For $20 (£16) per month, subscribers will get access to the platform even at peak times when it can be hard to log onto, and also "priority access" to new features, chatbot creator OpenAI said. The chatbot has captured people's imagination by being able to mimic a wide range of writing styles, from journalist and doctor, to rock star and student essay writer. Google's is called Lamda, and was so convincing that Blake Lemoine, one of the engineers who worked on it, was convinced it was sentient