OpenAI has just released GPT-4.5, a new version of its flagship large language model. The company claims it is its biggest and best model for all-round chat yet. “It’s really a step forward for us,” says Mia Glaese,

Internally called Orion, GPT-4.5 is OpenAI’s largest model to date, and it’s first available through the company’s $200 monthly ChatGPT subscription.

OpenAI researchers said the new model was the company’s “best chat model yet,” citing an improved knowledge base and better contextual understanding.