GPT-5 was supposed to get rid of all the complicated AI models to choose from in ChatGPT, but that's not how it's panned out.

In a surprise twist, paid subscribers can once again use several older AI models, including GPT-4o, GPT-4.1, and o3. GPT-4o ...

In March, OpenAI published research exploring the emotional bonds users form with its models. In the conclusion of the ...

China’s ambition to turn its open-source artificial-intelligence models into a global standard has jolted American companies ...