If you're worried about losing access, and are willing to pay, you can sign up for an OpenAI account and use the OpenAI Playground with the 'text-davinci-003' model. I haven't tried using that model personally, but the model became available for public use around the same time ChatGPT came online, and they're both labeled as being in the GPT 3.5 family.

I would verify how similar the outputs are, but my trial credits have expired and I'd rather just use the free ChatGPT instead, hah.