STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Claude Opus 5.5 vs Owl Alpha

Claude Opus 5.5 scores 25.2 points higher overall (66.0 vs 40.8). Claude Opus 5.5 scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
Model guide ↗

Overall StealthMark

66.0/100
40.8/100

General Intelligence

55.3/100
23.0/100

Visual Intelligence

74.5/100
52.4/100

Newton's Mirror

Same prompt

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

Claude Opus 5.552.5/100

Claude Opus 5.5: Newton's Mirror SVG benchmark
Researcher observations

Open lateral sightlines, first reflected silhouettes and near-field planar panel placement are convincing. Missing outer chains, truncated repetitions and absent nested spherical room and emitter imagery remain the main weaknesses.

Prompt withheld

This prompt is held back to prevent benchmaxxing.

Owl Alpha18.6/100

Owl Alpha: Newton's Mirror SVG benchmark
Researcher observations

Cyan lies on the sphere's facing middle rather than showing its recent interaction near the apex. Separate airborne black and elongated crimson support part of the timing sequence. Small side images and an overlapping lower image provide limited reflection ordering, but recursive room structure, nested imagery and emitter mappings are largely absent. The main sphere is smaller and higher in the frame than prescribed, and the surfaces have a soft, matte appearance.

Prompt withheld

This prompt is held back to prevent benchmaxxing.

Compare category scores
CategoryClaude Opus 5.5Owl Alpha
State at 600 ms25.0/2514.5/25
Camera and placement15.0/158.0/15
Reflections46.5/1205.0/120
Materials and scale8.0/106.0/10
Floor-damage reward0.0/100.0/10

Selfie

Different prompts

Claude Opus 5.578.3/100

Claude Opus 5.5: Selfie SVG benchmark
Researcher observations

The centered coral squid has a friendly, restrained expression and a balanced radial silhouette within a cream arch. Smooth curves and soft shading give it an appealing matte finish. The mantle is more elongated than compact, the upper arms are visually ambiguous, and the two hanging tentacles read somewhat like legs. Clean execution supports a strong stylized illustration.

Prompt withheld

This prompt is held back to prevent benchmaxxing.

Owl Alpha62.0/100

Owl Alpha: Selfie SVG benchmark
Researcher observations

Amber slit eyes, a pointed beak, cream feathers and gold-trimmed black clothing establish the secretive owl rogue. The head appears frontal rather than lowered, with much of the face exposed. The centered silhouette is effective, but stiff cloak geometry, shallow facial modeling and extremely dark clothing limit depth and finish. Sparse gold markings suggest the requested circuitry only loosely.

Prompt withheld

This prompt is held back to prevent benchmaxxing.

Compare category scores
CategoryClaude Opus 5.5Owl Alpha
Prompt & likeness8.0/107.0/10
Anatomy & construction7.5/106.0/10
Space & placement8.0/106.0/10
Light & reflections7.5/105.5/10
Purposeful detail7.5/106.0/10
Artistry & character8.0/106.5/10
Materials & effects7.5/105.5/10
Visual integrity8.5/106.5/10

Beach

Different prompts

Claude Opus 5.578.0/100

Claude Opus 5.5: Beach SVG benchmark
Researcher observations

A lively, well-composed beach illustration with rich sunset colors, recognizable animals and appealing accessories. The sun reflection establishes a strong central focus. Clean silhouettes and small details reward inspection, though simplified animal construction, uneven contact shadows and mostly flat materials limit depth and realism.

Exact prompt

Create an SVG of a amazing beach scene. Sunset, animals, fun, birds, reflections Make it a masterpiece, no tools allowed

Owl Alpha60.3/100

Owl Alpha: Beach SVG benchmark
Researcher observations

The sunset, palms, birds and beach animals create a cheerful, readable scene. Clean silhouettes and a vivid sky establish the composition, but construction remains schematic. The right palm appears rooted in open water, shadows have limited connection to the sunset, and the sun’s reflection consists of rigid bands. Small creatures and beach equipment are recognizable but minimally developed.

Exact prompt

Create an SVG of a amazing beach scene. Sunset, animals, fun, birds, reflections Make it a masterpiece You may NOT use tools, browser, image analysis. Directly output the SVG as code

Compare category scores
CategoryClaude Opus 5.5Owl Alpha
Prompt & likeness8.5/107.5/10
Anatomy & construction7.5/105.5/10
Space & placement7.0/105.5/10
Light & reflections8.0/106.0/10
Purposeful detail8.0/105.5/10
Artistry & character8.0/106.0/10
Materials & effects6.5/104.5/10
Visual integrity8.5/107.0/10

Mona Lisa

Different prompts

Claude Opus 5.564.8/100

Claude Opus 5.5: Mona Lisa SVG benchmark
Researcher observations

The portrait preserves the recognizable composition, dark veil, folded hands and distant landscape. Replication is limited by the elongated face and neck, conspicuous eyes and simplified smile. Hands remain connected but their rounded fingers and wrists lack convincing anatomy. Restrained colors create cohesion; shallow modeling and pervasive mottling weaken volume and painterly subtlety.

