Best AI Prompts for Long-Form Writing (2026)

Prompts for long-form writing#

Act as a speechwriter and editor. Using only the notes below, draft a [WORD COUNT]-word [ESSAY, KEYNOTE OR LONG ARTICLE] for [DESCRIBE YOUR READER OR AUDIENCE], with one main argument, a clear opening, and a close that tells the reader what to do or think next. Mark any claim the notes do not support with [NEEDS SOURCE] instead of filling it in. Notes: [PASTE YOUR NOTES AND SOURCES]

Act as a structural editor. Read the draft below and write a reverse outline: one line per paragraph saying what it does. Then list paragraphs that repeat another, sit in the wrong order, or do not support the main point, and propose a new order. Do not rewrite any sentences yet. Draft: [PASTE YOUR DRAFT]

Act as a line editor. Rewrite the draft below for [DESCRIBE YOUR READER], using active voice, concrete verbs instead of nouns like "make a decision", and shorter sentences where the meaning allows. Keep my facts, quotes, names and numbers unchanged, and show each change in a before-and-after list so I can reject any of them. Draft: [PASTE YOUR DRAFT]

Act as a developmental editor for a [NOVEL, MEMOIR OR NONFICTION BOOK]. Read the excerpt below and tell me where the structure, point of view, character or narrator voice, and pacing break down, with the paragraph where each problem starts. Give me questions to answer and examples of fixes, but do not rewrite the passage. Excerpt: [PASTE YOUR MANUSCRIPT EXCERPT]

Act as my writing partner. Study the three samples of my writing in the tags below and describe my voice in five points (sentence length, word choice, how I open and close, what I avoid). Then rewrite the passage after the samples in that voice, changing nothing about the facts. <samples> [PASTE 3 SAMPLES OF YOUR OWN WRITING] </samples> Passage: [PASTE THE PASSAGE TO REWRITE]

What to add to any long-form writing prompt#

• Your material, before the instruction. Anthropic says to put long documents near the top of the prompt and the query after them, and Google says the same for large context. Both put the question last.
• The reader and the job of the piece. Plain language guidance from Digital.gov starts from writing for a specific audience. Say who reads it and what they should do afterwards.
• Two or three samples of your own writing. Anthropic calls examples one of the most reliable ways to steer tone and structure and suggests 3 to 5 that are relevant and varied. Wrap them in <example> tags so they are not read as instructions.
• One revision pass per prompt. Google says different phrasing and a changed prompt order give different responses, so iterate with a narrow request. Our analysis: structure, then voice, then sentences keeps each pass checkable.
• What must not change. Name quotes, figures, names and your thesis. Anthropic says to be specific about the output you want, and Google says constraints can limit how the model writes.
• A format request in positive terms. Anthropic suggests "write in smoothly flowing prose paragraphs" over "do not use markdown", and says prompt style can influence output style.

A worked example#

Act as a line editor. Rewrite the draft below for city council staff who read it on a phone between meetings, using active voice, concrete verbs instead of nouns like "make a decision", and shorter sentences where the meaning allows. Keep my facts, quotes, names and numbers unchanged, and show each change in a before-and-after list so I can reject any of them.

Draft:
(1,400 words of my memo on the proposed bike-lane budget, pasted here, including the two quotes from the transportation director and the cost table)

A good result for this task:

• Leaves every quote, figure, name and date exactly as you wrote it.
• Lists each change, so you can accept or reject it, instead of returning only a polished block.
• Keeps your argument and order; if it wants to move paragraphs, it says so instead of doing it.
• Fixes sentences you can point to (passive actors, buried verbs) rather than adding generic flourish.
• Does not add facts, examples or citations that were not in your draft.

The full prompt library is on our prompt library page.

Limits of this guide#

The vendor guides explain how to ask, not what makes prose good, and none of them tests editing prompts for long manuscripts. Digital.gov covers plain, public-facing writing; its rules fit memos and reports better than fiction or personal essays. We did not test these prompts or measure how well any model preserves a writer's voice. Output quality across very long documents varies by model and context size, which we could not confirm.