{
  "title": "GPT Image 2.6 VIP and 2.5 VIP native 4K test, LaoZhang API",
  "generated": "2026-11-08",
  "timezone": "UTC+08:00",
  "endpoint": "POST https://api.laozhang.ai/v1/images/generations",
  "token_group": "default",
  "run": "Four requests sent at the same time from one machine; prompt identical in every request (see any request file).",
  "wall_seconds": 72.6,
  "total_charged_usd": 0.12,
  "files": [
    {
      "image": "gpt-image-2.6-flare-vip-3840x2160-high.png",
      "sha256": "73a5983f4088191f50b169a3383f64349da6e052d2c319d456278426aada0386",
      "bytes": 12114367,
      "pixels": [
        3840,
        2160
      ],
      "request": "gpt-image-2.6-flare-vip-3840x2160-high.request.json",
      "request_sha256": "1dcb0d35b8b86c9a6ee9c385e510e54caa237324a0e1155be83598977099368e",
      "response": "gpt-image-2.6-flare-vip-3840x2160-high.response.json",
      "response_sha256": "c90ccb6635028fcc247ba979abe46248ba9dd12197342a094bd74d7292b5648c",
      "model": "gpt-image-2.6-flare-vip",
      "size": "3840x2160",
      "quality": "high",
      "http_status": 200,
      "attempts": 1,
      "seconds": 35.8,
      "request_sent": "2026-11-08T22:45:02+08:00",
      "response_received": "2026-11-08T22:45:38+08:00",
      "charged_usd": 0.03,
      "charge_logged_at": "2026-11-08T22:45:36+08:00",
      "psnr_half_size_round_trip_db": 32.5,
      "c2pa": {
        "claim_generator": [
          "OpenAI Media Service API"
        ],
        "signer": "OpenAI OpCo, LLC",
        "data_hash_match": true,
        "c2patool_failures": [
          "signingCredential.untrusted"
        ]
      }
    },
    {
      "image": "gpt-image-2.6-sunburst-vip-3840x2160-high.png",
      "sha256": "5429ec0ca757502265140797937aa7a2e768e60fdd41f583ab8fa2377a05cc79",
      "bytes": 14810898,
      "pixels": [
        3840,
        2160
      ],
      "request": "gpt-image-2.6-sunburst-vip-3840x2160-high.request.json",
      "request_sha256": "3ffe422a1130a16d9129ee383e0984dcfeae42e796cd5fc06f10411dbb523d66",
      "response": "gpt-image-2.6-sunburst-vip-3840x2160-high.response.json",
      "response_sha256": "c81216722b344995f9e619c7e32868a1d33632bc32eba081ade0aeb9185c10c0",
      "model": "gpt-image-2.6-sunburst-vip",
      "size": "3840x2160",
      "quality": "high",
      "http_status": 200,
      "attempts": 1,
      "seconds": 72.6,
      "request_sent": "2026-11-08T22:45:02+08:00",
      "response_received": "2026-11-08T22:46:15+08:00",
      "charged_usd": 0.03,
      "charge_logged_at": "2026-11-08T22:46:13+08:00",
      "psnr_half_size_round_trip_db": 27.6,
      "c2pa": {
        "claim_generator": [
          "OpenAI Media Service API"
        ],
        "signer": "OpenAI OpCo, LLC",
        "data_hash_match": true,
        "c2patool_failures": [
          "signingCredential.untrusted",
          "signingCredential.invalid"
        ]
      }
    },
    {
      "image": "gpt-image-2.5-flare-vip-3840x2160-high.png",
      "sha256": "191b4eabe046c10705cba0cc87c78efd4d825592f5a334d11244db650162bac5",
      "bytes": 11139913,
      "pixels": [
        3840,
        2160
      ],
      "request": "gpt-image-2.5-flare-vip-3840x2160-high.request.json",
      "request_sha256": "1f234e13e4916349ee91fdbbd4638bf9234c0d1b02db518d7b82dafe25ec415a",
      "response": "gpt-image-2.5-flare-vip-3840x2160-high.response.json",
