Tạo một chat completion

{
  "model": "gpt-6-astra",
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "Describe the road and surrounding landscape in this image."
        },
        {
          "type": "image_url",
          "image_url": {
            "url": "https://images.unsplash.com/photo-1500530855697-b586d89ba3ee?w=1200",
            "detail": "high"
          }
        }
      ]
    }
  ],
  "reasoning_effort": "low",
  "max_completion_tokens": 4096
}

data: {"choices":[{"delta":{"content":"","refusal":null,"role":"assistant"},"finish_reason":null,"index":0,"logprobs":null}],"created":1788765075,"id":"chatcmpl_example","model":"gpt-6-astra-2026-09-03","object":"chat.completion.chunk"}

data: {"choices":[{"delta":{"content":"Hi"},"finish_reason":null,"index":0,"logprobs":null}],"created":1788765075,"id":"chatcmpl_example","model":"gpt-6-astra-2026-09-03","object":"chat.completion.chunk"}

: Additional text deltas omitted

data: {"choices":[{"delta":{},"finish_reason":"stop","index":0,"logprobs":null}],"created":1788765075,"id":"chatcmpl_example","model":"gpt-6-astra-2026-09-03","object":"chat.completion.chunk"}

data: {"choices":[],"created":1788765075,"id":"chatcmpl_example","model":"gpt-6-astra-2026-09-03","object":"chat.completion.chunk","usage":{"completion_tokens":12,"completion_tokens_details":{"accepted_prediction_tokens":0,"audio_tokens":0,"reasoning_tokens":0,"rejected_prediction_tokens":0},"prompt_tokens":18,"prompt_tokens_details":{"audio_tokens":0,"cache_write_tokens":0,"cached_tokens":0},"total_tokens":30}}

data: [DONE]

{
  "model": "gpt-5.6-sol",
  "messages": [
    {
      "role": "user",
      "content": "What is the weather in Boston, MA, in celsius? Use the weather tool."
    }
  ],
  "reasoning_effort": "none",
  "tools": [
    {
      "type": "function",
      "function": {
        "name": "get_current_weather",
        "description": "Get the current weather for a city.",
        "parameters": {
          "type": "object",
          "properties": {
            "location": {
              "type": "string",
              "description": "City and state, for example Boston, MA."
            },
            "unit": {
              "type": "string",
              "enum": [
                "celsius",
                "fahrenheit"
              ],
              "description": "Temperature unit."
            }
          },
          "required": [
            "location",
            "unit"
          ],
          "additionalProperties": false
        },
        "strict": true
      }
    }
  ],
  "tool_choice": "auto"
}

import os
import time
import random
from openai import OpenAI, RateLimitError

client = OpenAI(
    base_url="https://api.cometapi.com/v1",
    api_key=os.environ["COMETAPI_KEY"],
)

def chat_with_retry(messages, max_retries=3):
    for i in range(max_retries):
        try:
            return client.chat.completions.create(
                model="gpt-6-astra",
                messages=messages,
                reasoning_effort="low",
            )
        except RateLimitError:
            if i < max_retries - 1:
                wait_time = (2 ** i) + random.random()
                time.sleep(wait_time)
            else:
                raise

messages = [
    {"role": "developer", "content": "You are a helpful assistant."},
    {"role": "user", "content": "What is Python?"},
    {"role": "assistant", "content": "Python is a high-level programming language..."},
    {"role": "user", "content": "What are its main advantages?"},
]