I Wrote the Same LinkedIn Post With ChatGPT, Claude and Reshaper AI. Here's Which One Sounded Human.

Short answer: all three wrote a post I could use. Claude sounded the most like me, because it changed the least. Reshaper AI gave the most finished LinkedIn post, with a hook up top and a question at the end. ChatGPT gave the most polished one, and that polish is exactly what made it sound like every other AI post.

The difference was smaller than I expected. Here's the full test, with every output unedited, so you can judge for yourself.

One note before we start: we make Reshaper AI. So read our verdict with that in mind, and look at the three posts yourself. They're all below, word for word.

The test

I wanted a fair test, so I kept it simple:

• One input for every tool. A messy, 234-word voice-note style draft I wrote about why busy founders struggle to post.
• One run per tool. No retries, no picking the best of five.
• No edits. What you see is what each tool gave back.
• A normal prompt. For ChatGPT and Claude, I typed what most people would type: "Turn these raw thoughts into a LinkedIn post:" followed by the draft.

The tools:

I also wanted to test Taplio and Supergrow. Both need an account before their AI writer works, so I left them out rather than guess.

The input

This is the raw draft every tool got. Notice it's one long paragraph, has a "lol" in it, and rambles a bit. That's on purpose. That's how most people's real notes look.

You can spend the whole morning dealing with clients, making decisions, getting work done, and then open a blank document for your own post and suddenly have absolutely nothing. I can see how that happens because look at everything you have to figure out before you even start writing. What am I talking about, who is this for, did I already post something similar, should this be a video, do I need an image, does this sound like something everyone knows already. Then you go look at someone else's content to get an idea and come back wanting to change your whole approach lol. The actual paragraph might take ten minutes once you know what you're saying. Getting to that point can eat the time you had available. So when someone tells a busy founder to just be more consistent, I feel like there's a whole part of their day being ignored. The client deadline is still there while they're deciding whether the opening sounds embarrassing. Having some things decided already would help, even basic things like who you're trying to reach, a few subjects you keep coming back to, somewhere to put ideas when they happen. You'd still have to write and make choices, obviously. But you wouldn't be opening the document and figuring out your audience, your message and your entire online personality again every single time you wanted to say something.

Output 1: ChatGPT

You can spend the whole morning talking to clients, making decisions, and getting work done.

Then open a blank document to write your own LinkedIn post and suddenly have absolutely nothing.

Which makes sense when you look at everything you’re trying to decide before you’ve written a sentence:

What am I talking about?

Who is this for?

Have I posted this before?

Should it be a video?

Do I need an image?

Does everyone already know this?

Then you look at someone else’s content for inspiration and come back wanting to change your entire approach.

The actual paragraph might take ten minutes. Figuring out what you want to say can eat the whole window you had available.

That’s the part I think gets missed when busy founders are told to “just be more consistent.”

The client deadline hasn’t moved while you’ve been deciding whether your opening line sounds embarrassing.

Having a few things decided in advance helps:

- Who you’re trying to reach

- A few subjects you keep coming back to

- Somewhere to put ideas when they happen

You’ll still have to write. You’ll still have to make choices.

But you won’t have to work out your audience, your message, and your entire online personality every time you open a document.

What it did well: clean structure, easy to read, and it turned my rambling questions into a tidy list.

What I didn't like: it sanded me down. The "lol" is gone. "I feel like" is gone. Lines like "You'll still have to write. You'll still have to make choices." are that short, punchy rhythm you see in a thousand LinkedIn posts. It also changed "would help" to "helps," which turns my guess into a rule. It reads well, but it reads like a LinkedIn post, not like me.

Output 2: Claude

You can spend the whole morning dealing with clients, making decisions, getting work done, and then open a blank document for your own post and have absolutely nothing.

I get how that happens. Look at everything you have to figure out before you write a single word.

What am I talking about? Who is this for? Did I already post something like this? Should it be a video? Do I need an image? Does this sound like something everyone already knows?

Then you go look at someone else's content for an idea, and you come back wanting to change your whole approach lol.

The actual paragraph might take ten minutes once you know what you're saying. Getting to that point can eat the time you had.

So when someone tells a busy founder to "just be more consistent," I feel like a whole part of their day is being ignored. The client deadline is still sitting there while they decide if the opening sounds embarrassing.

What would help is having some things decided already. Even basic stuff:

• who you're trying to reach

• a few subjects you keep coming back to

• somewhere to put ideas when they hit you

You'd still have to write and make choices, obviously. But you wouldn't be opening the document and figuring out your audience, your message and your whole online personality again every single time you want to say something.

