ChatGPT
Best for breadthChatGPT is OpenAI's general-purpose AI assistant for writing, analysis, coding and research, available across web, mobile and API with team and enterprise tiers.
Why we picked it
The broadest feature surface and ecosystem: custom GPTs, data analysis, browsing and research features, and the most widely adopted API.
Watch out for
Plan and feature naming changes frequently, and usage limits vary by tier in ways that reward checking the current pricing page.