于指导模型生成聊天响应过程中，是否遇到stop中的内容，进行生成中断，默认为空
frequency_penalty float optional
默认为0。介于0.0和1.0之间的数字。值较高会使模型生成某token时，根据其过往在生成文本中出现的频度，进行后续降频惩罚，从而降低模型重复生成相同内容的可能性
response_format object optional
用于指导模型输出特定格式的内容。默认为 {"type":"text"}，表示输出文本。设置为 { "type": "json_object" } 可以开启 JSON Mode，输出可解析的 JSON 结构。
reasoning_format object optional
用于指导模型输出时使用的 reasoning 字段；默认为 general，表示通用推理，使用 reasoning 字段返回结果；可选项为 [general,deepseek-style]。当设置为 deepseek-style 时，可使用 DeepSeek 兼容的的 reasoning_content 字段获取到 reasoning 内容。

请求响应

返回Chat Completion响应对象，或者Chat Completion流式响应对象块

示例


from openai import OpenAI
 
client = OpenAI(api_key = "STEP_API_KEY", base_url = "https://api.stepfun.com/v1")
 
completion = client.chat.completions.create(
    model = "step-1-8k",
    messages = [
    {
        "role": "system",
        "content": "你是由阶跃星辰提供的AI聊天助手，你擅长中文，英文，以及多种其他语言的对话。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容",
    },
    {
        "role": "user",
        "content": "你好，请介绍一下阶跃星辰的人工智能!"
    }, ],
)
 
print(completion)


import OpenAI from "openai";
 
const openai = new OpenAI({
    apiKey: "STEP_API_KEY",
    baseURL: "https://api.stepfun.com/v1"
});
 
async function main() {
    const completion = await openai.chat.completions.create({
        model: "step-1-8k",
        messages: [{
                "role": "system",
                "content": "你是由阶跃星辰提供的AI聊天助手，你擅长中文，英文，以及多种其他语言的对话。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容"
            },
            {
                "role": "user",
                "content": "你好，请介绍一下阶跃星辰的人工智能!"
            }
        ]
    });
 
    console.log(JSON.stringify(completion));
}
 
main();


curl https://api.stepfun.com/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $STEP_API_KEY" \
-d '{
"model": "step-1-8k",
"messages": [
    {
        "role": "system",
        "content": "你是由阶跃星辰提供的AI聊天助手，你擅长中文，英文，以及多种其他语言的对话。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容。"
    },
    {
        "role": "user",
        "content": "你好，请介绍一下阶跃星辰的人工智能！"
    }
]
}'


{
    "id": "b7b56af0-52a6-483f-a589-948182676a1b",
    "object": "chat.completion",
    "created": 1709893411,
    "model": "step-1-8k",
    "choices": [
        {
            "index": 0,
            "message": {
                "role": "assistant",
                "content": "你好！阶跃星辰是一家专注于人工智能技术的公司，致力于开发和提供各种AI解决方案。我们的人工智能技术涵盖了自然语言处理、计算机视觉、机器学习等领域，旨在帮助用户在各个行业和领域中提高效率和创造价值。\n\n我们提供多种AI产品和服务，包括智能客服、虚拟助手、智能推荐、智能审核等。这些产品和服务可以应用于多个行业，如金融、零售、教育、医疗等。通过使用我们的AI技术，用户可以更好地理解和分析数据，提供个性化的服务和体验，提高决策效率和准确性。\n\n我们注重用户数据的安全和隐私保护，严格遵守相关法律法规和行业标准。我们相信，人工智能技术应该为人类创造更多的福祉，而不是带来负面的影响。我们将继续努力，为用户提供更加智能、高效、安全的AI解决方案。"
            },
            "finish_reason": "stop"
        }
    ],
    "usage": {
        "prompt_tokens": 83,
        "completion_tokens": 176,
        "total_tokens": 259
    }
}


from openai import OpenAI
 
client = OpenAI(api_key="STEP_API_KEY", base_url="https://api.stepfun.com/v1")
 
completion = client.chat.completions.create(
model="step-1v-8k",
messages=[
{
"role": "system",
"content": "你是由阶跃星辰提供的AI聊天助手，你除了擅长中文，英文，以及多种其他语言的对话以外，还能够根据用户提供的图片，对内容进行精准的内容文本描述。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容",
},
{
"role": "user",
"content": [
{
"type": "text",
"text": "用优雅的语言描述这张图片",
},
{
"type": "image_url",
"image_url": {
"url": "https://www.stepfun.com/assets/section-1-CTe4nZiO.webp"
},
},
],
},
],
)
 
print(completion)


import OpenAI from "openai";
 
const openai = new OpenAI({
    apiKey: "STEP_API_KEY",
    baseURL: "https://api.stepfun.com/v1"
});
 
