GPT Image 2.5: the image flagship that writes multi-round editing consistency into the API contract
OpenAI's image generation and editing model released 2026-09-08, in two variants: Flare (the default, higher quality than GPT Image 2 at 50% lower latency) and Sunburst (the precision tier, trading longer generation time for fidelity on intricate detail). Four endpoints in total, each variant with text-to-image and edit, identical API surface and identical pricing. Capability surface: 3840px long edge, six quality levels (auto/low/medium/high/xhigh/max, two above the previous ceiling), editing with up to 16 reference images per request, optional mask, and real alpha transparency on PNG/WebP. The launch weight sits on consistent details across multiple edits and comment-based edits that change only what you ask, i.e. multi-round editing that does not drift. Third-party reading: on the Artificial Analysis arena this site syncs (2026-09-22), sunburst is #1 on both text-to-image (Elo 1423) and image editing (1526), with flare #2 on both (1401/1482), the only family holding two crowns at once; both rows are still preliminary, however, with vote counts (8,791/8,014) far below the gpt-image-2 row they overtake (82,862). Closed, reachable only through ChatGPT and the API, no self-hosting or fine-tuning. Not benchmarked by us; graded C (vendor-stated).
