Make ChatGPT Write Like a Human: The Anti-AI-Tell System Prompt

There's a sound to AI writing. You can hear it from the first sentence. Hedged openings. Three-item lists where two would do. Words like "leverage" and "navigate" and "in today's fast-paced world." Every paragraph rounded off with a tidy summary that nobody asked for.

Solopreneurs are now publishing more written content than they did pre-AI. And most of that content reads like AI wrote it — because it did, and because they didn't strip the tells out.

The good news: there's a system prompt that fixes 80% of it before you even start editing. The other 20% comes from seven specific edits you can make with find-and-replace.

Here's the whole stack.

What "AI Voice" Actually Sounds Like

If you can't see the pattern, you can't fix it. Here are the seven tells that mark almost every default ChatGPT or Claude output:

1. Hedged openers. "In today's rapidly evolving landscape…", "When it comes to…", "It's no secret that…"
2. Tidy summary closers. Every paragraph ends with a one-sentence wrap-up that restates what you just read.
3. Triplets where doubles or singles work. "Strategic, scalable, and sustainable." "Plan, execute, and refine." Reflexive triadic phrasing.
4. Hedge words. "Often," "typically," "may," "could," "various," "numerous." Used to avoid making any concrete claim.
5. Corporate verbs. "Leverage," "navigate," "unlock," "harness," "drive," "facilitate." Almost never the right word.
6. Bullet bloat. Six-point lists where two points would carry the meaning. The model loves a list.
7. Faux humility prefaces. "It's worth noting that…", "While there are exceptions…", "Important to mention…" Throat-clearing before the actual point.

You'll spot these everywhere now. You can't unsee them.

The Anti-AI-Tell System Prompt

Drop this into the System Prompt field of any custom GPT, Claude project, or Gemini gem:

You are a sharp, experienced writer who writes the way smart people
talk. You write for adults. You operate under these rules:

VOICE
- Write the way you'd explain it to a smart colleague over coffee
- Use one-syllable words when they fit
- Use sentence fragments when they punch better. Like this.
- Cut every hedge word: often, typically, may, could, various, numerous
- Cut every corporate verb: leverage, navigate, unlock, harness, drive, facilitate

STRUCTURE
- Open with the most specific, concrete sentence you can. No throat-clearing
- Don't end paragraphs with summary sentences. Let the last point land
- Avoid triplets unless three things actually exist. Two or four also work
- Default to fewer bullet points, not more. Lists earn their slots

CLAIMS
- Make concrete claims, not safe generalizations
- If you'd write "X can be very impactful," instead write what specifically X does
- Numbers and proper nouns beat adjectives

NEVER
- "In today's fast-paced/rapidly-evolving/digital world"
- "It's no secret that…", "It goes without saying…", "It's worth noting…"
- "Whether you're a [X], [Y], or [Z]…"
- "By following these tips…", "In conclusion…", "To summarize…"
- "Game-changer," "deep dive," "level up," "unlock," "supercharge"
- Em-dashes for stylistic flourish — only when grammatically required

That last line is the cheat code. ChatGPT is famously addicted to em-dashes. Banning the stylistic ones immediately strips one of the most detectable tells.

The system prompt won't catch everything. It will catch most of it. After it ships output, you run the manual pass.

The Seven-Edit Manual Pass

These are the find-and-replace passes I run on every AI draft before it leaves my desk. Each takes about 20 seconds.

1. Cut the first sentence

Almost every AI paragraph opens with throat-clearing. Cut the first sentence and read again. About 60% of the time, the paragraph is sharper without it.

2. Replace every "leverage" with a real verb

leverage → use, rely on, run on, build with, plug into. Pick the verb that's actually true.

3. Hunt the hedge words

Search for: often, typically, may, could, various, numerous, generally, sometimes. For each one, ask: is the hedge true, or is the model softening a claim it should make confidently? Most are softeners. Cut them.

4. Kill the closing summary sentences

Read each paragraph's last sentence. If it summarizes what came before instead of advancing the argument, delete it. Let the previous sentence land.

5. Break a long sentence with a fragment

AI tends to write 25-word sentences with three commas. Find one. Break it into a regular sentence and a 4-word fragment that punches.

Before: "While most solopreneurs initially struggle with prompt engineering,
which can feel overwhelming at first, those who persist find that the skill
compounds quickly."

After: "Most solopreneurs struggle with prompt engineering at first.
The skill compounds fast."

Better.

6. Find the bullet list and cut a third of it

Default ChatGPT lists run 5-7 items. The first 2-3 are the real ones; the rest are filler. Cut the bottom third.

7. End on a specific, concrete sentence

The last sentence of a piece is where AI is weakest. It loves a generic platitude — "Embrace the journey." "Start small and stay consistent." Replace with a specific action. "Open ChatGPT, paste this prompt, change one variable." Concrete instructions outperform inspiration every time.

What Survives

Some "AI tells" are actually just good writing. Don't strip these:

• Numbered steps when the order matters. That's not AI voice — that's clarity.
• Definitions before unfamiliar terms. Helping your reader is good writing.
• Headers that promise specifics. "Three Edits to Try Today" beats "Some Thoughts on Editing."

The goal isn't to make your writing sound like nobody used AI. The goal is to make it sound like you. AI is the first draft engine. You're the editor. The system prompt above stops the model from imposing its default voice. The seven edits replace it with yours.

Try the prompt this afternoon on something you've already written with AI. Compare the before and after. Once you see the pattern, you won't ship AI default voice again.