OpenAI Announces DevDay 2026 for September 29, Gates Tickets Behind a GPT-5.5 Build Contest

DevDay returns to San Francisco with a twist: early tickets require building something with GPT-5.5 and the Image Gen API, with entries judged partly by Codex.

OpenAI confirmed DevDay 2026 for September 29 in San Francisco, as @OpenAI announced Wednesday. The event had been anticipated since OpenAI skipped a formal developer conference in 2025, and the developer community responded enthusiastically — @OpenAIDevs simply posted "We're so back" and the reply thread filled within minutes.

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