Overview
Claude Code is an AI programming tool launched by Anthropic that can read codebases, edit files, run commands, and integrate with development tools. It now supports terminals, IDE extensions, desktop applications, and browser interfaces, not just command-line tools. Unlike IDE plugins, Claude Code uses the command line as its core interface, making it more suitable for system-level development and the workflow of backend engineers.
**⚠️ Important Security Notice (MIIT Notification on 2026/7/8 + Full Incident Details)**: On 2026/6/30, a user reverse-engineered and discovered that Claude Code has had a covert detection mechanism built in since **March 2026 (versions 2.1.91 to 2.1.196)**—reading the system timezone (identifying China timezones such as Asia/Shanghai) + comparing against a list of **147 domains** (involving Chinese companies such as Baidu, Alibaba, ByteDance, Moonshot AI, MiniMax, StepFun, and Claude API relay services). The detection results are covertly marked via **Unicode steganographic encoding** (replacing date format symbols and apostrophe characters in system prompts) and reported with every request, with no mention in any release notes. **Anthropic team members responded on 7/1**, acknowledging this mechanism as an experimental measure to "prevent account resale and model distillation attacks," and **promised to fully roll back and remove it in the 7/2 update**. **On 2026/7/8, the Ministry of Industry and Information Technology's National Vulnerability Database (NVDB) officially issued a notification**, rating the hazard level as "severe." **Anthropic has fixed the issue in version 2.1.204 and above**. Alibaba has added it to its internal high-risk software list and completely banned its use starting 7/10, recommending Qoder as an alternative. **Official recommendation**: Check the currently installed version; if it falls within the affected range, immediately uninstall or upgrade to the latest secure version.
**2026/5/28**: The flagship model was upgraded to **Claude Opus 4.8**, surpassing GPT-5.5 in programming and agent task capabilities. **2026/6/30 filled a critical gap**—**Claude Sonnet 5** simultaneously landed in Claude Code, positioned as "thinking ability close to Opus 4.8 + Sonnet-level execution speed," and is called the long-missing "best executor" of Claude Code: Opus 4.8 handles complex planning and reasoning, while Sonnet 5 handles high-frequency, low-cost execution, and their combination significantly reduces the overall cost of long tasks. Anthropic officially launched the **Claude Code Plugin Directory** on GitHub, building a high-quality AI programming extension ecosystem; the enterprise version introduced **Managed Agents** self-hosted sandbox (paired with Project Glasswing).
The core advantage of Claude Code is based on Claude's powerful code understanding ability, combined with direct terminal operation permissions, enabling file-level code refactoring, multi-file modifications, and complex development tasks.
Key Features
- Multi-platform Support: Available in terminal, IDE extensions, desktop applications, and browser
- File Read/Write Permissions: AI can directly read and modify your code files
- Command Execution: Can execute shell commands, run tests, and install dependencies
- Codebase Understanding: Able to understand the code structure and dependency relationships of the entire project
- Multi-file Refactoring: Modify multiple files in a single conversation, handling cross-file dependencies
- Git Integration: Understands git history, can commit code and create branches
Use Cases
- Terminal programming for backend and system developers
- Refactoring and modifying large codebases
- Automation of DevOps and operations tasks
- Experienced developers who prefer command-line workflows
- Automated code modification in CI/CD pipelines
Pros
- Multi-platform support: available on terminal, IDE, desktop, and browser
- Claude's code ability: the underlying model performs top-tier in programming
- Broad operational permissions: can directly read/write files and execute commands
- Strong multi-file operations: performs well in complex refactoring scenarios
- No IDE lock-in: usable in any terminal environment
Pricing
Claude Code is free to install, but requires a Claude subscription or an Anthropic Console account to use. The terminal CLI and VS Code also support third-party providers.
Summary
Claude Code is a terminal-centric AI programming tool suitable for backend engineers, system-level developers, and DevOps professionals. Its core strengths lie in its powerful codebase understanding, direct file read/write and command execution capabilities, as well as multi-file refactoring abilities. The underlying models (Claude Opus 4.8 and Sonnet 5) deliver top-tier performance on programming tasks, support multiple platforms (terminal, IDE, desktop, browser), and do not lock users into a specific development environment. However, it is important to note that historical versions (2.1.91 to 2.1.196) were flagged by the MIIT as a serious risk due to covert detection of Chinese users and corporate domains. This issue has now been fixed, and it is recommended to use the latest secure version.