OpenAI is nothing without its people

Alignment has been achieved internally

Finally... OAI internally talked about releasing open-source model since 2022 and we got close a few times since then. Now it is.

Harmony format is finally open-sourced. I still remember 3 years ago (before ChatGPT release) Shengjia Zhao, Daniel and I were brainstorming about the right abstraction for RL training, and that is the start point of the entire harmony library. github.com/openai/harmony

As GPT-5 launches today, it's hard to forget the first ChatGPT-4 model called 0915-gpt4 internally at 2022. Shengjia Zhao did RM, I did PPO and deployed it that Friday for John Schulman to test. First prompt was tic-tac-toe, and it played surprisingly well. Time flies!