gpt-image-2-5-sunburst-image-to-imageimage-to-image4 paramsSunburst is the premium tier: tighter control and more polished output for campaign and product work, at the same posted price as Flare. Slug carries no vendor prefix despite the market/gpt/ doc path, and no dot in 2-5. Thirteen aspect ratios, and they are NOT GPT Image 2's sixteen — 27:16, 16:27, 9:8 and 8:9 are new here, while 5:4, 4:5, 2:1, 1:2, 3:1, 1:3 and 9:21 do not exist on 2.5. There is no `background` field at all, so transparency is not reachable on this tier. Unlike GPT Image 2, `auto` is NOT capped at 1K. Pricing: 6 credits ($0.03) at 1K, 10 ($0.05) at 2K, 16 ($0.08) at 4K. DOC CONFLICT: the OpenAPI block at docs.kie.ai declares no default on aspect_ratio or resolution, while kie.ai/gpt-image-2-5 states "auto" and "1K" and ships exactly those in its own request example — the stated defaults are used here, and both are enum members either way. Parameter-for-parameter identical to the Flare sibling. STALE DOC: its x-apidog-enum annotation still lists GPT Image 2's ratios; the `enum` the server validates against is the same thirteen used throughout 2.5.