STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Cat Jam Free vs Claude Opus 5.5

Claude Opus 5.5 leads Cat Jam Free by 39.1 points on StealthMark, 72.6 to 33.5. It leads on all 9 benchmarks. Claude Opus 5.5 scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
Model guide ↗
All results ↗

Overall StealthMark

33.5/100Overall rank 40/53
72.6/100Overall rank 2/53

General Intelligence

27.7/100
71.3/100

Visual Intelligence

43.0/100
75.0/100

Reasoning efficiency

On every task, result quality and reasoning tokens are each compared with all measured models and weighed equally. Each dot is one model.

Single-step reasoning Result quality weighed against reasoning tokens on a single problem

Multi-step reasoning Result quality weighed against reasoning tokens across connected steps, as in agentic workflows

  • Claude Opus 5.5

Open or local

NeitherApache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Cat Jam Free
  • Claude Opus 5.5
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Cat Jam Free
  • Claude Opus 5.5
  • Other models
  • Median
PricePer 1M output tokens, input below
Cat Jam Free: No list priceClaude Opus 5.5: $20$4 input
Context windowTokens per request, max output below
Cat Jam Free: Not publishedClaude Opus 5.5: 1M128K max output
Output speedTokens per second, our measurement
Cat Jam Free: Not measuredClaude Opus 5.5: 166tokens/s
Developer
Not publishedAnthropic
Released
Not published22 Sep 2026
Origin
Not publishedUnited States
Input → output
Not publishedText, image → text

Full datasheets, every price and sourceClaude Opus 5.5 ↗

Anticipating threats and planning ahead. Collect coins while avoiding ghosts. Ghosts move before the player each turn, and collisions cost a life. 3 levels in sequence, up to 66 turns in total. Earlier moves and outcomes carry forward, testing learning across levels.

Cat Jam Free 33.8/100Rank 26/47

Survived 1 of 3
Foresight: complete playing field
Level 39 ptsTurn 20 / 20

Claude Opus 5.5 66.3/100Rank 5/47

Survived 3 of 3
Foresight: complete playing field
Level 39 ptsTurn 20 / 20

Points per level

LevelCat Jam FreeClaude Opus 5.5
Level 1Second Thoughts
5 ptsOut of lives
27 ptsSurvived
Level 2Pressure Pot
6 ptsOut of lives
11 ptsSurvived
Level 3Hide or Flight
9 ptsSurvived
9 ptsSurvived

Cooperative planning and learning from experience. Coordinate two robots to push numbered cores onto matching sockets. Pressure plates hold doors open; moving either robot uses one turn. 5 levels in sequence, up to 152 turns in total. Earlier moves and outcomes carry forward, testing learning across levels.

Cat Jam Free 33.9/100Rank 33/48

Cleared 2 of 5
Latch: complete playing field
Level 56 ptsTurn 25 / 40

Claude Opus 5.5 87.6/100Rank 1/48

Cleared 5 of 5
Latch: complete playing field
Level 520.6 ptsTurn 27 / 40

Points per level

LevelCat Jam FreeClaude Opus 5.5
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
10.2 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
10 ptsFinished early
19.2 ptsCleared
Level 4Passing bay
10.8 ptsFinished early
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
6 ptsFinished early
20.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Cat Jam Free

The image conveys a supported central sphere, separate black paint and crimson below cyan. Its contact and transport story is partially resolved. The exterior cutaway camera and largely missing mirror system dominate the limitations; isolated discs and smooth highlights provide little coherent optical structure.

Claude Opus 5.5

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.

Score breakdown

CategoryCat Jam FreeClaude Opus 5.5
State at 600 ms14.0/2524.0/25
Camera and placement4.0/1515.0/15
Reflections3.5/12055.0/120
Materials and scale4.0/109.0/10
Floor-damage reward0.0/100.0/10

Benchmark task

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

Selfie

Different task instructions

Visual construction and creative interpretation.

The judgment

Cat Jam Free

A coherent, restrained cat illustration captures the pale palette and intent eyes. Its central expressive requirement—the committed forward-and-down neck bob—is insufficiently articulated. Simple geometry, faint paw construction and minimal surface detail limit the physical presence and finish.

