Anthropic opens claude.dev, a developer blog with Opus 5.5 playbooks and engineering write-ups

Anthropic launched claude.dev on September 30, a site for developers building with Claude. It gathers material that used to be scattered across the corporate blog, changelogs and threads on X. The @ClaudeDevs post drew 12,000 likes, and Addy Osmani, who built the site, said early posts include how the team made the claude.ai web app 3x faster in two weeks and how to get the most out of Opus 5.5.

The navigation is Home, Mods, Docs and Terminal, and posts are filed under Agents, Engineering, Playbooks, Skills and Tutorials. Featured now: "What a task costs on Opus 5.5," "The new rules of context engineering for Claude 5 generation models," "Lessons from building Claude Code: how we use skills," and "A harness for every task: dynamic workflows in Claude Code." There is no new model or pricing here; Anthropic describes it as a place to share tips and points of view from its developers.