When OpenAI started phasing out GPT-4o from the main ChatGPT interface, I noticed a surprising amount of backlash — not about benchmarks or features, but about tone.

A lot of people (myself included) felt that 4o had a certain conversational warmth that later models don’t quite replicate in the same way. That difference was subtle, but noticeable.

So I built a small side project for myself: https://www.ilove4o.com/

It’s a minimal interface that connects directly to GPT-4o via the OpenAI API. No extra layers, no personality hacks — just a focused 4o-only chat experience.

I’m sharing it here because: - There seems to be real user preference around model “personality.” - I’m curious whether others noticed the same behavioral shift. - It raises an interesting question: how much of perceived “friendliness” comes from system prompts, UI, or subtle model tuning?

If you try it, I’d genuinely love feedback — especially from people who’ve spent significant time with multiple model versions.

Happy to answer technical or architectural questions.