async function main() {
    const completion = await openai.chat.completions.create({
        model: "step-1v-8k",
        messages: [{
                "role": "system",
                "content": "你是由阶跃星辰提供的AI聊天助手，你除了擅长中文，英文，以及多种其他语言的对话以外，还能够根据用户提供的图片，对内容进行精准的内容文本描述。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容"
            },
            {
                "role": "user",
                "content": [{
                        "type": "text",
                        "text": "用优雅的语言描述这张图片"
                    },
                    {
                        "type": "image_url",
                        "image_url": {
                            "url": "https://www.stepfun.com/assets/section-1-CTe4nZiO.webp"
                        }
                    }
                ]
            }
        ]
    });
 
    console.log(JSON.stringify(completion));
}
 
main();


curl https://api.stepfun.com/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $STEP_API_KEY" \
-d '{
"model": "step-1v-8k",
"messages": [
    {
        "role": "system",
        "content": "你是由阶跃星辰提供的AI聊天助手，你除了擅长中文，英文，以及多种其他语言的对话以外，还能够根据用户提供的图片，对内容进行精准的内容文本描述。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容"
    },
    {
        "role": "user",
        "content": [
            {
                "type": "text",
                "text": "用优雅的语言描述这张图片"
            },
            {
                "type": "image_url",
                "image_url": {
                    "url": "https://www.stepfun.com/assets/section-1-CTe4nZiO.webp"
                }
            }
        ]
    }
]
}'


{
    "id": "298ad5e6-033a-41f8-9801-43be6e106f22",
    "object": "chat.completion",
    "created": 1710145618,
    "model": "step-1v-8k",
    "choices": [
        {
            "index": 0,
            "message": {
                "role": "assistant",
                "content": "在黄昏的柔和光线下，一座现代化的建筑映入眼帘，它拥有鲜明的红色外观，与周围环境形成鲜明对比。这座建筑的底层设有宽敞的玻璃窗，为室内提供了充足的自然光。建筑的一侧有醒目的标识，顶部的窗户排列整齐，展现了现代设计的风格。\n\n在建筑前的空地上，有一棵光秃的树，其枝条在微风中轻轻摇曳。树下是一片铺着碎石的土地，为这个空间增添了一丝自然的气息。在空地的一侧，还可以看到几个小巧的灯具，它们发出的温暖光线在傍晚显得格外温馨。\n\n建筑周围环境整洁，道路上没有车辆，显得非常宁静。远处可以看到其他建筑的轮廓，以及天空中即将落下的太阳，为这幅画面增添了丰富的层次感。整个场景透露出一种宁静而有序的都市生活氛围。"
            },
            "finish_reason": "stop"
        }
    ],
    "usage": {
        "prompt_tokens": 497,
        "completion_tokens": 169,
        "total_tokens": 666
    }
}


# -*- coding: utf8 -*-
 
import base64
import requests
from openai import OpenAI
 
client = OpenAI(api_key="STEP_API_KEY", base_url="https://api.stepfun.com/v1")
 
# 加载图片到内存，仅演示。按需改成读文件等
 
r = requests.get("https://www.stepfun.com/assets/section-1-CTe4nZiO.webp")
r.raise_for_status()
image_str = base64.b64encode(r.content).decode('ascii')
 
completion = client.chat.completions.create(
model="step-1v-8k",
messages=[
{
"role": "system",
"content": "你是由阶跃星辰提供的AI聊天助手，你除了擅长中文，英文，以及多种其他语言的对话以外，还能够根据用户提供的图片，对内容进行精准的内容文本描述。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容",
},
{
"role": "user",
"content": [
{
"type": "text",
"text": "用优雅的语言描述这张图片",
},
{
"type": "image_url",
"image_url": {
"url": "data:image/webp;base64,%s" % (image_str),
},
},
],
},
],
)
 
print(completion)


import OpenAI from "openai";
 
const openai = new OpenAI({
    apiKey: "STEP_API_KEY",
    baseURL: "https://api.stepfun.com/v1"
});
 
// 加载图片到内存，仅演示。按需改成读文件等
async function load_image(url) {
    let response = await fetch(url);
    let blob = await response.blob();
    let buffer = Buffer.from(await blob.arrayBuffer());
    return "data:" + blob.type + ';base64,' + buffer.toString('base64');
}
 
async function main() {
    const completion = await openai.chat.completions.create({
        model: "step-1v-8k",
        messages: [{
                "role": "system",
                "content": "你是由阶跃星辰提供的AI聊天助手，你除了擅长中文，英文，以及多种其他语言的对话以外，还能够根据用户提供的图片，对内容进行精准的内容文本描述。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容"
            },
            {
                "role": "user",
                "content": [{
                        "type": "text",
                        "text": "用优雅的语言描述这张图片",
                    },
                    {
                        "type": "image_url",
                        "image_url": {
                            "url": await load_image("https://www.stepfun.com/assets/section-1-CTe4nZiO.webp"),
                        }
                    }
                ]
            }
        ]
    });
 
    console.log(JSON.stringify(completion));
}
 
main();


