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Visual

Terrain

Terrain — procedural 3D terrain explorer.

CategoryVisual
Models tested23
Scored17/23
Avg score7.48/10
WinnerFugu Mini

What I asked each model — the Terrain prompt

Every model on this page got this exact prompt inside the Agent Operating System: Terrain — procedural 3D terrain explorer.

Single HTML file out. No iteration. No examples in the system prompt. Whatever each model produced on the first run is what's on this page. 23 frontier models have attempted it so far: Claude Fable 5, Fugu Ultra, Fugu Mini, Fusion, Gemini 3.6 Flash, GLM-5.2, GPT-5.6 Sol, Grok, Inkling, Kimi K3, MiniMax M3, Hermes MoA, Opus 4.8, Claude Opus 5, Qwen 3.8, Qwen 3.7, Claude Sonnet 5, Kimi K2.7 · Fast, Kimi K2.7 · No-Think, Kimi K2.7 · Quality, DeepSeek V4 Pro, DeepSeek V4 Flash, Kimi K2.7.

Why this task matters. Terrain is a textbook test of visual-class capability — the kind of build that exposes whether a model is doing pattern-matching or actual reasoning. Shipping this cleanly is the floor for what I expect from a frontier model — every model on the leaderboard should at least attempt it.

How each model handled Terrain

Ranked by my 0–10 score from the source comparison guides on agentos.guide. Click any to play the actual one-shot HTML the model produced.

Claude Fable 5 Anthropic
• 7.8/10

What I saw: Renders a convincing infinite terrain with snowy peaks, sandy slopes and grassy valleys, plus solid chunked LOD, auto-fly and full drag/keyboard/pinch controls; the vivid green splotches read as a bit unnatural against the tan and the sky is empty/flat, keeping it just short of the top tier.

▶ Play Claude Fable 5's attempt →
Fugu Ultra Sakana AI
• 8.0/10

What I saw: Ultra v2 — Tron procedural terrain. Smoke-test PASS.

▶ Play Fugu Ultra's attempt →
Fugu Mini Sakana AI
🥇 8.5/10

What I saw: Mini gap-fill (round 2) — Tron procedural terrain. Smoke-test PASS (8.6% diff — strong motion).

▶ Play Fugu Mini's attempt →
Fusion OpenRouter
• 8.0/10

What I saw: Tron-style procedural terrain flythrough with three.js + bloom. Glowing grid mountains, retro horizon. Drag to steer.

▶ Play Fusion's attempt →
🥈 8.4/10 · biome terrain explorer

What I saw: Strong low-poly terrain with convincing biome coloring (green slopes, sandy shores, snow peaks, blue water), tree instances, stars and polished glassmorphism UI with 5 biome presets plus auto-roam/regenerate; falls just short of the top only for a somewhat flat lighting and generic navigation feel.

▶ Play Gemini 3.6 Flash's attempt →
GLM-5.2 Zhipu / Z.ai
• 7.0/10

What I saw: 13KB · plays clean · plain

▶ Play GLM-5.2's attempt →
GPT-5.6 Sol OpenAI
• 7.4/10

What I saw: Renders a clean stylized low-poly terrain with trees, biome/relief/sun controls, seed, compass and cruise mode — a solid, polished procedural explorer. But the scene reads flat and washed out with heavy fog obscuring the relief, so it lacks the dramatic elevation and depth of a top build.

▶ Play GPT-5.6 Sol's attempt →
Grok xAI
• 7.5/10

What I saw: Tron procedural terrain flythrough with glowing grid mountains. Drag to steer. 18KB.

▶ Play Grok's attempt →
Inkling Thinking Machines
• 5.5/10

What I saw: Renders and is clearly 3D terrain with orbit controls and decorative boxes, but the camera is zoomed too close and the washed-out pale-blue coloring reads as an overexposed ice blob rather than a legible landscape; per-vertex re-computation every frame is also costly. Strong plumbing, weak final visual composition.

▶ Play Inkling's attempt →
Kimi K3 Moonshot AI
• 4.5/10

What I saw: Strong scaffolding — nice sky gradient, water, clouds, sand beaches, instanced trees, and clean UI — but the terrain interior renders almost entirely black, indicating a broken lighting/normals or vertex-color issue that dominates the screenshot. The visible flaw undercuts an otherwise polished procedural island explorer.

▶ Play Kimi K3's attempt →

The winner on Terrain

Fugu Mini took gold on this task.

What I saw: Mini gap-fill (round 2) — Tron procedural terrain. Smoke-test PASS (8.6% diff — strong motion).

See Fugu Mini's full model card: /models/fugumini. Direct head-to-head against the runner-up: Fugu Mini vs Gemini 3.6 Flash.

Every attempt — live, playable

Side by side. Click any tile to run that model's actual one-shot HTML in a new tab.

How I scored Terrain — methodology

Three axes, 0–10 each, averaged. Runs: drop the .html in a browser; if it opens to a broken page, it scores zero. Hits the brief: did the model ship the thing the prompt asked for, or a different thing it found easier. Looks good: visual polish, motion, interactivity — where most of the gap between gold and silver lives.

My scores trace back to the source comparison guides on agentos.guide. See the full methodology page for data provenance, including which source guide each cell's score came from.

The same stack Julian uses

Run this stack yourself.

Every demo on this bench was built inside the Agent Operating System — one prompt, one shot, single HTML file out. The Agent OS, the prompts, the templates, the weekly walkthroughs and 4,000+ founders shipping with it every day all live inside the AI Profit Boardroom.

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