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Sim

Fluid

Fluid — WebGL fluid simulation with swirling particles.

CategorySim
Models tested23
Scored18/23
Avg score7.76/10
WinnerGLM-5.2

What I asked each model — the Fluid prompt

Every model on this page got this exact prompt inside the Agent Operating System: Fluid — WebGL fluid simulation with swirling particles.

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 K2.7, Kimi K3, MiniMax M3, Hermes MoA, Opus 4.8, Claude Opus 5, Qwen 3.8, Qwen 3.7, Claude Sonnet 5, DeepSeek V4 Pro, DeepSeek V4 Flash, Kimi K2.7 · Fast, Kimi K2.7 · No-Think, Kimi K2.7 · Quality.

Why this task matters. Fluid is a textbook test of sim-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 Fluid

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
• 8.3/10

What I saw: Renders beautifully with elegant curl-noise flow lines and a lovely cyan-to-magenta speed-based gradient, plus autopilot vortex and clean pointer interaction. Strong and shippable, but it's more a flow-field particle field than a true fluid sim with density diffusion, so it falls just short of topping the best.

▶ Play Claude Fable 5's attempt →
Fugu Ultra Sakana AI
• 6.5/10

What I saw: Ultra v2 — fluid sim. Smoke-test MAYBE (0.0% diff) — needs click-drag injection which generic input didn't replicate.

▶ Play Fugu Ultra's attempt →
Fugu Mini Sakana AI
• 8.0/10

What I saw: 2D fluid simulation, click-drag density+velocity. Smoke-test PASS.

▶ Play Fugu Mini's attempt →
Fusion OpenRouter
• 8.5/10

What I saw: Stable-fluids style 2D simulation with click-and-drag density+velocity injection. Polished glass HUD, gradient title, live pill indicator, right-side controls panel. Touch-action set so it works on mobile. Visually on par with Opus's blob-in-bowl.

▶ Play Fusion's attempt →
• 7.8/10

What I saw: Strong particle density (75k) with glowing additive blending, polished glassmorphism UI, presets and shockwave controls all render cleanly; but the center is blown out to solid white and it reads more as a bright particle cloud than an elegant swirling fluid, keeping it just short of the field's best.

▶ Play Gemini 3.6 Flash's attempt →
GLM-5.2 Zhipu / Z.ai
🥇 9.0/10 · winner · best liquid

What I saw: GLM filled the bowl with glowing liquid that actually sloshes — the most convincing 'liquid in a bowl'. Opus's particles glowed but clumped to the centre. Kimi's collapsed into a tiny blob.

▶ Play GLM-5.2's attempt →
GPT-5.6 Sol OpenAI
🥉 8.6/10 · swirling vortex flow

What I saw: Gorgeous swirling vortex of multicolored particle trails around a glowing core — the cyan/violet/pink palette, additive-blended trails, and clean UI chrome (title, metrics, custom cursor) make it genuinely polished and clearly on-brief. Not a literal Navier-Stokes fluid sim but the flow-field aesthetic reads as fluid convincingly, and the composition tops the field.

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

What I saw: A round bowl of ~500 distinct glowing droplets that fall, pool at the bottom and slosh when you tilt with the mouse, with colour themes. The first version melted into one white blob; this one keeps every droplet separate, like real liquid.

▶ Play Grok's attempt →
Inkling Thinking Machines
• 6.8/10

What I saw: Renders cleanly with a polished Orbitron title and a dense particle cloud with pleasing color mix, but it reads as a scattered particle sphere rather than convincing swirling fluid motion — the flow field is subtle and the CPU per-particle loop limits it to a generic point cloud rather than the cohesive vortex the brief implies.

▶ Play Inkling's attempt →
Kimi K2.7 Moonshot AI
• 5.0/10

What I saw: GLM filled the bowl with glowing liquid that actually sloshes — the most convincing 'liquid in a bowl'. Opus's particles glowed but clumped to the centre. Kimi's collapsed into a tiny blob.

▶ Play Kimi K2.7's attempt →

The winner on Fluid

GLM-5.2 took gold on this task. winner · best liquid.

What I saw: GLM filled the bowl with glowing liquid that actually sloshes — the most convincing 'liquid in a bowl'. Opus's particles glowed but clumped to the centre. Kimi's collapsed into a tiny blob.

See GLM-5.2's full model card: /models/glm.

