OpenAI DevDay 2026 Set for September, With Focus on GPT-5.5 Ecosystem

OpenAI DevDay is the company’s flagship conference for developers worldwide and typically serves as a venue for unveiling models, APIs and development tools. This year’s event will focus on GPT-5.5, Image Gen and their application ecosystem, shaping developers’ future product-integration plans and positioning in the generative AI market.

OpenAI said DevDay 2026 will take place in San Francisco on September 29, 2026, returning as an in-person event. The conference will also invite developers to submit projects, with Codex automatically screening the entries. Publicly available information has not mentioned registration fees, prize money or any other monetary amounts.