Exact prompt

Replicate mona-lisa as SVG Make it a masterpiece, no tools allowed

Owl Alpha32.5/100

Owl Alpha: Mona Lisa SVG benchmark
Researcher observations

The centered portrait, slight smile, overlapping hands and distant landscape suggest Mona Lisa, but replication is weak. The face has little volume, the shoulders and torso form a narrow wedge, and the hands are fingerless ovals with unresolved wrists. Broad gray background bands provide limited depth. A bright head rim and pale hands contrast with an almost featureless dark figure.

Exact prompt

Generate an SVG of mona-lisa Make it a masterpiece You may NOT use tools, browser, image analysis. Directly output the SVG as code

Compare category scores
CategoryClaude Opus 5.5Owl Alpha
Prompt & likeness7.0/104.0/10
Anatomy & construction6.0/103.0/10
Space & placement6.5/104.0/10
Light & reflections6.0/103.0/10
Purposeful detail6.5/102.0/10
Artistry & character6.5/103.0/10
Materials & effects6.5/102.0/10
Visual integrity7.0/104.0/10

Raccoon

Different prompts

Claude Opus 5.575.0/100

Claude Opus 5.5: Raccoon SVG benchmark
Researcher observations

The masked raccoon clearly rides the dog's back, and the dog's forward paw reaches the steering grip. Expressive faces, vivid colors and sweeping wakes create an appealing illustration. Connected limbs remain schematic, as does the small steering assembly. The broad hull and flat foam weaken water contact; the glowing sun lacks a corresponding reflection or convincing cast shadows.

Exact prompt

Generate an SVG: A raccoon sits on a dog's back while the dog steers a jet ski Make it a masterpiece, no tools allowed

Owl Alpha52.3/100

Owl Alpha: Raccoon SVG benchmark
Researcher observations

The raccoon is recognizable and expressive, with a clear mask and striped tail. The dog's anatomy is poorly resolved, and the flattened craft lacks convincing steering and seating. Feet extend below the hull, weakening the sense of support. An appealing palette, clean shapes and decorative water effects give the illustration some polish.

Exact prompt

SVG of a raccoon that sits on a dog's back while the dog steers a jet ski Make it a masterpiece You may NOT use tools, browser, image analysis. Directly output the SVG as code

Compare category scores
CategoryClaude Opus 5.5Owl Alpha
Prompt & likeness8.5/105.5/10
Anatomy & construction7.0/104.0/10
Space & placement7.5/104.5/10
Light & reflections6.0/105.0/10
Purposeful detail7.5/105.5/10
Artistry & character8.0/106.0/10
Materials & effects7.0/105.5/10
Visual integrity8.0/107.0/10

Pelican

Benchmax control

Outside General and Visual Intelligence.

Claude Opus 5.572.5/100

Claude Opus 5.5: Pelican SVG benchmark
Researcher observations

The recognizable pelican, orderly bicycle wheels and harmonious sunset create an appealing illustration. Both legs connect to the body and reach pedals; no clear detached or inverted parts appear. Steering contact and seating support are less convincing, while the drivetrain remains schematic. Crisp outlines give a clean finish, but limited shading and flat surfaces leave the scene with modest depth.

Exact prompt

Generate an SVG of a pelican riding a bicycle Make it a masterpiece, no tools allowed

Owl Alpha79.0/100

Owl Alpha: Pelican SVG benchmark
Researcher observations

A clearly recognizable pelican cycles through a well-composed coastal sunset. Warm colors, flowing scarf, feather contours and bicycle details give the illustration character. The legs connect to the body, but the farther foot's pedal contact and the wing's handlebar grip remain ambiguous. Clean vector shapes provide polish, with limited material texture and directional shading.

Exact prompt

Generate a still SVG of a pelican riding a bicycle Make it a masterpiece You may NOT use tools, browser, image analysis. Directly output the SVG as code

Compare category scores
CategoryClaude Opus 5.5Owl Alpha
Prompt & likeness8.5/108.5/10
Anatomy & construction6.5/107.0/10
Space & placement7.0/108.0/10
Light & reflections6.0/107.5/10
Purposeful detail7.5/108.0/10
Artistry & character7.5/108.5/10
Materials & effects6.0/107.0/10
Visual integrity8.5/108.5/10