STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Cat Jam Free vs GPT-5.5

Cat Jam Free leads GPT-5.5 by 2.2 points on StealthMark, 33.5 to 31.3. It leads on 4 of the 7 benchmarks with results for both and GPT-5.5 on 3. Cat Jam Free scores higher on Raccoon, with its largest category advantage in anatomy & construction.

See the difference ↘
Model guide ↗
All results ↗

Overall StealthMark

33.5/100Overall rank 40/53
31.3/100Overall rank 43/53

General Intelligence

27.7/100
26.8/100

Visual Intelligence

43.0/100
36.3/100

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

  • GPT-5.5Multi-step reasoning not measured

Open or local

NeitherApache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Cat Jam Free
  • GPT-5.5
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Cat Jam Free
  • GPT-5.5
  • Other models
  • Median
PricePer 1M output tokens, input below
Cat Jam Free: No list priceGPT-5.5: $30$5 input
Context windowTokens per request, max output below
Cat Jam Free: Not publishedGPT-5.5: 1.05M128K max output
Output speedTokens per second, our measurement
Cat Jam Free: Not measuredGPT-5.5: 193tokens/s
Developer
Not publishedOpenAI
Released
Not published23 Apr 2026
Origin
Not publishedUnited States
Input → output
Not publishedText, image → text

Full datasheets, every price and sourceGPT-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

Points per level

LevelCat Jam FreeGPT-5.5
Level 1Second Thoughts
5 ptsOut of lives
No run
Level 2Pressure Pot
6 ptsOut of lives
No run
Level 3Hide or Flight
9 ptsSurvived
No run

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

Points per level

LevelCat Jam FreeGPT-5.5
Level 1Hold the door
5.2 ptsCleared
No run
Level 2Crossfeed
9.8 ptsCleared
No run
Level 3Relay vault
10 ptsFinished early
No run
Level 4Passing bay
10.8 ptsFinished early
No run
Level 5Second thoughts
6 ptsFinished early
No run

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.

GPT-5.5

The paint ordering and separate black bead support part of the physical state, but adhesion and rotational transport remain only partly established. The sweeping cyan arc and long crimson lobes do not clearly communicate the limited time since their respective impacts. The main sphere is too large and too low, and the black bead is below its required projected position. Displaced isolated sphere images, a flattened floor echo and missing recursive, nested and emitter reflections provide little coherent optical structure. The colored paint is excessively bulky for the specified quantities.

Score breakdown

CategoryCat Jam FreeGPT-5.5
State at 600 ms14.0/2515.0/25
Camera and placement4.0/156.0/15
Reflections3.5/1205.0/120
Materials and scale4.0/106.0/10
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.

GPT-5.5

Six pale, scaled lobes form a balanced radial arrangement, but they remain separate capsules rather than an interlocking serpent knot. There are no crossings, alternating overlaps, or crisp inner bends; the central hexagon is an isolated outline. Small outward-facing heads sit within the lobes without integrated necks. Soft shading and tidy contours provide some finish, while repetitive oval scales and cartoon faces limit organic credibility.

Score breakdown

CategoryCat Jam FreeGPT-5.5
Task & likeness5.5/103.0/10
Anatomy & construction5.5/103.0/10
Space & placement6.0/105.0/10
Light & reflections6.0/105.0/10
Purposeful detail4.0/104.5/10
Artistry & character5.5/104.0/10
Materials & effects5.0/104.5/10
Visual integrity6.5/107.0/10

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.

GPT-5.5

A pale serpent woven into an interlocking knot tests connected anatomy, repeated structure and readable overlaps. Organic surface detail must work with the overall geometry.

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.

GPT-5.5

The veil, restrained smile, crossed hands and muted landscape establish Mona Lisa references. The oversized frontal face and schematic features weaken likeness and expression, while fingerless tapered hand shapes leave anatomy unresolved. Clean contours and balanced framing provide coherence, but sparse garment detail, broad landscape bands and shallow shading limit the portrait's sophistication.

Score breakdown

CategoryCat Jam FreeGPT-5.5
Task & likeness2.5/101.5/10
Anatomy & construction2.0/101.5/10
Space & placement4.0/101.5/10
Light & reflections3.5/102.0/10
Purposeful detail3.0/102.5/10
Artistry & character3.0/101.5/10
Materials & effects2.5/102.0/10
Visual integrity5.5/101.5/10

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.

GPT-5.5

The sunset, palms, birds, playful animals and ball clearly establish the requested beach scene. Warm sky gradients and clean silhouettes make it appealing. Animal construction is underdeveloped: torso and limb connections are unclear, especially in the round-eared foreground figure. The dolphin lacks a convincing splash, and broad reflection bands suggest sunset light without resolving its behavior on water.

Score breakdown

CategoryCat Jam FreeGPT-5.5
Task & likeness7.0/107.0/10
Anatomy & construction4.5/102.5/10
Space & placement4.5/103.0/10
Light & reflections4.0/103.0/10
Purposeful detail4.0/103.0/10
Artistry & character4.5/103.0/10
Materials & effects4.5/103.0/10
Visual integrity5.5/103.5/10

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.

GPT-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.

GPT-5.5

The raccoon's masked face, bright hull and sweeping wake make the scene readable and lively. The dog is much less resolved: its head is ambiguous, overlapping brown forms obscure its anatomy, and its paws do not visibly grip the controls. Smooth shapes and cheerful colors provide appeal, but weak steering construction and limited depth keep the drawing uneven.

Score breakdown

CategoryCat Jam FreeGPT-5.5
Task & likeness6.0/103.5/10
Anatomy & construction5.0/103.0/10
Space & placement5.0/104.5/10
Light & reflections5.0/105.0/10
Purposeful detail6.0/103.5/10
Artistry & character5.0/103.0/10
Materials & effects5.0/105.0/10
Visual integrity4.5/103.0/10

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.

GPT-5.5

The oversized bill, bright bicycle and sunset create an appealing, recognizable cartoon. Riding mechanics are less convincing: the wing has no clear steering contact, leg attachments are uneven, and feet do not visibly engage pedals. A dark notch complicates the rear neck junction. Clean contours and orderly spokes provide polish, while simplified anatomy and lighting limit depth.

Score breakdown

CategoryCat Jam FreeGPT-5.5
Task & likeness7.0/107.5/10
Anatomy & construction5.0/104.5/10
Space & placement6.0/106.5/10
Light & reflections5.0/106.5/10
Purposeful detail5.5/105.5/10
Artistry & character5.5/105.0/10
Materials & effects6.5/106.0/10
Visual integrity6.5/107.5/10

Benchmark task

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