OpenAI didn’t release a new model this time, but they open-sourced the core behind Codex: Codex Harness. There are already 936 Codex plugins available. iPollo Work topped the Codex open-source plugin leaderboard in 8 hours and broke into the top 2 of the DeepSeek Harness community plugin leaderboard in just 10 hours! Two rapid adaptations in a row—this is no coincidence.