STEALTHMARK · HEAD TO HEAD

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Claude Fable 5.1 vs MISSINGNO.

Claude Fable 5.1 scores 24.3 points higher overall (62.3 vs 38.0). Claude Fable 5.1 scores higher on Newton's Mirror, with its largest category advantage in reflections.

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Model guide ↗

Overall StealthMark

62.3/100
38.0/100

General Intelligence

58.4/100
33.6/100

Visual Intelligence

66.9/100
43.3/100

Newton's Mirror

Same task instructions

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

Claude Fable 5.153.8/100

Claude Fable 5.1: Newton's Mirror SVG benchmark
Researcher observations

The broad paint sequence, bilateral near-field sphere arrangement, overlaps and diminishing panel repetitions are recognizable; crimson is slightly too low. Small paint scale and basic shading provide material cues, although the steel response remains soft. Inaccurate light projections, missing outer chains and incomplete nested room imagery remain the principal limitations.

Benchmark task

A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.

MISSINGNO.24.1/100

MISSINGNO.: Newton's Mirror SVG benchmark
Researcher observations

The centered sphere, separate airborne black blob and cyan-above-crimson ordering provide limited valid structure. The colored beads do not establish the required impact and transport histories. One dim floor image supports a small part of the optical system, while the defining wall repetitions, nested sphere imagery and emitter mappings are missing. Rounded volume and some gloss earn material credit, tempered by soft surface appearance and excessive paint-bead scale.

Benchmark task

A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.

Compare category scores
CategoryClaude Fable 5.1MISSINGNO.
State at 600 ms24.0/2511.5/25
Camera and placement14.0/157.0/15
Reflections48.0/12012.0/120
Materials and scale7.0/105.5/10
Floor-damage reward0.0/100.0/10

Selfie

Different task instructions

Claude Fable 5.168.2/100

Claude Fable 5.1: Selfie SVG benchmark
Researcher observations

The coral palette, friendly face, matte shading and cream arch create a coherent emblem. However, the mantle is elongated rather than compact, and the appendages spread mostly sideways and downward instead of forming an evenly spaced, flower-like starburst. Two thin hanging appendages weaken the thick-arm motif. Clean contours and balanced framing support the simple design.

Benchmark task

A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.

MISSINGNO.49.7/100

MISSINGNO.: Selfie SVG benchmark
Researcher observations

An appealing purple character with a readable pleased expression and raised-moustache joke. Smooth shading and clean contours support the simple design, but indistinct mitten grips, minimally textured curls and an uncompressed strap weaken the requested physical interaction. The jelly suggests gloss more convincingly than translucency.

Benchmark task

A glossy purple jelly struggles with an oversized fake moustache at a playful checkpoint. The scene tests comic expression, physical contact and the appearance of a soft translucent body.

Compare category scores
CategoryClaude Fable 5.1MISSINGNO.
Task & likeness6.5/105.5/10
Anatomy & construction7.0/104.5/10
Space & placement7.5/106.0/10
Light & reflections6.5/105.5/10
Purposeful detail6.0/104.5/10
Artistry & character7.0/104.5/10
Materials & effects6.5/104.0/10
Visual integrity8.0/106.0/10

Mona Lisa

Different task instructions

Claude Fable 5.157.6/100

Claude Fable 5.1: Mona Lisa SVG benchmark
Researcher observations

The dark clothing, crossed hands and hazy landscape establish the Mona Lisa composition. Replication is limited by the frontal, elongated face, wide eyes and simplified smile. Rounded, parallel fingers and unclear wrist transitions weaken the hands. Warm facial shading gives some volume, but broad garment shapes and scattered crack marks substitute for convincing folds and painterly detail.

Benchmark task

An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.

MISSINGNO.28.1/100

MISSINGNO.: Mona Lisa SVG benchmark
Researcher observations

Clean contours, connected body forms and gentle gradients support a basic, coherent portrait. Likeness remains weak: the face dominates the body, the seated angle is lost, and crossed hands become dark lobes without traceable wrists or fingers. Readable facial details add some drawing complexity, but clothing, landscape and material treatment remain sparse.

Benchmark task

An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.

