YouTube thumbnail test set: n=4 on GPT Image 2.5 high may return 202

A four-take thumbnail test set at 1280x720 on ChatGPT Image 2.5 high costs about $0.1425 on Sume ($0.0356 each), and the call may come back as 202 instead of 200. Sume's image route waits up to 30 seconds, then returns a job envelope if the work is not done; the Image API docs name high quality, 4K and a large n as the likeliest slow configurations. Branch on the status code, not on the body shape.

Treat both outcomes as success. A 202 means Sume accepted and is still working; do not submit again.

What does the client look like?

On 200 the images are in data[].url. On 202 you poll the status URL and fetch the result, and the artifacts carry the Sume-hosted URLs.

import os, time, requests

B = "https://api.sume.com/v1"
H = {"Authorization": f"Bearer {os.environ['SUME_API_KEY']}"}

r = requests.post(f"{B}/images", headers={**H, "Idempotency-Key": "thumb-ep42"},
    timeout=60, json={"model": "openai/gpt-image-2.5", "n": 4,
    "prompt": "YouTube thumbnail: shocked chef, steaming pot, bold empty space left",
    "image_size": {"width": 1280, "height": 720}, "quality": "high"})
r.raise_for_status()
if r.status_code == 200:
    print([d["url"] for d in r.json()["data"]])
else:
    job = r.json()["data"]["job"]["id"]
    while not requests.get(f"{B}/jobs/{job}/status", headers=H, timeout=60).json().get("data", {}).get("terminal"):
        time.sleep(5)
    print(requests.get(f"{B}/jobs/{job}/result", headers=H, timeout=60).json())

What does the test set cost by quality?

Four 1280x720 takes of one prompt, no references. Lower tiers are less likely to cross the 30-second wait.

What about retries?

Reuse the same Idempotency-Key on a retry of the same request, so a lost response returns the original job rather than starting and billing a second one. A client timeout does not cancel the job, so keep the job id. Prices here are list x 1.25 in dollars per image before whole-cent rounding; the catalog's billable formula reads "list x 1.25, ceil usd cents", so confirm the first charge in usage.cost and budget from the invoice, not from the sum.