What this Claude developer guide covers
Quick Start
Learn Claude Code from scratch with detailed installation guides and foundational tutorials. Get up and running with AI-assisted programming tools quickly and efficiently.
Core Mechanics
Deep dive into Claude's inner workings, including context management, agent systems, performance optimization, and advanced concepts for efficient usage.
Best Practices
Master real-world development workflows, debugging techniques, and advanced configurations. Boost productivity through proper CLAUDE.md setup and optimization.
What is Claude AI Dev?
Claude AI Dev is an unofficial community guide for Claude, Claude Code, and the Claude API. It turns official documentation and tested development patterns into practical installation guides, model selection advice, agent workflows, and migration checklists. The site is not affiliated with Anthropic; use Anthropic's official documentation for account, billing, policy, and API support.
Which Claude model should you use?
Start with Claude Opus 5.5 for complex coding and knowledge work. Opus 5.5 has a 1M-token context window, 128K maximum output, adaptive thinking, and a default `medium` effort. Sonnet 5.5 is the faster $2/$10-per-million-token option for everyday work, Haiku 4.5 is designed for high-volume processing, and Fable 5.1 is the escalation path for difficult long-horizon reasoning.
| Need | Recommended starting point | Why |
|---|---|---|
| Complex coding and long sessions | Claude Opus 5.5 | Long context, agentic coding, and knowledge work |
| Hardest research or reasoning | Claude Fable 5.1 | Deeper reasoning and long-horizon agent work |
| Fast everyday requests | Claude Sonnet 5.5 | Lower latency and lower token price |
| High-volume classification | Claude Haiku 4.5 | Fastest current Claude tier |
What can Claude Code do?
Claude Code is an agentic programming tool that works in your terminal and understands a codebase. A useful workflow is to give it a bounded goal, let it inspect the repository, review its plan, run tests, and verify the resulting diff. The guide covers CLAUDE.md instructions, context management, agents, MCP servers, debugging, performance, and safe tool use.
Claude AI Developer Guide FAQ
Is Claude AI Dev official?
No. This is a community-maintained resource. The About page explains the site's scope and the Contact page provides feedback and business contact details.
Is Claude down right now?
Check the official Claude status page first. It reports the health of Claude.ai, the Claude API, Claude Code, Cowork, and other components. Our Claude Status guide explains how to distinguish a platform incident from a local account, browser, or network issue.
Where should developers start?
Start with the Claude Code introduction, then read the model selection guide and the Opus 5.5 migration guide if you are upgrading an API integration.
Last reviewed: September 30, 2026 · Maintained by Claude Dev
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