Prompt & Done · FLAPPY pack

Same prompt, three AIs

Claude Opus 5.5, GPT-6.1 Sol and Qwen 3.5 (free, running on a laptop) got the same one-line prompt. Here are all three games exactly as they wrote them, the prompt, and all three rounds.

1 Play all three games

Round 1, unedited. Claude's and GPT's open in demo mode: the bird flies itself until you press a key. Qwen's opens on a start screen: press START DEMO MODE and watch.

Claude Opus 5.5's gameBuilt in 1:18 · 26¢GPT-6.1 Sol's gameBuilt in 8:33 · 37¢Qwen 3.5's game (free, local)Built in 7:37 · $0 · the one that ends before you blink

2 The exact prompt

Paste it into Claude Code, Codex or any AI that writes code, then open the file in a browser.

Make a playable Flappy Bird-style game in a single index.html file. Include a demo mode where the bird flies itself until a key is pressed.

3 All three rounds

Round	Claude Opus 5.5	GPT-6.1 Sol	Qwen 3.5 (local)
1	1:18 · 26¢ ✓	8:33 · 37¢ ✓	7:37 · $0 ✗ bird lasts 0.3 s
2	1:34 · 41¢ ✓	7:51 · 33¢ ✓	3:03 · $0 ✗ no file
3	1:33 · 43¢ ✓	5:14 · 24¢ ✓	7:47 · $0 ✗ crashes on load

Claude finished first every round; GPT was cheaper in rounds 2 and 3; the free model never produced a working game. Claude Code 2.1.296 and Codex CLI 0.162.1 (effort high); Qwen3.5-9B (Q4, Apache-2.0) in Ollama 0.35.0 via Codex, on an M4 Pro MacBook. Tested 11 Oct 2026. Costs are API-equivalent at list prices (both paid tools ran on subscriptions): OpenAI pricing · Qwen3.5-9B.