OpenAI’s big language model update was finally revealed to the public on Thursday and soon started rolling out to all users. After the GPT-5 launch, OpenAI decided to discontinue its older models running ChatGPT like GPT-4o, GPT-4.1, o3, o3 Pro, o4-mini and more.
For most use cases, GPT-5 takes over the reins from GPT-4o, the large language model which replaced GPT-4 as the default model on ChatGPT earlier this year.
In case you are wondering what exactly has changed…

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