GPT-5.5 Is Out — What the Numbers Actually Say

Posts at radarlog.kr. Yesterday (April 23, 2026) OpenAI released GPT-5.5. Codename "Spud." The surprising part isn't the model itself. GPT-5.4 shipped six weeks ago. OpenAI's Chief Scientist Jakub Pachocki said during the briefing that the last two years have actually been slow. That one line is the real context for this release. Six Weeks, and "Spud" GPT-5.4 came out six weeks ago. The release before that was in December. The era when model releases were quarterly events is over. They're weekly-to-monthly events now. The reason this pace is possible is simple.