AI coding agents have changed how software gets written. Autocomplete used to feel like the future. Today's agents plan architecture, write code, run tests, and fix bugs on their own. This review compares the popular ones and walks through which fits where.
What Is an AI Coding Agent?
An AI agent isn't a chatbot that hands you snippets. It's a system that reads your project, runs commands in your terminal, edits files, runs tests, and iterates on its own errors. Where autocomplete handles a line, an agent handles a task.
1. Claude Code (Anthropic)
Claude Code is Anthropic's CLI agent. Runs in your terminal with full filesystem access. It can run bash, do git, run tests. The standout feature is its context window. Up to 200K tokens, so it can hold large codebases in mind at once.
Best for: complex refactoring, working with large projects, DevOps automation.
Pricing: via Anthropic API (pay per token) or Claude Pro/Max subscription.
2. GitHub Copilot
Copilot is probably the AI tool the most developers have actually touched. It lives inside VS Code, JetBrains, and most other IDEs as real-time completion. With Copilot Chat and Agent Mode added, it's grown into a real agent that can edit multiple files and run commands.
Best for: daily coding, quick completions, working within the GitHub ecosystem.
Pricing: free tier (limited), $10/mo Individual, $19/mo Business.
3. Cursor
Cursor is a VS Code fork that bakes AI into the editor. Its signature move is Composer Mode: the agent edits multiple files at once, with awareness of how they depend on each other. Cursor indexes your whole codebase and uses that context to give sharper answers.
Best for: frontend development, rapid prototyping, developers accustomed to VS Code.
Pricing: free tier (limited), $20/mo Pro, $40/mo Business.
4. Windsurf (Codeium)
Windsurf is Codeium's IDE, another VS Code fork, pitched as 'the first agentic IDE.' Its hook is Cascade: it watches what you're doing in the editor and proactively suggests changes. Project-context handling is strong, multi-file editing works well.
Best for: developers who want a maximally automated IDE with minimal configuration.
Pricing: free tier, $15/mo Pro.
5. Devin (Cognition)
Devin was the first agent pitched as a real 'AI software engineer' that works fully on its own. It has its own browser, editor, and terminal in the cloud. You hand it a task and it plans, codes, tests, and deploys. Good for delegating routine work, but you'll want to review what it writes.
Best for: autonomous task execution from Jira/Linear, bug fixes, migrations.
Pricing: $500/mo (Team plan).
6. Bolt.new (StackBlitz)
Bolt.new builds full web apps right in the browser. You describe what you want, Bolt scaffolds the whole project: frontend, backend, database. It runs on WebContainers (Node.js in the browser), so there are no servers to wait on.
Best for: rapid prototyping, MVPs, landing pages, small full-stack projects.
Pricing: free tier (limited), from $20/mo Pro.
7. v0 (Vercel)
v0 is Vercel's AI tool for generating UI components. Describe an interface or upload a screenshot and it gives you a working React component with Tailwind CSS and shadcn/ui. It now also handles full Next.js projects.
Best for: UI component generation, design-to-code, Next.js projects.
Pricing: free tier, $20/mo Premium.
8. Replit Agent
Replit Agent lives inside Replit's cloud IDE. It can scaffold a project, install dependencies, set up a database, and deploy in one click. Especially handy for beginners and quick prototypes without setting up a local environment.
Best for: beginners, learning, quick cloud prototypes.
Pricing: free tier, $25/mo Replit Core.
Comparison Overview
Here are the key characteristics of each tool:
Claude Code — CLI, maximum autonomy, large context, pay per token
GitHub Copilot — IDE plugin, widest integration, from $10/mo
Cursor — IDE (VS Code fork), multi-file editing, from $20/mo
Windsurf — IDE (VS Code fork), proactive suggestions, from $15/mo
Devin — fully autonomous, cloud environment, $500/mo
Bolt.new — browser-based, project generation from scratch, from $20/mo
v0 — UI specialization, React + Tailwind, from $20/mo
Replit Agent — cloud IDE, one-click deploy, from $25/mo
Which One Should You Choose?
The choice depends on your workflow:
- For experienced developers working with large codebases — Claude Code or Cursor
- For daily coding with minimal barrier to entry — GitHub Copilot
- For rapid prototyping and MVPs — Bolt.new or v0
- For delegating routine tasks to the team — Devin
- For beginners and learning — Replit Agent
In practice, most developers end up combining tools. Cursor for daily work, Claude Code for the gnarly stuff. Try a few. Find what fits how you actually work.
Conclusion
The AI tooling space moves fast. New capabilities and new tools every month. At 51 Studio we use these in our own builds and help clients work out what fits theirs. If you'd like advice on picking tools or wiring AI into your workflow, get in touch.