Claude
Anthropic's AI assistant for writing, analysis, research and coding. Known for careful reasoning, long documents and a natural writing voice.
ChatGPT
The assistant that brought AI to the mainstream. Chat, search, voice, image generation and agents in one app across web, desktop and phone.
Compare:ChatGPT vs ClaudeChatGPT vs GeminiChatGPT vs Perplexity
What it is
ChatGPT is the general-purpose starting point for many people. It can search the web, talk with you by voice, create images and work through multi-step tasks.
Custom GPTs and projects let you save instructions and files for work you repeat.
Similar tools
Gemini
Google's assistant, woven into Search, Gmail, Docs and Android. Strong at research, long context and anything inside the Google ecosystem.
Perplexity
An answer engine. Ask a question and get a direct, cited answer pulled from the live web, with sources you can check in one click.
NotebookLM
Upload your own sources and ask questions grounded only in them. Turns documents into study guides, briefings and audio overviews.