OpenAI is hosting an exclusive, invite-only event in San Francisco on May 5, coinciding with the launch of GPT-5.5. The "GPT-5.5 on 5/5" gathering aims to bring together developers and OpenAI team members for a "low-key meetup." This event follows the recent rollout of GPT-5.5, described as a "new class of intelligence for real work and powering agents."