Prompt & Done · ARCADE pack
Same prompt, two Claudes
Claude Haiku 5.5 and Claude Opus 5.5 got the same one-line prompt in Claude Code. Here are both games exactly as they wrote them, the prompt, and all three races.
1 Play both games
Each opens in demo mode: the paddle plays itself until you press a key (or move on the screen).
2 The exact prompt
Paste it into Claude Code (or any AI that writes code) and open the file in a browser.
Make a playable neon Breakout game in a single index.html file. Include a demo mode where the paddle plays itself until a key is pressed.
3 All three races
| Race | Opus time | Haiku time | Opus cost | Haiku cost |
|---|---|---|---|---|
| 1 | 1:17 | 2:48 | $0.39 | $0.03 |
| 2 | 2:46 | 3:38 | $0.68 | $0.04 |
| 3 | 1:44 | 1:48 | $0.46 | $0.02 |
Opus finished first every time; Haiku cost under a tenth every time. Claude Code CLI 2.1.296, headless, 10 Oct 2026. Costs are API-equivalent, as reported by Claude Code. Model details: Anthropic: Claude Haiku 5.5 · Claude pricing.