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Fable 5.1 vs Fable 5.2: All 7 prompts to run on both

The 7 one-shot build prompts from the Fable 5.1 vs Fable 5.2 rematch, word for word, how to run them fairly on both models, and the full bill for each build.

What’s inside

  1. 11. How to run both, fairly
  2. 22. The full bill
  3. 33. What each one built
  4. 44. The 7 prompts
  5. 55. When something does not work

1. How to run both, fairly

  1. One empty folder per run. Each model starts from nothing, so neither sees the other's work.
  2. Pick the model. /model claude-fable-5-1 for the old one. /model fable for Fable 5.2.
  3. Set the same effort on both. Type /effort high. That is what both sides of this test used.
  4. Paste the prompt once. No follow-ups. One shot is the whole test. Then open both index.html files in Chrome side by side.

2. The full bill

Same prompt, one shot each, no fixes. These are the costs Claude Code reports at API prices. On a Pro or Max plan you pay your plan instead.

Build

Fable 5.1

Fable 5.2

5.1 time

5.2 time

Black hole

$3.53

$2.78

7.0 min

8.2 min

Robot arms + Rubik's cube

$9.60

$7.25

23.6 min

27.7 min

3D cover shooter

$4.92

$5.32

9.8 min

14.8 min

Smart speaker

$2.39

$4.51

3.9 min

13.6 min

Shoe configurator

$5.53

$6.60

13.1 min

not published

Live sales globe

$2.72

$3.40

4.5 min

not published

Retro shooter

$7.02

$9.43

20.5 min

not published

All 7

$35.71

$39.29

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Bold marks the cheaper side. Fable 5.2 build times were only published for the first four builds.

That’s the first part. The rest of this guide is free too.

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