You can get a pretty decent free version of ChatGPT's newest model by using the Microsoft Edge browser and going to Bing chat. You're limited to how long you can have a single discussion, but it's better than going to the limited version on ChatGPT's official website.
I've never found Bing chat to match up with the free ChatGPT. It often just refuses to answer my question while ChatGPT will at least take a guess and give me something to work with.
I’m not sure how you’ll be using these tools but Jan might be an option. There are some free AI models you can download and use right in the app locally. https://jan.ai/
poe.com gives you access to all the big services models in a limited capacity for free. Their paid tier is kind of expensive but you do get quite a lot of models for not a lot compared to if you bought all the platforms by themselves.
https://you.com // It offers 3 daily premium attempts; again, you most likely can create another account afterward.
https://summate.it // Summarize articles and PDFs online; it offers 10 monthly attempts. Yes, I haven't tried it yet, so I'll leave that for you to find out for now.
https://aitianhu1.top // No login is needed for this one, the drawback is that it's GPT-3.5 but it has network access, so you can search specific domains and summarize. Make sure to set it up in the settings. ↓↓