Same Prompt

Four AI coding agents, the exact same prompt, one HTML file each. Every page is the file the agent wrote, unedited. Prompts, rules and run facts are in the README.

Black Hole

Claude (Fable 5.1)built in 6:28Codex (GPT-6.1 Sol)built in 2:30Gemini (4 Argon)built in 2:40Grok (4.7)built in 26:08

100 Double Pendulums

Claude (Fable 5.1)built in 1:12Codex (GPT-6.1 Sol)built in 1:25Gemini (4 Argon)built in 1:08Grok (4.7)built in 13:18

Galaxy Collision

Claude (Fable 5.1)built in 4:53Codex (GPT-6.1 Sol)built in 1:32Gemini (4 Argon)built in 4:12Grok (4.7)built in 24:53

Cherry Blossom Tree

Claude (Fable 5.1)built in 10:23Codex (GPT-6.1 Sol)built in 2:46Gemini (4 Argon)built in 3:56Grok (4.7)built in 24:25

Lighthouse in a Storm

Claude (Fable 5.1)built in 7:00Codex (GPT-6.1 Sol)built in 3:21Gemini (4 Argon)built in 4:53Grok (4.7)built in 24:12

Fireworks Over a City

Claude (Fable 5.1)built in 5:06Codex (GPT-6.1 Sol)built in 1:52Gemini (4 Argon)built in 3:42Grok (4.7)built in 29:17

Coral Reef Aquarium

Claude (Fable 5.1)built in 4:35Codex (GPT-6.1 Sol)built in 2:36Gemini (4 Argon)built in 3:56Grok (4.7)built in 21:36

Volcano Eruption

Claude (Fable 5.1)built in 4:13Codex (GPT-6.1 Sol)built in 2:37Gemini (4 Argon)built in 4:16Grok (4.7)built in 14:43

Solar System

Claude (Fable 5.1)built in 2:02Codex (GPT-6.1 Sol)built in 2:16Gemini (4 Argon)built in 3:50Grok (4.7)built in 28:12

Rubik's Cube Solving Itself

Claude (Fable 5.1)built in 3:39Codex (GPT-6.1 Sol)built in 1:49Gemini (4 Argon)built in 3:00Grok (4.7)built in 24:01

Starling Murmuration

Claude (Fable 5.1)built in 3:29Codex (GPT-6.1 Sol)built in 2:02Gemini (4 Argon)built in 3:02Grok (4.7)built in 18:47

Synthwave Drive

Claude (Fable 5.1)built in 2:19Codex (GPT-6.1 Sol)built in 1:51Gemini (4 Argon)built in 3:08Grok (4.7)built in 10:41

Lava Lamp

Claude (Fable 5.1)built in 2:11Codex (GPT-6.1 Sol)built in 1:39Gemini (4 Argon)built in 3:18Grok (4.7)built in 21:34

Domino Chain Reaction

Claude (Fable 5.1)built in 4:00Codex (GPT-6.1 Sol)built in 2:03Gemini (4 Argon)built in 2:25Grok (4.7)built in 26:04

Northern Lights

Claude (Fable 5.1)built in 3:47Codex (GPT-6.1 Sol)built in 2:27Gemini (4 Argon)built in 2:27Grok (4.7)built in 12:21