OpenAI is working hard to empower everyone with intelligence that works for them, in the form of great products which get simpler to use over time.

We're bringing unlimited text chats with Luna, a quite capable model, to free users.

We've also released an updated version of Sol which works for both quick chats and for deep reasoning — historically these have been different models. This unification is a very significant step towards making ChatGPT simpler and more intuitive.
https://bird.makeup/users/openai/statuses/2085434712429052386