Claude Opus 5.5

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.

Score breakdown

CategoryCat Jam FreeClaude Opus 5.5
Task & likeness5.5/108.0/10
Anatomy & construction5.5/107.5/10
Space & placement6.0/108.0/10
Light & reflections6.0/107.5/10
Purposeful detail4.0/107.0/10
Artistry & character5.5/107.0/10
Materials & effects5.0/107.0/10
Visual integrity6.5/108.5/10

Benchmark task

Cat Jam Free

An ivory cat nods intently to music beside a tiny speaker. The scene tests feline anatomy, movement conveyed through a still pose and the contrast between pale fur and woven fabric.

Claude Opus 5.5

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

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Cat Jam Free

The portrait is recognizable and cleanly assembled, but replication remains basic. Its frontal symmetry, elongated silhouette, simplified facial likeness and unresolved hands differ markedly from the original. Modest skin gradients provide volume, while clothing and landscape rely on broad, flat shapes.

Claude Opus 5.5

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.

Score breakdown

CategoryCat Jam FreeClaude Opus 5.5
Task & likeness2.5/106.5/10
Anatomy & construction2.0/105.5/10
Space & placement4.0/106.5/10
Light & reflections3.5/106.5/10
Purposeful detail3.0/106.5/10
Artistry & character3.0/106.0/10
Materials & effects2.5/107.0/10
Visual integrity5.5/107.0/10

Benchmark task

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

Beach

Same task instructions

Creativity, perspective and visual beauty.

The judgment

Cat Jam Free

The scene clearly supplies the requested beach subjects and playful activity. Clean silhouettes and warm gradients support readability, but elementary drawing, ambiguous parasol construction, weak grounding and a rigid sun reflection limit its depth and finish.

Claude Opus 5.5

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.

Score breakdown

CategoryCat Jam FreeClaude Opus 5.5
Task & likeness7.0/108.5/10
Anatomy & construction4.5/107.5/10
Space & placement4.5/107.0/10
Light & reflections4.0/107.5/10
Purposeful detail4.0/107.5/10
Artistry & character4.5/108.0/10
Materials & effects4.5/106.5/10
Visual integrity5.5/108.0/10

Benchmark task

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

Ground Truth

Same task instructions

Physical reasoning, light and visual reconstruction.

The judgment

Cat Jam Free

This benchmark has not been assessed yet.

Claude Opus 5.5

This benchmark has not been assessed yet.

Benchmark task

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

Raccoon

Same task instructions

Scene composition and interacting subjects.

The judgment

Cat Jam Free

An appealing cartoon demonstrates the back-riding arrangement through expressive faces and clean shapes. Uncertain steering contact, indistinct deck support and weak hull-water interaction limit physical coherence. Smooth gradients add volume, but simple rounded construction and sparse material detail constrain complexity and finish.

Claude Opus 5.5

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.

Score breakdown

CategoryCat Jam FreeClaude Opus 5.5
Task & likeness6.0/108.5/10
Anatomy & construction5.0/107.5/10
Space & placement5.0/107.5/10
Light & reflections5.0/106.0/10
Purposeful detail6.0/108.5/10
Artistry & character5.0/107.0/10
Materials & effects5.0/107.0/10
Visual integrity4.5/108.0/10

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.

Pelican

Same task instructions

Subject construction and spatial relationships.

The judgment

Cat Jam Free

A coherent cartoon with readable bicycle placement, controlled outlines and modest surface shading. The separated-looking upper bill weakens pelican likeness; schematic limbs, uncertain gripping contact and simplified mechanics constrain construction. Opaque wheel interiors flatten spatial relationships. Limited feather complexity and directional lighting keep the finish modest.

Claude Opus 5.5

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.

Score breakdown

CategoryCat Jam FreeClaude Opus 5.5
Task & likeness7.0/108.5/10
Anatomy & construction5.0/108.0/10
Space & placement6.0/107.0/10
Light & reflections5.0/106.0/10
Purposeful detail5.5/108.0/10
Artistry & character5.5/107.5/10
Materials & effects6.5/106.0/10
Visual integrity6.5/108.5/10

Benchmark task

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