Two AI models for one article. At first that sounds like overkill.

Claude already writes well. Why hand its draft to a second model?

Because the two are good at different things, and their makers agree on which.

Claude reads long sources, holds a structure and follows a brief. Hemmingway-1 is a 27B model trained on everyday writing, to sound like a person and to return only the text.

Here is the short version. Let Claude do the thinking. Give Hemmingway the few sentences a reader will judge: the opening, the ending, the email that announces the piece. Then check every rewrite against the draft, because a rewrite can change a fact as easily as a phrase.

One note before the steps. I have not added a worked before-and-after example yet. And this helps when your draft is accurate and still reads like an assistant wrote it. It does not help when the draft is empty. If it has no view and no detail of yours, fix that first. How to Write with AI Without Losing Your Voice covers how.

Disclosure: I build StashBase, the app used in the steps. The same split works with any two tools, and the last section says how.

Why split the work?

Each model gets the part it is better at.

(1) Claude wins at everything that is not the sentence.

Hemmingway’s makers say so in their own comparison: Claude wins on long stories and on “everything that is not writing.”

(2) Hemmingway-1 sounds more like a person, in its makers’ tests.

A judge model took its replies for the human one more often than Fable 5.1’s, 1032 to 1006. Those are the makers’ own tests, and the judge was a model. Treat that as a reason to try it, not as a verdict.

(3) Its limits decide where it goes in the workflow.

It is English-first. It can be wrong while sounding sure. It writes in its own voice.

So it gets short passages with the facts already settled. It never gets the last word on a number.

What do you need?

  • A draft. The steps assume Claude Code wrote it from your notes.
  • Access to Hemmingway-1: the free browser demo, the makers’ app or API, a local copy, or the Hemmingway writing skill in StashBase.
  • The sources the draft has to agree with, open next to the text.

The five steps

(4) Draft with Claude, from your material.

Give it your notes, your sources and a brief: who the article is for, and what you think. Ask for the outline first and argue with it.

Read the notes and sources in this folder. Propose an outline for an article
for [reader] that argues [your view]. Wait for my comments before drafting.

In StashBase, choose Claude Code in the agent picker and type @ to point it at the folder. The draft is saved as a Markdown file in your folder. Every agent in StashBase opens the same folders, so you copy nothing between chat windows.

(5) Mark the passages that need a person.

Do not send the whole article. Mark the places where a reader judges the voice:

  • the first paragraph
  • the last paragraph
  • any sentence where you give an opinion
  • anything that travels alone: the email, the post that links to the piece

Leave definitions, steps and tables alone. Plain and correct is what they need, and Claude already wrote them that way.

(6) Hand each passage to Hemmingway, with the facts pinned.

One passage at a time. Say who the reader is, what must not change, and that you want one version.

Rewrite this paragraph so it sounds like a person wrote it. It opens an
article for [reader]. Keep every number, name and date exactly as written.
Do not add facts. Give me one version, only the text.

[paragraph]

To get closer to your own voice, add two or three paragraphs you wrote and say “match this.”

In StashBase, ask the agent for the rewrite and it writes with Hemmingway-1 through StashBase’s hosted gateway. You sign in to StashBase and need no Hemmingway account. See how to choose an agent.

(7) Check the rewrite against the draft.

Put the two versions side by side. Read for meaning before you read for sound.

  • Every number, name and date is unchanged.
  • Nothing was added. A fluent model will sometimes supply a detail that was never in your notes.
  • A cautious claim is still cautious. “We did not measure time saved” must not become “it saved time.”
  • It still sounds like the rest of the article. If the new opening is warmer than everything after it, tone it down.

In StashBase, agent file edits show in the Chat for review, and the sources are open beside the draft.

(8) Do the last read yourself.

Read the piece aloud. Change anything you would not say.

If one habit keeps coming back, such as a group of three in every paragraph, a rule-based pass with Humanizer catches it quickly. AI Humanizer or a Better Model explains how the two fit together.

What if you do not use StashBase?

The split still works.

Draft in Claude. Paste a passage into the Hemmingway-1 demo or the makers’ app. Paste the result back.

The cost is the copying, and keeping track of which version of a paragraph is current. That bookkeeping is the reason to keep the draft as one file that both tools work on.