# 加载图片到内存，仅演示。按需改成读文件等
image_base64="data:image/webp;base64,"$(curl -s "https://www.stepfun.com/assets/section-1-CTe4nZiO.webp" | base64)
 
curl https://api.stepfun.com/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $STEP_API_KEY" \
-d "{
\"model\": \"step-1v-8k\",
\"messages\": [
{
    \"role\": \"system\",
    \"content\": \"你是由阶跃星辰提供的AI聊天助手，你除了擅长中文，英文，以及多种其他语言的对话以外，还能够根据用户提供的图片，对内容进行精准的内容文本描述。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容\"
},
{
    \"role\": \"user\",
    \"content\": [
        {
            \"type\": \"text\",
            \"text\": \"用优雅的语言描述这张图片\"
        },
        {
            \"type\": \"image_url\",
            \"image_url\": {
                \"url\": \"${image_base64}\"
}
}
]
}
]
}"


{
    "id": "018ec23da38c7e2cbbe2f669c7b62483",
    "object": "chat.completion",
    "created": 1710145618,
    "model": "step-1v-8k",
    "choices": [
        {
            "index": 0,
            "message": {
                "role": "assistant",
                "content": "在黄昏的柔和光线下，一座现代化的建筑映入眼帘，它拥有鲜明的红色外观，与周围环境形成鲜明对比。这座建筑的底层设有宽敞的玻璃窗，为室内提供了充足的自然光。建筑的一侧有醒目的标识，顶部的窗户排列整齐，展现了现代设计的风格。\n\n在建筑前的空地上，有一棵光秃的树，其枝条在微风中轻轻摇曳。树下是一片铺着碎石的土地，为这个空间增添了一丝自然的气息。在空地的一侧，还可以看到几个小巧的灯具，它们发出的温暖光线在傍晚显得格外温馨。\n\n建筑周围环境整洁，道路上没有车辆，显得非常宁静。远处可以看到其他建筑的轮廓，以及天空中即将落下的太阳，为这幅画面增添了丰富的层次感。整个场景透露出一种宁静而有序的都市生活氛围。"
            },
            "finish_reason": "stop"
        }
    ],
    "usage": {
        "prompt_tokens": 497,
        "completion_tokens": 169,
        "total_tokens": 666
    }
}


from openai import OpenAI
 
client = OpenAI(api_key="STEP_API_KEY", base_url="https://api.stepfun.com/v1")
 
completion = client.chat.completions.create(
model="step-1-8k",
stream=True,
messages=[
{
"role": "system",
"content": "你是由阶跃星辰提供的AI聊天助手，你擅长中文，英文，以及多种其他语言的对话。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容",
},
{"role": "user", "content": "你好，请在64字数以内介绍一下阶跃星辰的人工智能!"},
],
)
 
for chunk in completion:
print(chunk)


import OpenAI from "openai";
 
const openai = new OpenAI({
    apiKey: "STEP_API_KEY",
    baseURL: "https://api.stepfun.com/v1",
});
 
async function main() {
    const completion = await openai.chat.completions.create({
        model: "step-1-8k",
        stream: true,
        messages: [{
                "role": "system",
                "content": "你是由阶跃星辰提供的AI聊天助手，你擅长中文，英文，以及多种其他语言的对话。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容"
            },
            {
                "role": "user",
                "content": "你好，请在64字数以内介绍一下阶跃星辰的人工智能!"
            }
        ]
    });
 
    for await (const chunk of completion) {
        console.log(JSON.stringify(chunk));
    }
}
 
main();


curl https://api.stepfun.com/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $STEP_API_KEY" \
-d '{
"model": "step-1-8k",
"stream": true,
"messages": [
    {
        "role": "system",
        "content": "你是由阶跃星辰提供的AI聊天助手，你擅长中文，英文，以及多种其他语言的对话。在保证用户数据安全的前提下，你能对用户的问题和请求，作出快速和精准的回答。同时，你的回答和建议应该拒绝黄赌毒，暴力恐怖主义的内容"
    },
    {
        "role": "user",
        "content": "你好，请在64字数以内介绍一下阶跃星辰的人工智能!"
    }
]
}'


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data: {"id":"d4ca43cd-83a7-4012-9ee7-b8f143eb1f8f","object":"chat.completion.chunk","created":1710146871,"model":"step-1-8k","choices":[{"index":0,"delta":{"role":"","content":"，"},"finish_reason":""}],"usage":{"prompt_tokens":90,"completion_tokens":11,"total_tokens":101}}
 
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data: {"id":"d4ca43cd-83a7-4012-9ee7-b8f143eb1f8f","object":"chat.completion.chunk","created":1710146871,"model":"step-1-8k","choices":[{"index":0,"delta":{"role":"","content":"不良"},"finish_reason":""}],"usage":{"prompt_tokens":90,"completion_tokens":16,"total_tokens":106}}
 
data: {"id":"d4ca43cd-83a7-4012-9ee7-b8f143eb1f8f","object":"chat.completion.chunk","created":1710146871,"model":"step-1-8k","choices":[{"index":0,"delta":{"role":"","content":"，"},"finish_reason":""}],"usage":{"prompt_tokens":90,"completion_tokens":17,"total_tokens":107}}
 
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data: [DONE]