ChatCompletions Format

Creates a model response based on conversation history. Supports streaming and non-streaming responses.

Compatible with OpenAI Chat Completions API.

Try It

POST/v1/chat/completionshttps://api-platform.ope.ai

Authentication

Uses Bearer Token authentication.

• Header: Authorization: Bearer <token>
• Example: Authorization: Bearer sk-xxxxxx

Request body (application/json)

The following fields are referenced for compatibility with OpenAI Chat Completions API; you can adjust based on OPEAI Platform's actual support scope.

Field	Type	Required	Description	Default / Range
model	string	Yes	Model ID	-
messages	array<object>	Yes	Conversation message list	-
temperature	number	No	Sampling temperature	Default 1; Range 0~2
top_p	number	No	Nucleus sampling parameter	Default 1; Range 0~1
n	integer	No	Number of completions to generate	Default 1; Range >=1
stream	boolean	No	Whether to stream responses	Default false
stream_options	object	No	Streaming parameters	-
stop	string | array<string>	No	Stop sequences	-
max_tokens	integer	No	Maximum number of tokens to generate	-
max_completion_tokens	integer	No	Maximum completion tokens	-
presence_penalty	number	No	Presence penalty	Default 0; Range -2~2
frequency_penalty	number	No	Frequency penalty	Default 0; Range -2~2
logit_bias	object	No	Logit bias	-
user	string	No	End-user identifier	-
tools	array<object>	No	Tools list	-
tool_choice	string | object	No	Tool choice strategy	-
response_format	object	No	Response format	-
seed	integer	No	Random seed	-
reasoning_effort	"low" | "medium" | "high"	No	Reasoning effort (for models that support reasoning)	-
modalities	array<string>	No	Output modalities	-
audio	object	No	Audio output configuration	-

Request examples

The domain below is an example: https://api-platform.ope.ai.

cURL

curl -X POST "https://api-platform.ope.ai/v1/chat/completions" \
  -H "Authorization: Bearer $OPEAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "DeepSeek-V3.2",
    "messages": [
      {
        "role": "user",
        "content": "hello"
      }
    ]
  }'

JavaScript

const url = "https://api-platform.ope.ai/v1/chat/completions";
const apiKey = process.env.OPEAI_API_KEY;

const res = await fetch(url, {
  method: "POST",
  headers: {
    Authorization: `Bearer ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    model: "DeepSeek-V3.2",
    messages: [{ role: "user", content: "hello" }],
  }),
});

console.log(await res.json());

Go

package main

import (
  "bytes"
  "fmt"
  "net/http"
  "os"
)

func main() {
  body := []byte(`{"model":"DeepSeek-V3.2","messages":[{"role":"user","content":"hello"}]}`)
  req, _ := http.NewRequest("POST", "https://api-platform.ope.ai/v1/chat/completions", bytes.NewBuffer(body))
  req.Header.Set("Authorization", "Bearer "+os.Getenv("OPEAI_API_KEY"))
  req.Header.Set("Content-Type", "application/json")

  resp, err := http.DefaultClient.Do(req)
  if err != nil {
    panic(err)
  }
  defer resp.Body.Close()
  fmt.Println(resp.Status)
}

Python

import os
import requests

resp = requests.post(
  "https://api-platform.ope.ai/v1/chat/completions",
  headers={
    "Authorization": f"Bearer {os.environ.get('OPEAI_API_KEY')}",
    "Content-Type": "application/json",
  },
  json={
    "model": "DeepSeek-V3.2",
    "messages": [{"role": "user", "content": "hello"}],
  },
  timeout=60,
)

print(resp.json())

Java

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
  public static void main(String[] args) throws Exception {
    String apiKey = System.getenv("OPEAI_API_KEY");
    String url = "https://api-platform.ope.ai/v1/chat/completions";

    String json = """
      {
        "model": "DeepSeek-V3.2",
        "messages": [
          { "role": "user", "content": "hello" }
        ]
      }
      """;

    HttpRequest request = HttpRequest.newBuilder()
      .uri(URI.create(url))
      .header("Authorization", "Bearer " + apiKey)
      .header("Content-Type", "application/json")
      .POST(HttpRequest.BodyPublishers.ofString(json))
      .build();

    HttpClient client = HttpClient.newHttpClient();
    HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
    System.out.println(response.statusCode());
    System.out.println(response.body());
  }
}

C#

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

public class Program
{
  public static async Task Main()
  {
    var apiKey = Environment.GetEnvironmentVariable("OPEAI_API_KEY");
    var url = "https://api-platform.ope.ai/v1/chat/completions";

    var json = """
    {
      "model": "DeepSeek-V3.2",
      "messages": [
        { "role": "user", "content": "hello" }
      ]
    }
    """;

    using var http = new HttpClient();
    http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
    var content = new StringContent(json, Encoding.UTF8, "application/json");

    var resp = await http.PostAsync(url, content);
    Console.WriteLine((int)resp.StatusCode);
    Console.WriteLine(await resp.Content.ReadAsStringAsync());
  }
}

Response examples

200

{
  "id": "string",
  "object": "chat.completion",
  "created": 0,
  "model": "string",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "system",
        "content": "string",
        "name": "string",
        "tool_calls": [
          {
            "id": "string",
            "type": "function",
            "function": { "name": "string", "arguments": "string" }
          }
        ],
        "tool_call_id": "string",
        "reasoning_content": "string"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 0,
    "completion_tokens": 0,
    "total_tokens": 0,
    "prompt_tokens_details": {
      "cached_tokens": 0,
      "text_tokens": 0,
      "audio_tokens": 0,
      "image_tokens": 0
    },
    "completion_tokens_details": {
      "text_tokens": 0,
      "audio_tokens": 0,
      "reasoning_tokens": 0
    }
  },
  "system_fingerprint": "string"
}

400

{
  "error": { "message": "string", "type": "string", "param": "string", "code": "string" }
}

429

{
  "error": { "message": "string", "type": "string", "param": "string", "code": "string" }
}