OpenAI's general-purpose assistant for writing, analysis, images and voice.
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Claude
Anthropic's assistant for long documents, careful reasoning and code.
Gemini
Google's assistant, wired into Search, Gmail, Docs and Android.
Grok
xAI's assistant with real-time access to posts on X.
Microsoft Copilot
Microsoft's assistant across Windows, Edge and Microsoft 365.
Perplexity
An answer engine that searches the web and cites every source.