Book blurb prompt
A copy-and-paste prompt for ChatGPT, Claude or Gemini that gets a professional book blurb on the first try, plus the cheapest model that does it well.
What most people type
back cover blurb for my cozy mystery novel about a retired teacher solving crimes in a small vermont town
It works, but the AI has to guess your protagonist name and trait, central mystery and town name and details, so the first answer usually needs another round. The version below asks for exactly what a professional would deliver.
The better prompt
Write a back cover blurb for my cozy mystery novel about a retired teacher who solves crimes in a small Vermont town. Details to work from: - Protagonist: [name and one defining trait] - Central crime or hook in this book: [the mystery] - Town name and setting details: [town name, a few specifics] - Tone: [e.g., warm and witty, gentle humor] - Series info or comparable authors (optional): [series title / comp authors] - Author bio or review quote (optional): [quote] Structure it the way a published cozy mystery blurb works: a hook line, a short setup that introduces the protagonist and the town, the inciting crime and the stakes, and a closing line or question that makes readers want to open the book. Don't reveal the culprit or the ending. Keep the tone inviting and cozy, with no graphic violence. Give me one main version of about 120-150 words, plus 3 alternative hook lines to choose from. Don't invent plot points beyond what I've given; use the placeholders where details are missing.
Replace the [brackets] with your details before you send it: name and one defining trait, the mystery, town name, a few specifics, e.g., warm and witty, gentle humor, series title / comp authors, quote.
Why this version works
- Added placeholders for plot, name, tone. A blurb needs specifics the writer didn't give.
- Specified blurb structure. Matches how published cozy mystery blurbs are built.
- Set length and alternative hooks. Blurbs have a natural size; options help choosing.
- Banned inventing plot points and spoilers. Keeps the blurb faithful to the actual book.
What a professional book blurb prompt covers
- Blurb length around 150 words
- Hook and stakes
- Placeholders for title and character names
Best AI model for this prompt
This is a everyday task: short creative copy needing solid writing skill, but nothing multi-step or technical. You don't need the most expensive model. The cheapest model at each company that handles it well:
| Company | Model | Per use | Per 1,000 uses |
|---|---|---|---|
| Anthropic | Claude Sonnet 5.5 | $0.0034 | $3.44 |
| OpenAI | GPT-6.1 Terra | $0.0017 | $1.72 |
| Gemini 3.8 Flashcheapest | $0.0013 | $1.29 |
Pay-per-use list prices for this prompt and its expected answer (about 300 tokens). On a monthly chat plan, the same choice shows up as more messages before you hit your limit. See today's AI prices.