What is Claude Code?

Claude Code is an AI-powered agentic coding tool from Anthropic that runs in your terminal, IDE, and on the web. It reads your entire codebase, understands your project structure, and takes action by editing files, running shell commands, and managing Git from natural language instructions. You describe what you want. Claude Code figures out how to do it.

Think of it as a coding assistant that knows your project inside out, from files and dependencies to how everything connects.

Claude Code is available across five environments: the terminal CLI, a VS Code extension, JetBrains IDEs (beta), a desktop app, and the web at claude.ai/code. The terminal CLI is the flagship experience and where most developers start.

The "agentic" label describes how Claude Code operates. It takes actions, observes results, and adjusts. When Claude Code encounters a failing test after making changes, it reads the error, identifies the cause, and attempts a fix. That cycle of acting and self-correcting runs autonomously until the task is done or it needs your input.

It runs on the Claude model family. The default model is Sonnet 4.6, with Opus 4.6 available for complex reasoning tasks. You can switch models mid-session using the /model command or set a default with the ANTHROPIC_MODEL environment variable.

How does Claude Code work?

Claude Code works through an agentic loop. You describe a task in natural language, and Claude reads your codebase for context, plans the approach, then executes by editing files, running shell commands, and checking results. It asks permission before making changes and manages context automatically by summarizing earlier conversations when sessions run long.

Here's what a typical session looks like in the Claude Code CLI:

$ cd my-project
$ claude
> Refactor the authentication module to use JWT tokens instead of session cookies

Claude reads 14 files in src/auth/...
Planning: 1) Update auth middleware 2) Add JWT utilities 3) Migrate session logic 4) Update tests
Editing src/auth/middleware.ts...
Editing src/auth/jwt.ts (new file)...
Running: npm test -- --grep auth
All 12 auth tests passing.

The agentic loop follows a cycle:

Flowchart showing a cyclical workflow: "You describe a task" → "Claude reads context" → "Plans the approach" → "Executes action" → "Verifies results" → back to start.

Each step in the loop builds on the previous one:

You describe the task in plain language or paste an error message
Claude reads context from your project files, CLAUDE.md configuration, and previous conversation
Planning breaks the task into steps, using extended thinking for complex reasoning
Execution edits files, runs shell commands, and interacts with your tools
Verification runs tests, checks output, and confirms the changes work

Claude Code manages its context window automatically. Long sessions trigger auto-compaction, which summarizes earlier conversation to free up space. You can also use /clear to reset the context manually.

The permission model defaults to asking before it writes files or runs shell commands. You can configure this to auto-approve specific operations for faster workflows. I run with all permissions skipped, which lets Claude Code work uninterrupted. That level of trust is best built over a few months of hands-on experience.

Extended thinking is enabled by default, giving Claude a dedicated reasoning phase before it starts acting on complex problems.

What can you do with Claude Code?

Claude Code handles coding tasks across the full development cycle, from building features across multiple files and debugging complex issues to managing Git workflows and automating repetitive work. Product managers, writers, and analysts also use it for research, documentation, and data processing.

For developers, the common use cases include:

Build features that span multiple files and directories
Fix bugs by describing the symptom and letting Claude trace the issue through your codebase
Edit files across your entire project with structural changes (refactoring legacy code across dozens of files)
Write and run tests, then fix failures automatically
Manage Git workflows: commits, branches, pull requests, conflict resolution
Automate repetitive tasks like linting, migrations, boilerplate generation, and dependency updates

For other professionals, the use cases are growing fast. Product managers use Claude Code to write PRDs (product requirements documents), analyze competitors, and prototype features from markdown specs. Writers build research pipelines. Designers generate code from specifications. Analysts process and summarize data. The terminal CLI has a learning curve, but the desktop app, VS Code extension, and web interface offer more accessible entry points. Describing tasks in plain language is all that's required regardless of the surface.

For more on non-developer workflows, see Claude Code for product managers.

Solo developers report building products in days that previously took teams months. The speed gains are obvious after a week. So is the need to check everything it produces. The developers getting the most value treat it as a collaborator. They review its output, give it clear instructions, and course-correct when it drifts.

How is Claude Code different from Claude AI?

Claude.ai, like ChatGPT, is a browser-based chat interface for conversations. Claude Code is an agentic coding tool available as a terminal CLI, a desktop app, a VS Code extension, and on the web. The key difference from the chat interface is project-level access. Claude Code reads your files, runs commands, and persists memory through CLAUDE.md. Claude Desktop now includes Claude Code directly, with the same agentic capabilities as the CLI in a graphical interface.

