ChatGPT-maker OpenAI has launched the latest version of its AI chatbot, GPT-5. "GPT‑5 excels at writing, research, analysis, coding, and problem-solving," OpenAI CEO Sam Altman said. It reportedly has enhanced coding abilities and comes with an upgraded voice mode. Users will also be able to customise the colour of the chats. GPT-5 lets users control how it thinks and responds.