OpenAI just published official prompting guidance for GPT-5.5 — and buried inside it is a statement that will make a lot of developers cringe: “Begin migration with a fresh baseline instead of c...
OpenAI · April 23, 2026 Codename: Spud · Fact-Checked ✓ GPT-5.5 Is Here — Six Weeks After 5.4, With Double the Price and a Genuine Reason to Pay It OpenAI shipped GPT-5.5 (codename “Spud”)...