Claude (Anthropic) might be the closest direct alternative to ChatGPT (but it's not available in alls countries).
You might also want to try ChatDolphin by NLP Cloud (a company I created 3 years ago as an OpenAI alternative): https://chat.nlpcloud.com
Open-source is also catching up very quickly. The best models you might want to try today are LLaMA 2 70B, Yi 34B, or Mistral 7B.
