Prompt: 4 ways to use Claude Fable 5.2

⚙️ How to use these prompts

1. Open Claude and pick Fable 5.2 in the model menu. In Claude Code, type /model and pick Fable 5.2.
2. Copy the prompt you want and replace what is between < >.
3. Send it. For the app and review prompts, let it work: it can take several minutes.

1. A full app, from plan to test

Use it in Claude Code, in an empty folder.

I want a <household expense tracker> app that works in the phone browser, keeps the data on the device itself and shows a chart per month.

Before writing code, make a step-by-step plan and a checklist. Then work on your own until the end: write, test each part and fix what fails. Only call me if you need a decision from me.

At the end, tell me how to open the app and what was left out.

2. A vague request that becomes a ready spreadsheet

Use it in Claude, in the browser or the app.

I want to organize <my personal finances>, but I don't know where to start.

Ask me up to 5 questions, one at a time, and wait for each answer. Then build a spreadsheet with the tabs that make sense for my case, with formulas already in place and a summary on the first tab. Give me the file ready to open in Excel or Google Sheets.

3. A review of your project before you touch it

Use it in Claude Code, inside the project folder.

Read this whole project and give me the 5 most serious problems you find: bug, security flaw or slowness.

For each one: the file and the line, why it is serious in one sentence, and the fix you would make.

Don't change any file yet. Wait for me to choose which ones to fix.

4. A study plan that corrects you

Use it in Claude, in the browser or the app.

Teach me <the subject> as if I were 12 years old, in 7 days, 20 minutes a day.

For each day: a short explanation, an exercise and a question for me to answer. Show only day 1. When I answer, correct my answer and only then move on to the next day.

What changed in Fable 5.2

• It came out on November 9, 2026, together with Mythos 5.2. Anthropic's announcement.
• Anthropic says it answers up to 30% faster than Fable 5.1.
• Through the API, it costs US$ 8 per million input tokens and US$ 40 per million output tokens. Fable 5.1 cost US$ 10 and US$ 50. Documentation.
• In the announcement, an Anthropic engineer says he left the model working nonstop for eight days, with over a thousand agents, and it produced an operating system that boots on a laptop. Video of the system.