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Pencil in a Glass of Water

Three models render a pencil standing at an angle in a glass of water - testing whether they understand light physics well enough to displace the submerged part at the waterline, without ever being told to.

6 models compared · same input · same prompt

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Input & prompt

Prompt template

A photorealistic close-up of a single yellow wooden pencil resting inside a clear drinking glass filled with water, the pencil leaning diagonally against the rim with its pink eraser end pointing up out of the water. The glass sits on a wooden kitchen table with a softly blurred background and bright natural window light. Sharp focus on the glass, shallow depth of field.

ChatGPT (GPT Image 2)

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openai/gpt-image-2

Nano Banana 2 (Gemini)

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google/nano-banana-2

Qwen Image 2.0 Pro

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alibaba/qwen-image-2-0-pro

Seedream 5 Lite

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bytedance/seedream-5-0-lite

Flux Kontext Pro

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flux/kontext-pro/text-to-image

Grok Imagine Pro

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