Until this gets implemented in an open source AI chat UI, and now it doesn't matter what model you're using it with.
I love open source but their very nature suggests there is no one open source model that will have the critical mass to just be a straight in replacement for ChatGPT and its UI.
I use Ollama and choose models and they are close to GPT-4 but OpenAI is speeding up into making a useful chat product. All the rest are foundational model demos.