Here's a quick comparison:

Feature	Claude.ai	Claude Desktop	Claude Code CLI	VS Code Extension
File access	None (copy-paste)	Full project directory	Full project directory	Full workspace
Memory	Session only	Persistent via CLAUDE.md	Persistent via CLAUDE.md	Persistent via CLAUDE.md
Customization	None	Skills, hooks, commands	Skills, hooks, commands	Skills, hooks, commands
Unique features	Quick answers	Visual diffs, app preview, connectors	Terminal automation	Inline diffs
Best for	Quick questions	GUI-preferred developers	Terminal-first workflow	Coding with an editor

Claude Desktop now includes Claude Code as its Code tab, giving you the same agentic capabilities as the CLI in a graphical interface. It adds visual diff review with inline comments, parallel sessions with automatic Git worktree isolation, app preview for running your dev server directly in the desktop, and connectors for GitHub, Slack, Linear, Notion, and more. The Windows version launched in February 2026.

The VS Code extension brings Claude Code into your editor with inline diffs, @-mentions for file context, and plan review alongside your code. Sessions transfer between surfaces. Prefix a message with & in the terminal to send a task to the web for long-running remote execution, or run /teleport to pull a web session back into your terminal.

What advanced features does Claude Code offer?

Claude Code's advanced features include Model Context Protocol (MCP) for connecting to external tools, subagents for delegating focused tasks, agent teams for parallel multi-session coordination, custom skills and slash commands for reusable workflows, hooks for event-driven automation, native GitHub integration, and Remote Control for managing sessions from your phone.

MCP (Model Context Protocol) is an open standard for connecting Claude Code to external data sources and tools like databases, APIs, design tools, and project management systems. You configure MCP servers in your project or global settings, and Claude Code can read from and write to those tools during a session. Connect to Figma for design-to-code workflows, Slack for team communication, Jira for ticket management, or your own custom tooling. MCP is what turns Claude Code into a general-purpose automation agent. See the Claude Code + Figma MCP Server integration for a real-world example.

Subagents are specialized helpers that run inside your session. When Claude Code needs to search your codebase, run tests, or investigate a file, it delegates to a subagent that works in its own context window and reports back. Built-in subagents include Explore (fast codebase search), Plan (research for planning), and General-purpose (multi-step tasks). You can create custom subagents for your own workflows.

Agent teams (experimental, CLI and Agent SDK only) go further. They spin up separate Claude Code sessions that coordinate through a shared task list and direct messaging. Unlike subagents, teammates can talk to each other, challenge each other's findings, and self-assign work. Large refactors, parallel code reviews, and multi-component features benefit most, but expect significantly higher token consumption since each teammate runs its own context window.

Custom skills and slash commands let you package reusable workflows in SKILL.md files. You can also build custom agents for specialized tasks. Create a /deploy-staging command, a /review-pr checklist, or a /generate-tests routine that your whole team shares. Claude loads these automatically based on context.

Hooks run shell commands before or after Claude Code actions. Auto-format code after every file edit. Run linting before a commit. Send notifications when a task completes. Hooks are your safety guardrails and automation layer.

GitHub integration works natively. Claude Code handles Git operations like staging, committing, branching, and creating pull requests. The GitHub Actions integration goes further, letting you tag @claude in any PR comment to get automated code review, implementation suggestions, or bug fixes right in your pull request. Teams use this for automated CI/CD feedback loops.

Remote Control (research preview, rolling out to Max users) lets you start a local session from the terminal, then continue it from your phone or any browser. Run /remote-control to generate a link. You can monitor progress, approve actions, and steer the session while away from your desk. Start a long-running task, take a walk, and check in from your phone.

How do you get started with Claude Code?

Install Claude Code with a single terminal command. On macOS or Linux, run curl -fsSL | bash. On Windows PowerShell, run irm | iex. Then navigate to your project directory, type claude, authenticate with your Anthropic account, and describe your first task. The native installer includes auto-updates.

Recommended installation (auto-updates included):

# macOS / Linux
curl -fsSL <https://claude.ai/install.sh> | bash

# Windows PowerShell
irm <https://claude.ai/install.ps1> | iex

Alternative methods (manual updates required):

# Homebrew (macOS)
brew install --cask claude-code

# WinGet (Windows)
winget install Anthropic.ClaudeCode

Many articles still list npm install -g @anthropic-ai/claude-code as the installation method. The native installer replaced it and includes automatic background updates so you always have the latest features and security fixes.

Navigate to your project directory, type claude, and authenticate with your Anthropic account. Claude Code asks if it's safe to run in the local directory. After you confirm, describe your first task.

Start small. Ask Claude to explain a confusing function or write a test for a module. Once you're comfortable, try larger tasks like refactoring a file, generating a pull request, or building a feature across multiple files.

How much does Claude Code cost?

Claude Code offers four pricing tiers: Claude Pro at $20/month for casual use, Max 5x at $100/month for regular professional use, Max 20x at $200/month for heavy daily use, and API pay-per-use. Claude Code requires a paid plan. Most professional developers gravitate toward Max or API billing.

