DevDay Exchange Community: Paris

A community hackathon and demo night run ahead of OpenAI's official DevDay Exchange, hosted by the Paris startup studio Hexa with Codex Ambassadors Boris de Wit and Oleksandr Tsepukh. Teams build online from 24 to 26 October with Codex or the OpenAI API, starting from a kickoff call on the Saturday morning, then present in person on the Monday evening. Doors 18:00, demos and Q&A from 19:00, winners at 20:30, close at 22:00. Ten tickets to the official DevDay Exchange on 28 October go to the winners. Two free ticket types, hackathon participant or demo-night visitor, both approval-gated, with the exact address shared on registration. Why go: the demos are projects built over that weekend rather than slideware, and the prize puts the winners in the official OpenAI room two days later. Best for developers shipping with Codex and anyone who wants to see what the Paris build crowd is actually making.