Every attempt — live, playable

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

Claude Fable 5 on Fluid▶ LIVE
Claude Fable 5
Anthropic
Renders beautifully with elegant curl-noise flow lines and a lovely cyan-to-magenta speed-based gradient, plus autopilot vortex and clean pointer interaction. Strong and shippable, but it's more a flow-field particle field than a true fluid sim with density diffusion, so it falls just short of topping the best.
Fugu Ultra on Fluid▶ LIVE
Fugu Ultra
Sakana AI
Ultra v2 — fluid sim. Smoke-test MAYBE (0.0% diff) — needs click-drag injection which generic input didn't replicate.
Fugu Mini on Fluid▶ LIVE
Fugu Mini
Sakana AI
2D fluid simulation, click-drag density+velocity. Smoke-test PASS.
Fusion on Fluid▶ LIVE
Fusion
OpenRouter
Stable-fluids style 2D simulation with click-and-drag density+velocity injection. Polished glass HUD, gradient title, live pill indicator, right-side controls panel. Touch-action set so it works on mobile. Visually on par with Opus's blob-in-bowl.
Gemini 3.6 Flash on Fluid▶ LIVE
Gemini 3.6 Flash
Google
Strong particle density (75k) with glowing additive blending, polished glassmorphism UI, presets and shockwave controls all render cleanly; but the center is blown out to solid white and it reads more as a bright particle cloud than an elegant swirling fluid, keeping it just short of the field's best.
GLM-5.2 on Fluid▶ LIVE
GLM-5.2 🥇
Zhipu / Z.ai
GLM filled the bowl with glowing liquid that actually sloshes — the most convincing 'liquid in a bowl'. Opus's particles glowed but clumped to the centre. Kimi's collapsed into a tiny blob.
GPT-5.6 Sol on Fluid▶ LIVE
GPT-5.6 Sol 🥉
OpenAI
Gorgeous swirling vortex of multicolored particle trails around a glowing core — the cyan/violet/pink palette, additive-blended trails, and clean UI chrome (title, metrics, custom cursor) make it genuinely polished and clearly on-brief. Not a literal Navier-Stokes fluid sim but the flow-field aesthetic reads as fluid convincingly, and the composition tops the field.
Grok on Fluid▶ LIVE
Grok
xAI
A round bowl of ~500 distinct glowing droplets that fall, pool at the bottom and slosh when you tilt with the mouse, with colour themes. The first version melted into one white blob; this one keeps every droplet separate, like real liquid.
Inkling on Fluid▶ LIVE
Inkling
Thinking Machines
Renders cleanly with a polished Orbitron title and a dense particle cloud with pleasing color mix, but it reads as a scattered particle sphere rather than convincing swirling fluid motion — the flow field is subtle and the CPU per-particle loop limits it to a generic point cloud rather than the cohesive vortex the brief implies.
Kimi K2.7 on Fluid▶ LIVE
Kimi K2.7
Moonshot AI
GLM filled the bowl with glowing liquid that actually sloshes — the most convincing 'liquid in a bowl'. Opus's particles glowed but clumped to the centre. Kimi's collapsed into a tiny blob.
Kimi K3 on Fluid▶ LIVE
Kimi K3 🥇
Moonshot AI
Gorgeous, textbook-quality WebGL fluid sim with rich swirling dye, added particle sparkle, and polished UI (gradient title, hint pill, control buttons) — the vorticity/pressure-solve pipeline and half-float fallback handling are all correct and shippable; only minor knock is the visual is close to the well-known Pavel Dobryakov reference.
MiniMax M3 on Fluid▶ LIVE
MiniMax M3
MiniMax
2D fluid sim with click-drag injection.
Hermes MoA on Fluid▶ LIVE
Hermes MoA
Hermes · Mixture of Agents
A polished WebGL flow-field with layered vortices, fbm-warped background and additive glowing particles that stir convincingly on drag/tap/Space — visually richer than Opus's clumping particles and well above the generic field, but it's an artistic flow visualizer rather than a real fluid sim like Fusion's stable-fluids build, and it doesn't deliver the convincing 'liquid in a bowl' sloshing that won GLM-5.2 the task. Strong and shippable, just not best-in-field.
Opus 4.8 on Fluid▶ LIVE
Opus 4.8
Anthropic
GLM filled the bowl with glowing liquid that actually sloshes — the most convincing 'liquid in a bowl'. Opus's particles glowed but clumped to the centre. Kimi's collapsed into a tiny blob.
Claude Opus 5 on Fluid▶ LIVE
Claude Opus 5
Anthropic
Strong curl-noise flow with 20k additive particles forming coherent swirling filaments, clean gradient title and full control set (reset/palette/swirl, drag-to-stir). The screenshot reads slightly sparse/dark in the center rather than a dense fluid-like continuum, keeping it just below the top tier.
Qwen 3.8 on Fluid▶ LIVE
Qwen 3.8
Alibaba
Gorgeous glowing galactic swirl with a molten pulsing core, rich teal/magenta/plum palette and convincing spiral-arm structure driven by curl noise plus interactive mouse stirring; polished and clearly on-brief, though the blown-out white center slightly overwhelms the fluid detail and it reads more nebula than true fluid, keeping it just under the top.
Qwen 3.7 on Fluid▶ LIVE
Qwen 3.7
Alibaba
GLM filled the bowl with glowing liquid that genuinely sloshes — the most convincing of the three. Opus's particles glowed but clumped to the centre, and Qwen's is a solid working sim but reads thinner. Play them and tilt — GLM's is the one that feels like fluid.
Claude Sonnet 5 on Fluid▶ LIVE
Claude Sonnet 5 🥉
Anthropic
Stunning rendered flow-field with rich swirling particle streaks, a clear vortex focal point, and vivid rainbow color mapping over additive-blended trails — genuinely beautiful and clearly on-brief. Only knock is the low 22fps and it's a flow-field trail sim rather than true fluid dynamics, but visually it tops the field.
DeepSeek V4 Pro on Fluid▶ LIVE
DeepSeek V4 Pro
DeepSeek
DeepSeek V4 Flash on Fluid▶ LIVE
DeepSeek V4 Flash
DeepSeek
Kimi K2.7 · Fast on Fluid▶ LIVE
Kimi K2.7 · Fast
Moonshot AI
Kimi K2.7 · No-Think on Fluid▶ LIVE
Kimi K2.7 · No-Think
Moonshot AI
Kimi K2.7 · Quality on Fluid▶ LIVE
Kimi K2.7 · Quality
Moonshot AI

How I scored Fluid — 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.

Related

More sim benchmarks: all tasks in the Sim category · See the best AI model for Fluid · Back to the leaderboard

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