Introducing GPT-5.5 | OpenAI
openai.com/index/introducing-gpt-5-5
What Jamie wrote
Most of the highlights here are about coding. I fired up codex on Elixir's code and asked it to do a review and assessment. It came forward with strong suggestions and quickly understood everything. The model seemed notably fast to me. Just overall it is still mind-blowing how this is all evolving.