How to use Claude for longer proposals, careful tone and client-facing writing.

By Jason Sibley
This guide is for UK and Irish small business owners and marketers who spend real time writing: proposals, client emails, website copy, case studies. If you've used ChatGPT for quick copy but find longer, more formal pieces come out clunky or need heavy editing, this is worth a look. It suits anyone who wants a careful, professional tone rather than punchy ad copy. Think proposals and About pages, not TikTok captions.
Claude is an AI assistant from Anthropic, built by chatting with it at claude.ai. What makes it useful for business writing specifically is that it tends to write in a more measured, less "salesy" register by default, and it can work with longer documents. You can paste in a full proposal, a set of client notes, or several pages of background without chopping things into small chunks.
Claude also has features for working with files and documents directly (rather than just chat), letting you upload or create files it can read and