STEALTHMARK · HEAD TO HEAD

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Gemma 4 26B A4B vs GPT-6 Astra

GPT-6 Astra scores 50.0 points higher overall (70.5 vs 20.5). GPT-6 Astra scores higher on Newton's Mirror, with its largest category advantage in reflections.

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All results ↗

Overall StealthMark

20.5/100
70.5/100

General Intelligence

12.2/100
64.0/100

Visual Intelligence

30.5/100
78.2/100

Newton's Mirror

Same prompt

Physics, perspective and recursive reflections, tested together. Explore the test ↗

Gemma 4 26B A4B8.2/100

Gemma 4 26B A4B: Newton's Mirror SVG benchmark
Researcher observations

Separate airborne black and contact-compatible paint flattening earn partial state credit. Settlement, adhesion and differentiated paint transport remain unresolved. The enlarged, low sphere and thin lamp strip substantially depart from the required camera, while the defining mirror structure is missing. Weak material appearance and oversized black paint limit material credit. The retained base total is 18/170; the floor-damage reward is 0, giving 18/180.

Benchmark task

A shiny steel ball spins in a room with mirrored walls and a mirrored floor. Red, cyan and black paint float above it. Gravity suddenly switches on. Draw the scene a moment later, as the ball drops and paint begins landing on its spinning surface. Show the reflections repeating through the room.

GPT-6 Astra62.7/100

GPT-6 Astra: Newton's Mirror SVG benchmark
Researcher observations

Major placement and the visible contact sequence are convincing. Dense planar light repetition, recognizable spherical panel images and simplified nested sphere motifs provide useful optical structure. Missing outer chains, truncated distant sequences and incorrect bead-like belts still leave the recursive reflections substantially incomplete.

Benchmark task

A shiny steel ball spins in a room with mirrored walls and a mirrored floor. Red, cyan and black paint float above it. Gravity suddenly switches on. Draw the scene a moment later, as the ball drops and paint begins landing on its spinning surface. Show the reflections repeating through the room.

Compare category scores
CategoryGemma 4 26B A4BGPT-6 Astra
State at 600 ms8.0/2525.0/25
Camera and placement2.0/1515.0/15
Reflections0.0/12054.0/120
Materials and scale2.0/1010.0/10
Floor-damage reward0.0/100.0/10

Selfie

Different prompts

Gemma 4 26B A4B52.8/100

Gemma 4 26B A4B: Selfie SVG benchmark
Researcher observations

An appealing, readable sparkle-creature with luminous colour and expressive eyes. Simple geometric construction limits sophistication, while sharp body points, ambiguous hand contact and a minimally resolved jar weaken the requested soft, plump character and treasure-presenting pose.

Prompt withheld

Prompt withheld.

GPT-6 Astra79.3/100

GPT-6 Astra: Selfie SVG benchmark
Researcher observations

The sixfold silhouette, pale coloring, outward heads and central hexagon closely match the brief. Fine scales and soft shading support rounded volume. However, several crossings have conspicuous rectangular seams and weak contact shadows, making the weave feel assembled. Small heads have limited anatomical definition, and the repetitive texture conveys less organic life than requested.

Benchmark task

Draw a pale six-headed snake woven into a symmetrical knot. Its body passes over and under itself around a small hexagonal opening, with six little heads facing outward. Add lifelike scales, curved muscles and shadows without losing the clear knot shape.

Compare category scores
CategoryGemma 4 26B A4BGPT-6 Astra
Prompt & likeness5.5/108.5/10
Anatomy & construction4.5/108.0/10
Space & placement6.0/107.5/10
Light & reflections6.0/107.0/10
Purposeful detail5.5/108.0/10
Artistry & character4.0/108.5/10
Materials & effects6.0/107.0/10
Visual integrity7.0/108.0/10

Mona Lisa

Same prompt

Gemma 4 26B A4B17.8/100

Gemma 4 26B A4B: Mona Lisa SVG benchmark
Researcher observations

The centered dark-haired portrait provides a loose reference cue, but its elongated, nearly featureless face and undifferentiated torso fall far short of replication. Crossed hands, the subtle smile, clothing structure and landscape are unresolved. Clean silhouettes and soft gradients provide limited coherence.

Benchmark task

Replicate mona-lisa as SVG

GPT-6 Astra68.2/100

GPT-6 Astra: Mona Lisa SVG benchmark
Researcher observations

The crossed hands, restrained smile, dark clothing and hazy landscape clearly recall the Mona Lisa. Replication is limited by the frontal, elongated face, schematic eyes and stiff fingers. Soft shading gives basic volume, but broad garment shapes and angular scenery lack the original’s nuanced depth and painterly transitions. The frame and composition are controlled; surface grain adds texture without resolving the simplified drawing.

