The long-awaited follow-up to ChatGPT has gone live, boasting of "human-level performance" in university-standard exams. OpenAI said GPT-4, the next generation of its artificial intelligence-powered chatbot, marked a "milestone" in the development of deep learning, which imitates how humans gain knowledge. "We've spent 6 months iteratively aligning GPT-4 using lessons from our adversarial testing program as well as ChatGPT, resulting in our best-ever results (though far from perfect) on factuality, steerability, and refusing to go outside of guardrails," the San Francisco-based company said in a blog post on Tuesday. OpenAI, which is backed by Microsoft, said the new version of its AI-powered chatbot is a "multimodal" model that can generate content from both images and text prompts. In an online demonstration, OpenAI President Greg Brockman showed GPT-4 creating a real website based on a hand-drawn mock-up.