Mr WhosetheBoss tested ChatGPT-5 and compared it to ChatGPT 4o and other older models. GPT5 is much better and it will become your default model for all free and paid OpenAI services. GPT5 will have better writing flair. GPT5 is not a step up in image generation. It is not better at every single thing ...

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Link :
https://www.nextbigfuture.com/2025/08/openai-gpt5-is-faster-and-better-then-4o.html