codex-gpt-5-4

gpt-5-4

Speciation Isle

Speciation Isle is a single-file Three.js artificial-life island. It generates a seeded terrain, plant and shoreline resources, and founder populations for three ecological roles:

Mossbacks: plant grazers that deplete forage and flee predators.
Nightstalkers: nocturnal hunters that gain sensor and movement advantages after dark.
Tidepickers: shoreline scavengers that eat carrion, feed on algae, and fertilize visited cells.

Each organism has inherited genes for size, speed, sensor range, efficiency, fertility, armor, aggression, nocturnal preference, shore affinity, and color drift. Reproduction copies the parent genome with mutation, and those genes change the creature's visible body scale, leg length, antenna length, shell or horn size, fins, bill length, and color tint.

Run

Open index.html directly in a desktop browser.

If the browser blocks module imports from a local file, serve the directory with:

python3 -m http.server 8080

Then open http://127.0.0.1:8080/.

Controls

Drag to orbit the camera.
Scroll to zoom.
Click an organism to inspect its state and genome.
Use the speed slider to pause, slow down, or accelerate.
Use the seed field, reset button, or New island button to reproduce or randomize a run.

Outcome

status

submitted

score

—

verdict

Commits a browser-playable HTML simulation directly in the solution folder and mirrors it under docs/artifacts for one-click results site evaluation.

Stack

htmlcssjavascriptthreejswebglartificial-life

notes

Open `life-sim/codex-gpt-5-4/index.html` directly in a browser, serve the folder with `python3 -m http.server 8080` if local module loading is blocked, or use the mirrored artifact at `./artifacts/life-sim/codex-gpt-5-4.html`.

Other solutions for this eval

3 total

codex-gpt-5-5-xhighSingle-file Three.js artificial-life atoll with deterministic seeded terrain, meadow and shoreline resources, three interacting ecological roles, local sensing and decision rules, predation, grazing, carrion scavenging, nutrient feedback, sexual crossover reproduction, mutable inherited genomes, visible body-plan drift, day/night behavior changes, organism inspection, and live population/trait/event charts.

htmlOpen

claude-code-opus-4-7-maxSingle-file Three.js life sim. Seeded Perlin-noise island with meadow / forest / rock / sand / snow biomes, a custom-shader sky that crossfades dawn → noon → dusk → night with stars, and a wavy water shader that tints by night. Three roles (Leafers, Stalkers, Tide Sprites) act via a sensing-based FSM (wander / forage / flee / pursue / mate / rest) over a spatial hash. Each organism carries an 8-gene genome (size, speed, sense, metabolism, armor, aggression, fertility, nocturnal) that drives both behavior weights and visible body (scaled limbs, head, ears, fins, tail, spines, tint). Reproduction is uniform-crossover + gaussian mutation; no fitness function is imposed. Night gives Stalkers up to +60% sense range and +20% speed, so the nocturnal gene becomes a real selection knob. HUD includes population / births-vs-deaths / per-species trait-drift / generation-depth charts, click-to-inspect, event log, and an in-app 'How it works' explainer. Speed slider + presets + keyboard shortcuts.

htmlOpen

cursor-fable-5-thinking-highSingle-file Three.js island ecology ('Isla Genesis') with seeded fractal terrain, daylight-gated plant regrowth, tide-fed shoreline carrion, and three interacting roles — grazers, stamina-limited ambush predators, and amphibious scavengers that escape into the shallows. Seven heritable genes with crossover and mutation shape visible bodies and behavior; day/night drives activity, vision and sleep vulnerability. Includes organism inspector, speed slider, population/trait-drift charts and a mutant/extinction event log.

htmlOpen