This is not an exhaustive list and things are changing constantly.
ChatGPT | Open AI Free, built on GPT-3.5 Not connected to the Internet. Trained on data only through January 2022. |
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ChatGPT Plus |
Open AI
(as of Nov. 6, 2023: all these features combined into "all tools.") Enterprise edition for large businesses. |
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Bing Copilot | Microsoft Free, built on GPT-4 Generate images with DALL-E 3. Connected to the Internet with Bing search. |
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Gemini |
Google |
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Claude 2 | Anthropic Free. Also available in Slack. Built on their own model. Focused on reliability and safety. Not connected to the Internet (yet). |
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Perplexity AI | Perplexity Free, built on GPT-3.5. Connected to the Internet. You can use it without creating an account. Pro account also available that uses GPT4 or Claude2. |