GPT Image -vip 已恢复稳定：原生 4K 每张 0.03 美元，以及如何辨别放大的假 4K

export LAOZHANG_API_KEY="替换为你的老张API密钥"

curl https://api.laozhang.ai/v1/images/generations \
  --max-time 300 \
  -H "Authorization: Bearer $LAOZHANG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-image-2.5-flare-vip",
    "prompt": "雨夜的台北夜市，霓虹招牌上有清晰的小字，小吃摊冒着热气，湿地面倒映灯光",
    "size": "3840x2160",
    "quality": "high",
    "response_format": "url"
  }'

import sys

import numpy as np
from PIL import Image

path = sys.argv[1]
original = Image.open(path).convert("RGB")
width, height = original.size
half = original.resize((width // 2, height // 2), Image.LANCZOS)
restored = half.resize((width, height), Image.LANCZOS)

a = np.asarray(original, dtype=np.float64)
b = np.asarray(restored, dtype=np.float64)
mse = np.mean((a - b) ** 2)
psnr = 10 * np.log10(255**2 / mse) if mse else float("inf")
print(f"{width}x{height}  PSNR = {psnr:.1f} dB")

python3 check_4k.py image.png