GPT Image 2.5 API in practice, the five settings ChatGPT never shows you and how each one behaved
This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.
TL;DR: the api exposes five choices the chat app hides. Which of the two 2.5 models runs, which of five quality steps, any size up to 3840 wide, a real transparent background, and up to sixteen reference images with a mask. I ran each one and wrote down what happened, timings included. Prompt libra…
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- 2026-09-16 15:08 · r/comfyui
GPT Image 2.5 API in practice, the five settings ChatGPT never shows you and how each one behaved