Mercury Edit

Claude

The AI assistant that actually reads the whole document and holds its ground

Free plan

Ask Claude to summarize a 200-page report and it reads all 200 pages. That's not a figure of speech - its 200,000-token context window means you can paste an entire book, a year of emails, or a whole codebase and have a conversation about all of it at once. Most AI assistants quietly drop the earlier parts of long conversations. Claude doesn't. It's also unusually honest. Push back on a correct answer and Claude will explain why it's right rather than softening its position to keep you happy. That quality matters more than it sounds when you're using AI for research, analysis, or anything where you need accurate information more than agreeable information. For writing, Claude produces natural-sounding output with less formulaic phrasing and better paragraph rhythm than competitors. Anthropic built it with safety and honesty as design constraints, not afterthoughts, and it shows in day-to-day use.

ChatGPT

AI assistant with text, images, voice, code, and web browsing in one tool

Free plan

ChatGPT is the most widely used AI assistant, combining text, image generation, voice conversation, code execution, and web browsing. DALL-E 3 is built in for image generation. Advanced Voice Mode supports natural conversation. The code interpreter handles data analysis and visualization. Custom GPTs let you build or access specialized assistants for specific tasks - contract analysis, social media generation, tutoring, and thousands of others. ChatGPT covers the broadest range of capabilities compared to alternatives. The tradeoff: it's not always the strongest at any single task. Claude produces higher-quality writing. Perplexity returns better-cited research results. But if you need one tool that handles multiple types of work and connects to the widest third-party ecosystem, ChatGPT is the default choice.

Cursor

The AI code editor that edits your whole codebase, not just the line you're on

Free plan

Cursor is what happens when you build an editor around AI rather than adding AI to an editor. It's a VS Code fork, so your extensions and keybindings carry over, but the AI capabilities go significantly deeper than what Copilot can do as a plugin. The standout feature is multi-file editing. Describe what you want changed - "add authentication to all API routes" or "refactor this service to use the repository pattern" - and Cursor identifies every file that needs to change, shows you the diffs, and waits for your approval before applying anything. Getting six out of seven files right on a cross-cutting refactor is useful work that would take an hour manually. Codebase chat is the other one: ask "where does the user session get invalidated?" or "what does this function actually do?" and get accurate answers based on your actual code, not generic patterns. For joining a new codebase, this alone is worth the subscription price.

GitHub Copilot

The AI coding assistant that works in your editor without asking you to change anything

Free plan

Copilot's biggest advantage is not raw AI capability but distribution. It installs in VS Code, JetBrains, Vim, and most other editors you already use. You don't change your workflow at all - just get better autocomplete that suggests entire functions, not single lines. For teams with strict tool policies or organizations where not everyone will switch editors, this matters. Cursor may be technically stronger, but if half your team won't adopt it, Copilot's compatibility wins. Function-level completions have improved significantly and now work correctly more often than not. Context awareness across files is better. Copilot Chat has narrowed the gap with Cursor for specific questions. Limitations remain: you can't refactor across multiple files, and the chat feels added on rather than integrated into the core experience. At $10/month with a usable free tier, it's the natural first choice for developers new to AI-assisted coding.