Ask Claude and ChatGPT for the same email and you will get two noticeably different drafts. Neither is wrong. They have different defaults, and once you know them you can pick the right tool or correct the other in a line or two.
The default habits
| Claude | ChatGPT | |
|---|---|---|
| Tone | Measured, a little formal | Upbeat, eager to help |
| Structure | Leans towards paragraphs | Leans towards headings and bullets |
| Style instructions | Tends to follow them closely | Follows them, but drifts back over long chats |
| Endings | Sometimes over-qualified | Often a summary or an offer to help more |
These are tendencies from how the products behave by default, and each release shifts them a little. The fixes below work regardless of version.
Emails
ChatGPT's first drafts tend to open warmly and close with a friendly flourish. Fine for customers, too much for a colleague. Claude's drafts are often closer to how a busy professional writes, sometimes a touch stiff. For quick internal emails, many people find Claude needs fewer edits. For warm outreach, ChatGPT's energy can help.
Long-form
For essays, reports and articles, Claude's habit of writing in paragraphs and holding a style guide across a long piece is a real advantage. ChatGPT is strong on structure and speed, useful when you want an outline and a fast first pass you will heavily rewrite.
Editing your own writing
Both are good editors when told to keep your voice. Without that instruction, both rewrite too much. The prompt that matters:
Edit this for clarity and length only. Keep my wording wherever
it already works. Show changes as a list of before and after,
not a rewritten version: [text]Make either one sound like you
Write the way I write: [three adjectives, e.g. short, direct,
dry]. Here are two examples of my writing: [paste].
Never: em dashes, exclamation marks, "I hope this finds you
well", a closing summary, or the words delve, seamless,
unlock or elevate.
Paragraphs over bullets unless I ask for a list.Put it in custom instructions (ChatGPT) or profile preferences (Claude). The examples do more than the adjectives.
So which one?
If most of your writing is long-form or follows a strict style guide, start with Claude. If it is fast, varied and often needs structure or visuals, start with ChatGPT. If you already pay for one, set it up properly before switching. The instructions above close most of the gap either way.
Questions people ask
Is Claude better than ChatGPT for writing?
Many writers prefer Claude's defaults for long-form and style-heavy work. With good instructions, the difference narrows a lot.
Which is better for copywriting?
ChatGPT is quick at generating many variations; Claude often gives fewer, more polished options. Try both on the same brief.
Can AI writing avoid sounding like AI?
Mostly, with a never list and real examples of your writing. Always do a final read aloud.
Where to take this next
For a wider comparison including Gemini, see Claude vs ChatGPT vs Gemini. The Pack gives you one set of writing instructions that installs in both.
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