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ChatGPT | Open AI Free, built on GPT-3.5 Not connected to the Internet. Trained on data only through mid-2021. |
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ChatGPT Plus |
Open AI Enterprise edition for large businesses. ChatGPT Business offering for smaller teams coming later. |
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Bing Chat | Microsoft Free, built on GPT-4 Use Edge browser or Bing mobile app. Or, see: New Bing Anywhere: an extension for using it in other browsers. Connected to the Internet with Bing search. |
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Google Free, built on PaLM 2. Connected to the Internet. |
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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 Free, built on GPT-3.5 and GPT-4 (for some queries) Connected to the Internet. You can use it without creating an account. Pro account also available. |
If you want to use the most capable model, try Bing Chat (based on GPT-4). It's free. If you're willing to pay $20/month, you could use GPT Plus, which is also based on GPT-4. Both Bing Chat and GPT Plus connect to the internet for finding answers, so it's easier to verify whether the output is true or not.
Perplexity AI is also free and you don't need an account (good for situations where you don't want to create an account). If you create a free account, you can get access to the more capable model (GPT-4).
Claude is also quite good, but not yet connect to the Internet. (This could change).
Google's Bard seems to be not quite as capable currently. (This could change).
For a list of more AI tools, see AI Tools Landscape by Carlos Lizarraga-Celaya.
These tools are based on language models like GPT-3 or GPT-4 (from Open AI).
Explainpaper
Upload a PDF, highlight confusing text, and get a simpler explanation. Useful for reading research papers outside your field. You can also get explanations in languages other than English. Learn more.
Elicit
Find answers from 175 million research papers. Elicit uses semantic similarity, which finds papers related to your question even if they don't use the same keywords. Learn more about Elicit. See also How to use Elicit responsibly.
Petal
Reference manager and more. Ask the AI to explain your selection, translate it into another language, or identify key points.
Scite AI assistant
A conversational tool made by Scite that lets you ask questions in simple language and get answers backed by real, up to date references. Think of like ChatGPT with real, up to date references, tailor-made for anyone discovering, understanding, or writing research.