Claude Code
Claude Code is a proprietary command-line tool for AI-assisted coding, built by Anthropic (released 2025-02). Claude Code integrates with 4 verified models, including Claude Sonnet 4.6, Claude Opus 4.6, and Claude Haiku 4.5. Pricing starts at Included with Claude Pro/Max subscription (~$20-100/mo); API usage billed separately. Engineers run it from a terminal, where it can inspect repositories, edit files, call tools, and drive repeatable agentic coding workflows across local projects.
Overview
Autonomous coding agent that runs in the terminal, capable of editing files, running commands, and managing the entire development workflow with minimal human intervention.
Featured Model Specs
| Model | Lab | Released | Context | Reasoning | Open source |
|---|---|---|---|---|---|
| Claude Sonnet 4.6 | Anthropic | 2026-02-17 | 1M | Yes | No |
| Claude Opus 4.6 | Anthropic | 2026-02-05 | 1M | Yes | No |
| Claude Haiku 4.5 | Anthropic | 2025-10-01 | 200K | No | No |
| Claude Sonnet 4.5 | Anthropic | 2025-09-29 | 200K | Yes | No |
Model Compatibility Matrix
| Model | Lab | Default | Access tier | Notes |
|---|---|---|---|---|
| Claude Sonnet 4.6 | Anthropic | Yes | Pro | Default model |
| Claude Opus 4.6 | Anthropic | No | Pro | Most capable model |
| Claude Haiku 4.5 | Anthropic | No | Pro | Fast, lightweight model |
| Claude Sonnet 4.5 | Anthropic | No | Pro | — |
Underlying Models
Compare to Similar Harnesses
FAQ
What is Claude Code?
Claude Code is a proprietary command-line tool for AI-assisted coding, built by Anthropic (released 2025-02). Engineers run it from a terminal, where it can inspect repositories, edit files, call tools, and drive repeatable agentic coding workflows across local projects. It is primarily used for agentic coding from a local shell.
What models does Claude Code support?
Claude Code runs Claude Sonnet 4.6, Claude Opus 4.6, Claude Haiku 4.5, Claude Sonnet 4.5.
How much does Claude Code cost?
Claude Code costs Included with Claude Pro/Max subscription (~$20-100/mo); API usage billed separately.
Is Claude Code open source?
No, Claude Code is a proprietary command-line tool.
When was Claude Code released?
Claude Code was released in 2025-02.