Codex by ChatGPT - Cloud agent for parallel dev tasks, powered by Codex-1
A cloud-based software agent, Codex handles tasks like writing features, fixing bugs, answering code questions, and proposing pull requests—each in a separate sandboxed environment preloaded with your repo.
OpenAI o1 - AI that can do general-purpose complex reasoning
A new large language model trained with reinforcement learning to perform complex reasoning. o1 thinks before it answers—it can produce a long internal chain of thought before responding to the user.