OpenAI’s GPT Image 2.5 models, particularly Sunburst and Flare variants released in early September 2026, anchor the 89.5% implied probability by dominating blind preference arenas with leading Elo scores for prompt adherence, legible text rendering, complex layouts, and iterative editing. These autoregressive systems build on prior GPT Image releases with reduced latency and stronger reference consistency, outpacing competitors in human-voted leaderboards as of mid-October. Google’s Nano Banana 2.1 series trails at 4.6% due to competitive editing and cost advantages but lower overall rankings, while Meta, Black Forest Labs’ FLUX variants, Ideogram, and others sit below 2% amid fewer recent capability leaps. Traders price in sustained OpenAI momentum through end-October resolution absent major counter-releases.