If you don't already have an OpenAI account, don't make one. You don't need it. There are several other ways to access it without an accounts. Shamelessly stolen from Reddit:
No Sign-Up:
Perplexity AI [https://www.perplexity.ai/] (web-browsing)
Vitalentum [https://vitalentum.net/free-gpt]
OraChat [https://ora.ai/chatbot-master/openai-chatgpt-chatbot]
Vicuna [https://chat.lmsys.org/]
GPTGO [https://gptgo.ai/] (web-browsing)
AnonChatGPT [https://anonchatgpt.com/]
NoowAI [https://noowai.com/]
Character AI [https://beta.character.ai/]
BAI Chat [https://chatbot.theb.ai/]
iAsk AI [https://iask.ai/] (web-browsing)
Phind AI [https://www.phind.com/] (web-browsing)
GPT4All [https://gpt4all.io/index.html] (open-source) [suggested by u/CondiMesmer]
DeepAI Chat [https://deepai.org/chat]
Teach Anything [https://www.teach-anything.com/]
Forefront AI [https://chat.forefront.ai/]
Sign-Up:
Poe AI [https://poe.com/ChatGPT]
Bard [https://bard.google.com/] (web-browsing)
Easy-Peasy AI [https://easy-peasy.ai/]
HuggingChat [https://huggingface.co/chat] (web-browsing)
WriteSonic [https://app.writesonic.com/chat]
FlowGPT [https://flowgpt.com/chat]
Sincode AI [https://www.sincode.ai/]
AI.LS [https://ai.ls/]
LetsView Chat [https://letsview.com/chatbot] (only 10 messages allowed)
CapeChat [https://chat.capeprivacy.com/]
Open-Assistant [https://open-assistant.io/] (open-source)
GlobalGPT [https://www.globalgpt.nspiketech.com/]
Bing Chat [bing.com/chat]
JimmyGPT [https://www.jimmygpt.com/]
Codeium [https://codeium.com/] *mainly for coding*
YouChat [you.com/chat]
Frank AI [https://franks.ai/]
OpenAI Playground [platform.openai.com/playground]
Great For Blog Articles (with chatbot):
Copy AI [https://app.copy.ai/]
TextCortex AI [https://app.textcortex.com/]
Marmof [https://app.marmof.com/]
HyperWrite [https://app.hyperwriteai.com/chatbot]
WriterX [https://app.writerx.co/]
Best File Chatbots (PDF's, etc.):
AnySummary [https://www.anysummary.app/] (3 per day)
Sharly AI [https://app.sharly.ai/]
Documind [https://www.documind.chat/]
ChatDOC [https://chatdoc.com/]
Humata AI [https://app.humata.ai/]
Ask Your PDF [https://askyourpdf.com/]
ChatPDF [https://www.chatpdf.com/]
FileGPT [https://filegpt.app/chat]
ResearchAide [https://www.researchaide.org/]
Pensieve AI [https://pensieve-app.springworks.in/]
Docalysis [https://docalysis.com/] (suggested by u/upsontown)
Best Personal Assistant Chatbots:
Pi, your personal AI [https://heypi.com/talk]
Kuki AI [https://chat.kuki.ai/]
Replika [https://replika.com/]
YourHana AI [https://yourhana.ai/]