ChatGPT 4

Account required? Yes
Cost: Free version as well as paid version with upgraded features
Company: OpenAI

"OpenAI is an AI research and deployment company. Our mission is to ensure that artificial general intelligence benefits all of humanity."

CoPilot

Account required? No
Cost: Free
Company: Microsoft

This AI is integrated into the Windows Operating System and can be utilized on its own or as part of other Microsoft Products such as Word and Excel.

Gemini

Account required? Yes
Cost: Free
Company: Google

"Gemini is an experiment powered by Google’s PaLM 2 model that enables you to collaborate with generative AI. As a creative and helpful collaborator, Gemini can supercharge your imagination, boost your productivity, and help you bring your ideas to life—whether you want help planning the perfect birthday party and drafting the invitation, creating a pro & con list for a big decision, or understanding really complex topics simply."

Poe

Account required? Yes
Cost: Free version as well as paid version with upgraded features
Company: Quora

"Poe acts as a kind of AI model aggregator that'll help you talk with millions of chatbots, including ChatGPT, GPT-4, DALL-E 3, and Claude 3 Opus."

Claude 3.5

Account required? Yes
Cost: Free version as well as paid version with upgraded features
Company: Anthropic

"Anthropic is an AI safety and research company. We build reliable, interpretable, and steerable AI systems."

Perplexity

Account required? Yes
Cost: Free version as well as paid version with upgraded features
Company: Perplexity

"Perplexity is a free AI search engine designed to revolutionize the way you discover information. Ask any question, and it searches the internet to give you an accessible, conversational, and verifiable answer. Think of Perplexity as a research partner, always on the clock, saving you valuable time by providing the precise knowledge you need."