GPT 4 vs GPT 5: Here’s what’s improved and what’s not so great with ChatGPT’s latest update

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…