GPT-5.5 launched. The 30-day GEO migration plan for B2B brands

GPT-5.5 launched April 23 2026 with a rebuilt web-search layer. ChatGPT now pulls 87% of brand citations from Bing's top organic results. Brands without Bing visibility are invisible in ChatGPT recommendations. The 30-day plan: audit, llms.txt + FAQPage schema, answer capsule rewrite, validate.