# Ask HN: How to rewrite `Claude.md` and install the skill for Opus5 and Fable5 > Source: > Published: 2026-07-28 06:29:39+00:00 | ||||||||||||||||| 1 point by | Anthropic has released the new Opus 5 and Fable 5 models. Many existing resources—such as `claude.md` files and custom skills—are no longer compatible with these new models. How should one rewrite or adjust `claude.md`, or develop skills better suited to these models? | |||||||||||||||| Applications are open till July 27. |