
The Technical Guide to Claude AI (2026): Models, Claude Code, and Enterprise Workflows
Claude has crossed a threshold. With the February 2026 release of Sonnet 4.6 — now the default model on claude.ai — Anthropic has delivered Opus-class reasoning at Sonnet pricing. But the model upgrade is only part of the story. Claude Code now runs agents in your terminal overnight. Plugins extend it with custom skills. Excel connects to live financial data via MCP. This guide is the unified technical manual that ties it all together: model comparison, CLI installation, plugin marketplace setup, prompt engineering, and enterprise workflow integration — everything a developer or tech lead needs to actually build with the 2026 Claude ecosystem.