Benchmark task

Replicate mona-lisa as SVG

Compare category scores
CategoryGemma 4 26B A4BGPT-6 Astra
Prompt & likeness0.5/107.0/10
Anatomy & construction2.0/106.5/10
Space & placement1.0/106.5/10
Light & reflections2.0/107.0/10
Purposeful detail1.0/106.5/10
Artistry & character2.0/107.0/10
Materials & effects1.0/107.0/10
Visual integrity4.5/107.5/10

Beach

Same prompt

Gemma 4 26B A4B28.5/100

Gemma 4 26B A4B: Beach SVG benchmark
Researcher observations

A clean, balanced sunset scene demonstrates the beach, birds and a centered reflection. Animals and play receive only minimal treatment. Coherent layers and controlled gradients support readability, but unresolved aquatic anatomy, sparse details and weak surface modeling keep the drawing basic.

Benchmark task

Create an SVG of a amazing beach scene. Sunset, animals, fun, birds, reflections

GPT-6 Astra81.8/100

GPT-6 Astra: Beach SVG benchmark
Researcher observations

A richly composed sunset beach illustration with cohesive peach, mauve and teal colors. Sweeping palm fronds, a scalloped umbrella and curved shorelines frame the sun and its aligned reflection. Distinct animal silhouettes and carefully distributed beach details reward inspection. Simplified human and dog anatomy, slight dolphin splash cues and inconsistent equipment shadows limit physical conviction.

Benchmark task

Create an SVG of a amazing beach scene. Sunset, animals, fun, birds, reflections

Compare category scores
CategoryGemma 4 26B A4BGPT-6 Astra
Prompt & likeness3.5/109.0/10
Anatomy & construction2.0/107.5/10
Space & placement3.5/108.5/10
Light & reflections5.0/107.5/10
Purposeful detail1.0/108.5/10
Artistry & character1.5/109.0/10
Materials & effects2.0/107.5/10
Visual integrity6.0/108.0/10

Ground Truth

Same prompt

Gemma 4 26B A4B12.4/100

Gemma 4 26B A4B: Ground Truth SVG benchmark
Benchmark task

A dark steel room has four pillars and two warm ceiling lights. A wooden plank is placed over a computer mouse, with a blueberry on the plank above it. Draw the scene a few seconds later, showing how the objects settle and how the light, shadows and surfaces look.

GPT-6 Astra68.7/100

GPT-6 Astra: Ground Truth SVG benchmark
Benchmark task

A dark steel room has four pillars and two warm ceiling lights. A wooden plank is placed over a computer mouse, with a blueberry on the plank above it. Draw the scene a few seconds later, showing how the objects settle and how the light, shadows and surfaces look.

Raccoon

Same prompt

Gemma 4 26B A4B40.3/100

Gemma 4 26B A4B: Raccoon SVG benchmark
Researcher observations

The animal stack is recognizable, and clean silhouettes support a basic illustration. Steering is not depicted, while the craft's construction and water contact remain unresolved. Sparse anatomical and material detail limit the finish. The sky gradient and glow provide atmospheric lighting, but the subjects lack corresponding modeling.

Benchmark task

Generate an SVG: A raccoon sits on a dog's back while the dog steers a jet ski

GPT-6 Astra78.8/100

GPT-6 Astra: Raccoon SVG benchmark
Researcher observations

Expressive animals, a balanced sunset composition and sweeping wake make an appealing illustration. The raccoon rides the dog's back, and the dog's connected foreleg reaches the controls. The compact steering assembly and layered paws are less clearly constructed. Lighting remains mostly flat, with little shadow or sun reflection. Clean contours and purposeful details support strong illustrative execution.

Benchmark task

Generate an SVG: A raccoon sits on a dog's back while the dog steers a jet ski

Compare category scores
CategoryGemma 4 26B A4BGPT-6 Astra
Prompt & likeness4.5/108.5/10
Anatomy & construction3.5/107.5/10
Space & placement4.0/108.0/10
Light & reflections4.5/106.5/10
Purposeful detail2.5/108.0/10
Artistry & character4.0/108.5/10
Materials & effects2.5/108.0/10
Visual integrity7.0/108.5/10

Pelican

Same prompt

Gemma 4 26B A4B48.5/100

Gemma 4 26B A4B: Pelican SVG benchmark
Researcher observations

A clean, balanced icon suggests a pelican riding a bicycle. Continuous contours and restrained colors support its finish, but the abbreviated bill, undifferentiated body, unresolved riding contacts and incomplete bicycle mechanism limit likeness and construction. Sparse detail and flat lighting keep the drawing basic despite its clarity.

Benchmark task

Generate an SVG of a pelican riding a bicycle

GPT-6 Astra75.0/100

GPT-6 Astra: Pelican SVG benchmark
Researcher observations

The pelican's long bill, flowing scarf and warm coastal palette create a charming, balanced illustration. Wheels, spokes and frame are largely coherent, but neither wing reaches the handlebars, and the rear leg's pedal contact is unclear. Flat lighting and simplified surfaces limit depth despite clean outlines and attractive feather detail.

Benchmark task

Generate an SVG of a pelican riding a bicycle

Compare category scores
CategoryGemma 4 26B A4BGPT-6 Astra
Prompt & likeness5.5/108.0/10
Anatomy & construction3.5/106.5/10
Space & placement6.0/107.5/10
Light & reflections4.0/107.0/10
Purposeful detail3.0/108.0/10
Artistry & character4.5/108.0/10
Materials & effects4.0/107.5/10
Visual integrity8.5/108.0/10