OpenAI CEO Altman said Wednesday that the GPT-4.5 model, known internally as Orion, will be available "in a few weeks." Foreign media reported in November that Orion has not yet achieved the performance expected by OpenAI. Altman said the model will be the last one the company has launched that does not use additional computing power to mimic the way humans reason. OpenAI has adopted inference models in some of its newer models, including o1 and o3.