What it did well: this is the closest to my own words. It kept "lol," kept "I feel like," kept the way I actually talk. It just cut the draft into paragraphs and turned the last few ideas into a short list.

What I didn't like: it barely changed anything, including the opening. The first line is long and doesn't give anyone a reason to click "see more." If you want your words kept, that's great. If you wanted help making it work as a post, you'll still have to do that part.

Output 3: Reshaper AI

I feel like “just be more consistent” ignores a whole part of a busy founder’s day.

You can spend the morning dealing with clients, making decisions and getting work done. Then you open a blank document for your own post and suddenly have absolutely nothing.

And I can see how that happens, because before you’ve written a paragraph, you’re already trying to figure out:

• What am I talking about?

• Who is this for?

• Did I already post something similar?

• Should this be a video?

• Do I need an image?

• Does this sound like something everyone knows already?

Then you go look at someone else’s content for an idea and come back wanting to change your whole approach lol.

The paragraph itself might take ten minutes once you know what you’re saying. But getting to that point can eat the time you had available. And the client deadline is still there while you’re deciding whether the opening sounds embarrassing.

So I think having a few things decided already would help, even basic things like:

• Who you’re trying to reach.

• A few subjects you keep coming back to.

• Somewhere to put ideas when they happen.

You’d still have to write and make choices, obviously. But you wouldn’t be opening the document and figuring out your audience, your message and your entire online personality again every single time you wanted to say something.

What takes you longer: writing the post or figuring out what you want to say?

What it did well: it pulled my strongest line ("just be more consistent" ignores part of a founder's day) up to the top as the opening, which is the line most likely to get someone to click "see more." It kept "lol" and my casual words. It added a closing question to get comments. And I didn't have to write a prompt.

What I didn't like: the lists have a blank line between every bullet, so the post looks longer than it is. And it added a closing question I didn't write. I like it here, but not everyone wants a question at the end of every post.

Side by side

So which one sounded human?

Claude, if "human" means "sounds like the person who wrote the notes." It changed the least.

Reshaper AI, if you want something that sounds like you and also works as a LinkedIn post, with an opening and an ending, without writing a prompt.

ChatGPT wrote the smoothest post, but smooth is the problem. It's the one most likely to blend in with the AI posts people are scrolling past.

What this test doesn't tell you

To keep this honest:

• It's one input. A different draft could give different results. A one-line topic, instead of real notes, would likely make all three sound more generic.
• Prompts matter. A better prompt, or pasting in a few of your own posts as examples, would improve ChatGPT and Claude. Most people don't do that every time, which is why I used a plain one.
• Reshaper had my saved voice. That's how the tool is meant to be used, but it's an advantage the other two didn't have.
• It's my judgment. That's why all three posts are above, unedited.

What you can take from it

The biggest lesson isn't which tool won. It's that the input matters more than the tool. All three posts were usable because the draft had real thoughts in it: a real problem, real questions, a real opinion. Give any of them just a topic, and you'll get the generic post everyone is tired of.

So whichever tool you use:

1. Start from your own notes, a voice memo, or a video you already made. Not a topic.
2. Keep your casual words in. If the tool takes them out, put them back.
3. Check the first line. It's the one that decides if anyone reads the rest.
4. Read it out loud before you post. If it doesn't sound like you, change it.

Frequently asked questions

Which AI writes the most human LinkedIn posts?

In this test, Claude stayed closest to the original words, Reshaper AI kept the voice and added a stronger opening and ending, and ChatGPT gave the most polished but most typical AI-sounding post. The input you give it matters more than which tool you pick.

Can ChatGPT write LinkedIn posts that don't sound like AI?

Yes, if you give it your own notes instead of a topic and ask it to keep your words. Left to its defaults, it tends to tidy your writing into short, punchy lines that read like most other AI posts.

Is Claude better than ChatGPT for LinkedIn posts?

In this test, Claude kept more of the original voice, while ChatGPT made it more polished. Claude barely changed the opening, though, so you may still need to write a stronger first line yourself.

Why weren't Taplio and Supergrow in the test?

Both need an account before their AI writer works, so we left them out instead of guessing what they'd write.

What's the best way to get a human-sounding post from AI?

Start from your own raw thoughts, a voice memo, or a video transcript. Ask the tool to keep your words, check the opening line, and read the post out loud before you post it.