Transparent backgrounds
GPT Image 2.5 (Flare and Sunburst) now has a Background control in the parameter panel, with three options:
Auto · Opaque · Transparent
Pick Transparent and you get a PNG with a real alpha channel — everything outside the subject is genuinely transparent, not white. That saves a cutout step for product shots, stickers and asset pieces.
The control only appears on GPT Image 2.5, because transparent output is specific to it.
Aspect ratios now follow the size tier
1K / 2K / 4K offer almost the same set of ratios: 1:1, 4:3, 3:4, 3:2, 2:3, 16:9, 9:16 and 21:9 are available at every tier, and 2K additionally offers 9:21. The ratio you choose is the ratio you get.
The panel now lists only the ratios a tier can actually produce. So 1:1 disappears when you switch to 4K — that isn't an omission, it's that the tier can't produce it.
Reference images are now priced per image
Starting today, attaching reference images to GPT Image 2 and GPT Image 2.5 counts toward the price:
| Model | Pricing |
|---|---|
| GPT Image 2 | First one free, +1 Xin for each after that |
| GPT Image 2.5 Flare / Sunburst | +1 Xin per reference image |
For example, a 1K low-refinement GPT Image 2.5 render is 1 Xin; attach one reference and it's 2. The price in the panel tracks the reference count live, so you see the final amount before you run it.
Why: the upstream for these two models bills for reference images per image, and larger references cost more — a 4K reference costs over three times a 1K one. That part wasn't reflected in the price before.
Not affected: reference images on every other image model remain free of extra charge; nothing about their usage or pricing changes.