OpenAI upgrades ChatGPT and Codex with new GPT-6.1 Terra model

OpenAI has upgraded its medium-tier GPT-5.6 Terra model to GPT-6.1 Terra, improving speed, accuracy, and lowering costs by 50%. The new model enhances visual reasoning, computer task automation, and natural language capabilities, and is now available via ChatGPT Work, Codex, and API.