Compare category scores
CategoryClaude Fable 5.1MISSINGNO.
Task & likeness5.5/101.5/10
Anatomy & construction6.0/102.5/10
Space & placement6.0/102.5/10
Light & reflections6.0/103.0/10
Purposeful detail5.0/102.0/10
Artistry & character5.5/103.5/10
Materials & effects6.0/102.0/10
Visual integrity6.5/106.0/10

Beach

Different task instructions

Claude Fable 5.173.8/100

Claude Fable 5.1: Beach SVG benchmark
Researcher observations

The colorful sunset, layered shoreline, animals, kite and beach toys fulfill the lively beach brief. Clean silhouettes and a balanced composition give the illustration character. Construction is simplified: the umbrella resembles a segmented fan, dolphins have weak water interaction, and the sun’s reflection forms a rigid widening wedge. Flat surfaces and sparse contact shadows limit depth.

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

MISSINGNO.43.9/100

MISSINGNO.: Beach SVG benchmark
Researcher observations

A coherent sunset beach with clear requested subjects, balanced framing and clean shapes. The aligned solar reflection and warm gradients establish atmosphere. Primitive animal construction, ambiguous furniture, sparse depth cues and minimally developed surfaces limit its drawing complexity and physical richness.

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

Compare category scores
CategoryClaude Fable 5.1MISSINGNO.
Task & likeness8.5/107.0/10
Anatomy & construction7.0/104.0/10
Space & placement7.0/106.5/10
Light & reflections7.0/105.0/10
Purposeful detail7.5/103.0/10
Artistry & character7.5/103.0/10
Materials & effects6.5/105.0/10
Visual integrity7.5/103.5/10

Ground Truth

Same task instructions

Claude Fable 5.163.8/100

Claude Fable 5.1: Ground Truth SVG benchmark
Benchmark task

A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.

MISSINGNO.44.1/100

MISSINGNO.: Ground Truth SVG benchmark
Benchmark task

A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.

Raccoon

Different task instructions

Claude Fable 5.170.0/100

Claude Fable 5.1: Raccoon SVG benchmark
Researcher observations

The raccoon rides on the dog's back, and the dog's extended foreleg reaches the jet ski controls. Expressive faces, a clear silhouette and sweeping spray make the action readable. Limb and handlebar overlaps weaken construction; broad shading provides limited volume, and the glowing sun has little corresponding reflection on the water. Clean vector shapes support an appealing but simplified illustration.

Benchmark task

A jet-ski scene pairs a canine driver with a raccoon passenger. It tests the placement and contact of interacting subjects, along with vehicle construction.

MISSINGNO.57.5/100

MISSINGNO.: Raccoon SVG benchmark
Researcher observations

The requested interaction reads clearly through recognizable animals, expressive faces and a coherent hull-water relationship. Clean curves and readable accessories give the cartoon polish. Partly unresolved grips and supporting contacts limit physical construction; modest shape complexity, weak directional lighting and schematic water constrain its finish.

Benchmark task

A jet-ski scene pairs a canine driver with a raccoon passenger. It tests the placement and contact of interacting subjects, along with vehicle construction.

Compare category scores
CategoryClaude Fable 5.1MISSINGNO.
Task & likeness8.5/108.0/10
Anatomy & construction6.5/105.0/10
Space & placement7.0/105.5/10
Light & reflections5.5/105.0/10
Purposeful detail7.0/106.0/10
Artistry & character7.5/105.0/10
Materials & effects6.5/104.5/10
Visual integrity7.5/107.0/10

Pelican

Different task instructions

Claude Fable 5.173.3/100

Claude Fable 5.1: Pelican SVG benchmark
Researcher observations

The pelican reads clearly, with an expressive face, prominent bill and appealing composition. Both legs connect to the body, but the far foot's pedal contact and the wing's steering grip remain unclear. Wheel alignment and background layers are coherent. Clean contours and feather lines give polish, while schematic machinery, limited surface texture and weak directional lighting constrain the finish.

Benchmark task

A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.

MISSINGNO.58.8/100

MISSINGNO.: Pelican SVG benchmark
Researcher observations

A coherent, cheerful illustration with recognizable pelican features, balanced composition, clean contours and useful small details. Its controlled curves and layered wheels demonstrate competent drawing skill. Ambiguous pedal and steering contacts, sparse drivetrain construction and weak directional lighting limit the riding mechanics and finish.

Benchmark task

A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.

Compare category scores
CategoryClaude Fable 5.1MISSINGNO.
Task & likeness8.5/107.0/10
Anatomy & construction7.0/105.5/10
Space & placement7.5/106.0/10
Light & reflections6.0/105.0/10
Purposeful detail7.0/105.5/10
Artistry & character7.5/106.0/10
Materials & effects6.0/104.5/10
Visual integrity8.0/106.5/10