ChatGPT has got its first major update in years in the form of GPT-5.

The GPT models are the AI technology that underpin ChatGPT. The new version will be available to all 700 million users of ChatGPT, its makers OpenAI said.

The last major version of GPT, number four, was released in 2023, though OpenAI has unveiled a number of smaller updates since then.

OpenAI has at once tried to present the new model as being transformative and safe. Chief executive Sam Altman has tweeted memes about the possible radical update it could include, for instance, but the introduction also stressed that the system is still a long way from replacing humans.

GPT-5 includes a host of upgrades including the ability to integrate different models and to automatically decide whether it needs to work harde

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