The artificial intelligence research lab OpenAI has released GPT-4, the latest version of the groundbreaking AI system that powers ChatGPT, which it says is more creative, less likely to make up facts and less biased than its predecessor. Calling it "our most capable and aligned model yet", OpenAI cofounder Sam Altman said the new system is a "multimodal" model, which means it can take images as well as text as inputs, letting users ask questions about pictures. The new version can handle massive text inputs and can remember and act on more than 20,000 words at once, letting it take an entire novella as a prompt. The new model is available today for users of ChatGPT Plus, the paid-for version of the ChatGPT chatbot, which provided some of the training data for the latest release. OpenAI has also worked with commercial partners to offer GPT-4-powered services. A new subscription tier of language learning app Duolingo, Duolingo Max, will now offer English-speaking users AI-powered conversations in French or Spanish, and can use GPT-4 to explain the mistakes language learners have made.