Here's the breakdown (pricing as of February 2026):

Plan	Price	Usage	Best for
Pro	$20/month	Standard limits	Casual to regular use
Max 5x	$100/month	5x Pro limits	Hitting Pro limits weekly
Max 20x	$200/month	20x Pro limits	Professional daily use
API	Pay-per-use	Per input/output token	Variable or team use

The Pro plan works for casual exploration. Community reports suggest roughly 10-40 prompts per 5-hour window, though Anthropic doesn't publish exact limits. If you're using Claude Code for real development work and hitting rate limits, Max 5x is the natural upgrade.

For teams using the API, the average cost is $6 per developer per day, with 90% of users spending under $12/day. That comes from Anthropic's own data. Monthly, that works out to roughly $100-200/developer when using Sonnet 4.6 for most tasks.

Here's how to choose. If you're exploring Claude Code for the first time, start with Pro at $20/month. If you find yourself hitting rate limits during a workday, upgrade to Max 5x. Heavy daily users who rely on Claude Code for most of their development work should consider Max 20x. Teams with variable usage across developers often find API pay-per-use more cost-effective because you only pay for what you use.

How does Claude Code compare to other AI coding tools?

The AI coding tool space is crowded and converging fast. Most major tools now offer agent modes, MCP support, multi-file editing, and plugin ecosystems. The meaningful difference is the default workflow, and Cursor vs Claude Code captures that divide well.

Cursor is building the best AI-powered IDE. Its default workflow puts you in an editor where you review diffs and approve changes as they happen. Claude Code is building the best agentic coding experience. Its default workflow gives the AI more autonomy to run, and you step in to course-correct at the architectural level. Both tools cover similar ground in features. The choice is about how you prefer to work with AI.

Other tools in this space include Builder.io, Codex CLI (OpenAI), OpenCode (open-source), Gemini CLI (Google), and AmpCode. The space ships major updates monthly.

My setup leans into the agentic approach. I trust the latest models enough to let Claude Code run autonomously on most tasks, review the diff at a high level, and commit often so I can always roll back when something breaks. Some developers prefer reviewing every file change closely before approving. Both workflows produce good code. It comes down to how much trust you've built with the tool, the workflows you've set up with features like skills and custom agents, and how closely you want to inspect along the way.

FAQ

Q: Is Claude Code free to use?

A: Claude Code requires a paid subscription or API billing. The Pro plan starts at $20/month. For sustained use, most developers choose Pro, Max, or API pay-per-use.

Q: Is Claude Code better than ChatGPT for coding?

A: They serve different purposes. ChatGPT is a browser-based chat interface. Claude Code is an agentic coding tool that reads your local files, runs shell commands, and edits code directly across the terminal, desktop app, and VS Code. For tasks that require codebase context and multi-file changes, Claude Code has a structural advantage because it operates directly in your project. For quick conversational questions, either works.

Q: Can I use Claude Code without programming experience?

A: Yes. The terminal CLI has a learning curve, but the desktop app, VS Code extension, and web interface are more accessible starting points. Product managers use Claude Code to write PRDs, analyze competitors, and prototype features from markdown specs. Writers use it for research pipelines. The key is describing tasks clearly in plain language. Claude Code handles the technical execution.

Q: Does Claude Code work with my existing development tools?

A: Claude Code integrates with Git, GitHub, VS Code, JetBrains IDEs, and external services via MCP (Model Context Protocol). It runs in your terminal, desktop app, VS Code extension, or the web, and operates on your local project files. It doesn't require you to switch editors or adopt a new IDE.

Q: Is Claude Code really that good?

A: It depends on how you use it. A skilled developer who reviews output, gives clear instructions, and understands the codebase can compress hours of work into minutes. Developers report 2-4x time savings on tasks like debugging, test writing, and refactoring. The mixed feedback comes from unrealistic expectations. It hallucinates under ambiguity and produces code that needs review. Treat it as an amplifier, not autopilot.

Q: How is my code handled for privacy and security?

A: Claude Code processes your code through Anthropic's API. Code is sent to Anthropic's servers for model inference. Anthropic's usage policy states that API data is not used for training. For enterprise requirements, Anthropic offers additional data governance options. Review Anthropic's privacy policy for your specific compliance needs.

What's next

If you came here asking "what is Claude Code," the short answer is an agentic coding tool that reads your codebase, plans changes, and executes them autonomously. Developers use it for complex multi-file tasks, and non-technical professionals are using it for knowledge work like research, documentation, and data analysis.

The pace of development has been rapid. Agent teams, the desktop app, web access, and Slack integration all shipped in recent months.

Claude Code works best as an amplifier in skilled hands. Understanding what you're building still matters. But it compresses the time between "I know what I want" and "it's done."

Install Claude Code with a single command and try it on an existing project. Ask it to explain a confusing function or write tests for a module. Once you see the results, try something bigger.