      "response_sha256": "656c45c783f58200e188c96ff660430eac5730ef06f638c4c1756479bd50d11a",
      "model": "gpt-image-2.5-flare-vip",
      "size": "3840x2160",
      "quality": "high",
      "http_status": 200,
      "attempts": 1,
      "seconds": 42.7,
      "request_sent": "2026-11-08T22:45:02+08:00",
      "response_received": "2026-11-08T22:45:45+08:00",
      "charged_usd": 0.03,
      "charge_logged_at": "2026-11-08T22:45:44+08:00",
      "psnr_half_size_round_trip_db": 34.7,
      "c2pa": {
        "claim_generator": [
          "OpenAI Media Service API"
        ],
        "signer": "OpenAI OpCo, LLC",
        "data_hash_match": true,
        "c2patool_failures": [
          "signingCredential.untrusted"
        ]
      }
    },
    {
      "image": "gpt-image-2.5-sunburst-vip-3840x2160-high.png",
      "sha256": "7c7b10826099ca5b319cd01b05ffbeb6f590236973419ce8fc8825697f5da336",
      "bytes": 11856606,
      "pixels": [
        3840,
        2160
      ],
      "request": "gpt-image-2.5-sunburst-vip-3840x2160-high.request.json",
      "request_sha256": "47ee338588469cb050ace9ef8067ad3ac0350a0c20a65f56a4432a2b966c63cc",
      "response": "gpt-image-2.5-sunburst-vip-3840x2160-high.response.json",
      "response_sha256": "9953d7e908e23a701c5e2fb74f9809d42beb4fd83fc38b96ba02b5d789ac9265",
      "model": "gpt-image-2.5-sunburst-vip",
      "size": "3840x2160",
      "quality": "high",
      "http_status": 200,
      "attempts": 1,
      "seconds": 44.1,
      "request_sent": "2026-11-08T22:45:02+08:00",
      "response_received": "2026-11-08T22:45:46+08:00",
      "charged_usd": 0.03,
      "charge_logged_at": "2026-11-08T22:45:45+08:00",
      "psnr_half_size_round_trip_db": 32.0,
      "c2pa": {
        "claim_generator": [
          "OpenAI Media Service API"
        ],
        "signer": "OpenAI OpCo, LLC",
        "data_hash_match": true,
        "c2patool_failures": [
          "signingCredential.untrusted",
          "signingCredential.invalid"
        ]
      }
    }
  ],
  "notes": [
    "Images are the bytes returned by the API, base64-decoded and saved unchanged. Verify with: shasum -a 256 <file>.",
    "Response files: the base64 image is replaced by its byte count and sha256; fields outside created/size/quality/output_format/background/data were removed, including the route's token usage block, because LaoZhang bills these models at a flat $0.03 per call and that block is not a billing record.",
    "charged_usd is the per-call charge in the account's usage log (15,000 quota units = $0.03).",
    "PSNR round trip: magick IMAGE -resize 50% -resize 200% roundtrip.png; magick compare -metric PSNR IMAGE roundtrip.png null:  (ImageMagick 7.1.2-35). Higher means less detail is lost when halved, i.e. less detail to begin with.",
    "Control: the 2.6 Flare image shrunk to 1536x864 and enlarged back to 3840x2160 scores 44.1 dB in the same round trip; the four native files score 27.6-34.7 dB.",
    "C2PA: each PNG carries a Content Credentials manifest whose claim generator is 'OpenAI Media Service API', signed by a certificate issued to OpenAI OpCo, LLC. c2patool 0.28.6 reports assertion.dataHash.match for all four files, so the image bytes were not changed after signing. It also reports signingCredential.untrusted for all four (its default trust list does not include these certificates) and, for the two Sunburst files, signingCredential.invalid ('certificate missing required EKU')."
  ]
}