Claude Code

What is Claude Code about?

Claude Code brings a large‑language‑model coding companion into your command line. It embeds Claude Opus 4.1, giving deep awareness of entire codebases, the ability to edit files, run commands, and interact with your existing development stack without leaving the terminal.

How to use Claude Code?

1. Install the CLI (when available) and authenticate with your Anthropic API key.
2. Navigate to your project directory.
3. Run claude code <command> (e.g., claude code ask "add pagination to the user list").
4. Review the proposed changes; approve to apply them.
5. Optionally, integrate with VS Code or JetBrains via the provided extensions to see suggestions inline.

Key Features of Claude Code

• Agentic search: Understands whole repositories instantly, no manual file selection.
• Multi‑file coordinated edits: Updates dependent files in a single operation.
• Terminal‑first workflow: Runs inside your shell, leveraging existing tools (git, Docker, CI, monitoring services).
• IDE integration: Works with VS Code and JetBrains, displaying suggestions directly in code editors.
• Safe operation: Never modifies files without explicit user approval; respects coding standards and patterns.
• Extensible: Configurable via SDK, can be scripted in CI/CD pipelines or GitHub Actions.

Use Cases of Claude Code

• Rapid onboarding: New team members ask the assistant to explain architecture or locate specific functionality.
• Issue‑to‑PR automation: Convert GitHub/GitLab issues into code changes, run tests, and open pull requests entirely from the CLI.
• Large refactors: Perform systematic changes across many files (e.g., rename a library, update API contracts).
• Test generation: Generate unit or integration tests for existing code sections.
• CI/CD enhancement: Embed Claude commands in pipelines to auto‑fix linting errors or update dependencies.

FAQ from Claude Code

Q: Do I need to grant repository access? A: Claude Code runs locally and reads files from your working directory; no external repository cloning is required.

Q: Will Claude Code commit changes automatically? A: No. All modifications are presented for review and require explicit approval before being written.

Q: Which languages are supported? A: Claude Opus 4.1 is optimized for a wide range of programming languages, including JavaScript/TypeScript, Python, Go, Java, Ruby, and more.

Q: How does Claude Code integrate with my CI system? A: You can invoke Claude commands in CI scripts or GitHub Actions, and configure spend limits via the Anthropic console.

Q: Is there a free tier? A: Usage follows Anthropic’s API pricing model with pay‑as‑you‑go rates; additional usage limits may apply.

Title: Claude Code: Deep coding at terminal velocity \ Anthropic

URL Source: https://www.anthropic.com/claude-code

Markdown Content: Your code’s new collaborator

Unleash Claude’s raw power directly in your terminal. Search million-line codebases instantly. Turn hours-long workflows into a single command. Your tools. Your workflow. Your codebase, evolving at thought speed.

Command-line AI, from concept to commit

Watch as Claude Code tackles an unfamiliar Next.js project, builds new functionality, creates tests, and fixes what’s broken—all from the command line. Join Boris and Cat as they show you what coding feels like when you’re not doing it alone.

Claude Code embeds Claude Opus 4.1—the same model our researchers and engineers use—right in your terminal. It has deep codebase awareness and the ability to edit files and run commands directly in your environment.

Powerful intelligence

• Uses agentic search to understand your entire codebase without manual context selection
• Makes coordinated changes across multiple files
• Optimized specifically for code understanding and generation with Claude Opus 4.1

Works where you work

• Lives right inside your terminal—no context switching
• Integrates with VS Code and JetBrains IDEs
• Leverages your test suites and build systems

You’re in control

• Never modifies your files without explicit approval
• Adapts to your coding standards and patterns
• Configurable; build on the SDK or run on GitHub Actions

Works with your IDEs

Claude works directly in VS Code and JetBrains, seeing your entire codebase instead of just isolated snippets. It understands your project structure and existing patterns, making suggestions that actually fit and presenting them directly in your code files. No copying and pasting—just building.

... and your favorite command line tools

Your terminal is where real work happens. Claude Code connects with the tools that power development—deployment, databases, monitoring, version control. Rather than adding another interface to juggle, it enhances your existing stack. Less context-switching.

What could you do with Claude Code?

Code onboarding

Claude Code maps and explains entire codebases in a few seconds. It uses agentic search to understand project structure and dependencies without you having to manually select context files.

Turn issues into PRs

Stop bouncing between tools. Claude Code integrates with GitHub, GitLab, and your command line tools to handle the entire workflow—reading issues, writing code, running tests, and submitting PRs—all from your terminal while you grab coffee.

Make powerful edits

Claude Code’s understanding of your codebase and dependencies enables it to make powerful, multi-file edits that actually work.

Big fans of Claude Code

“

I'm an infra and backend guy, but with Claude 3.5 Sonnet being so good, I now feel like I'm an everything guy.

Ethan

@ethancatzel

“

Claude Code has dramatically accelerated our team's coding efficiency. I can now write EDA code in a notebook—pulling data, training a model, and evaluating it with basic metrics—and then ask Claude to convert that into a Metaflow pipeline. This process saves 1-2 days of routine (and often boring!) work per model.

Anton Biryukov

Staff Software Engineer at Ramp

“

Claude Code marks a threshold moment for AI in software development. At Intercom, it enables us to build applications we wouldn't have had bandwidth for—from AI labeling tools to ROI calculators for our Sales team. Its ability to handle complex, multi-step tasks sets it apart from alternatives. Claude Code is fundamentally changing what's possible for our engineering teams.

Fergal Reid

VP of AI at Intercom

“

Some interesting data on how Anthropic’s Sonnet 3.5 seems to remain by far the most capable LLM for coding. Every single leading GenAI-powered IDE (Cursor, Windsurf, Zed, Copilot etc) favor this model. A good question: how is Claude so much better for code generation?

Bradley Silicani

COO, Anrok

What developers say about Claude Code

“

Claude Code has dramatically accelerated our team’s coding efficiency. I can now write EDA code in a notebook—pulling data, training a model, and evaluating it with basic metrics—and then ask Claude to convert that into a Metaflow pipeline. This process saves 1-2 days of routine (and often boring!) work per model.

Anton Biryukov

Staff Software Engineer at Ramp

“

Claude Code marks a threshold moment for AI in software development. At Intercom, it enables us to build applications we wouldn’t have had bandwidth for—from AI labeling tools to ROI calculators for our Sales team. Its ability to handle complex, multi-step tasks sets it apart from alternatives. Claude Code is fundamentally changing what’s possible for our engineering teams.

Fergal Reid

VP of AI at Intercom

Get started with Claude Code

*Additional usage limits apply. Prices shown do not include applicable tax.

Anthropic API

Pay-as-you-go with standard Anthropic API pricing.

• Deploy Claude Code to unlimited developers

• No per-seat fees or platform charges

• Set spend limits and monitor usage through the Console

• Support for Amazon Bedrock and Google Cloud Vertex AI

Prices shown do not include applicable tax. Usage limits may apply.

Education plan

A comprehensive university‐wide plan for institutions, including its students, faculty, and staff.

• Student & faculty access

Comprehensive access for all university members at discounted rates

• Academic research & learning mode

Dedicated API credits and educational features for student learning

• Training & enablement

Resources for successful adoption across your institution

Get the technical rundown

Developer docs

Claude Code documentation

Developer docs

Claude Code tutorials

Case study

How Anthropic teams use Claude Code

FAQs

Learn more

Developer docs