STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Cat Jam Free vs GPT-5.6 Sol

GPT-5.6 Sol leads Cat Jam Free by 20.6 points on StealthMark, 54.1 to 33.5. It leads on all 9 benchmarks. GPT-5.6 Sol scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

See the difference ↘
Model guide ↗
All results ↗

Overall StealthMark

33.5/100Overall rank 40/53
54.1/100Overall rank 12/53

General Intelligence

27.7/100
51.9/100

Visual Intelligence

43.0/100
58.2/100

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

Open or local

NeitherApache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Cat Jam Free
  • GPT-5.6 Sol
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Cat Jam Free
  • GPT-5.6 Sol
  • Other models
  • Median
PricePer 1M output tokens, input below
Cat Jam Free: No list priceGPT-5.6 Sol: $20$4 input
Context windowTokens per request, max output below
Cat Jam Free: Not publishedGPT-5.6 Sol: 1.05M128K max output
Output speedTokens per second, our measurement
Cat Jam Free: Not measuredGPT-5.6 Sol: 81tokens/s
Developer
Not publishedOpenAI
Released
Not published9 Jul 2026
Origin
Not publishedUnited States
Input → output
Not publishedText, image → text

Full datasheets, every price and sourceGPT-5.6 Sol ↗

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

GPT-5.6 Sol 62.9/100Rank 8/47

Survived 1 of 3
Foresight: complete playing field
Level 311 ptsTurn 17 / 20

Points per level

LevelCat Jam FreeGPT-5.6 Sol
Level 1Second Thoughts
5 ptsOut of lives
27 ptsSurvived
Level 2Pressure Pot
6 ptsOut of lives
10 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
11 ptsOut of lives

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

GPT-5.6 Sol 83.6/100Rank 5/48

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

Points per level

LevelCat Jam FreeGPT-5.6 Sol
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
18.8 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.

GPT-5.6 Sol

The central sphere and paint ordering are supported, but a frontal, centrally converging chamber replaces the required corner perspective. The first wall and floor images have incorrect placement and scale relationships. Sparse reflection cues remain, while continuous outer chains, open lateral sightlines, dense planar light sequences and curved nested spherical imagery are largely missing.

Score breakdown

CategoryCat Jam FreeGPT-5.6 Sol
State at 600 ms14.0/2523.0/25
Camera and placement4.0/156.0/15
Reflections3.5/12011.0/120
Materials and scale4.0/107.5/10
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-5.6 Sol

Six evenly spaced lobes, outward-facing heads and a clear central hexagon establish the requested knot. The ivory silhouette is controlled, but broad crossing bands resemble rigid strips, shading provides limited muscular volume, and repetitive scale lines extend across black loop openings. Small oval heads have readable eyes and mouths but limited anatomical character or moist surface detail.

Score breakdown

CategoryCat Jam FreeGPT-5.6 Sol
Task & likeness5.5/107.5/10
Anatomy & construction5.5/106.0/10
Space & placement6.0/107.0/10
Light & reflections6.0/105.0/10
Purposeful detail4.0/106.0/10
Artistry & character5.5/106.5/10
Materials & effects5.0/104.5/10
Visual integrity6.5/106.0/10

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-5.6 Sol

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-5.6 Sol

The crossed hands, dark dress and winding landscape establish the Mona Lisa composition. Replication is limited by enlarged eyes, an elongated face and a more frontal pose. Broad gradients suggest volume, but outlined features and flattened, overlapping fingers weaken the portrait. The frame and restrained palette unify the image; visible grain adds texture without convincing painterly transitions.

Score breakdown

CategoryCat Jam FreeGPT-5.6 Sol
Task & likeness2.5/104.5/10
Anatomy & construction2.0/104.0/10
Space & placement4.0/105.5/10
Light & reflections3.5/105.0/10
Purposeful detail3.0/105.0/10
Artistry & character3.0/104.5/10
Materials & effects2.5/105.5/10
Visual integrity5.5/106.5/10

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-5.6 Sol

The purple-to-gold sunset, framing palms and varied beach activities create an appealing, coherent illustration. The sun’s reflection establishes a clear focal path. Figures and animals are recognizable but geometrically simplified; airborne dolphins lack convincing splashes, and the boat reflection is schematic. Clean silhouettes and playful details succeed more strongly than anatomical depth or material realism.

Score breakdown

CategoryCat Jam FreeGPT-5.6 Sol
Task & likeness7.0/108.5/10
Anatomy & construction4.5/106.0/10
Space & placement4.5/107.0/10
Light & reflections4.0/106.5/10
Purposeful detail4.0/107.0/10
Artistry & character4.5/106.5/10
Materials & effects4.5/106.5/10
Visual integrity5.5/107.0/10

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.

GPT-5.6 Sol

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-5.6 Sol

Expressive faces, bold silhouettes and layered waves make an appealing cartoon. The raccoon sits convincingly behind the dog's shoulders, and the dog's forward paw reaches the steering grip. Steering construction and seated support remain somewhat ambiguous. The glowing sunset lacks a corresponding warm reflection or consistent illumination on the riders.

Score breakdown

CategoryCat Jam FreeGPT-5.6 Sol
Task & likeness6.0/106.5/10
Anatomy & construction5.0/105.0/10
Space & placement5.0/106.5/10
Light & reflections5.0/106.5/10
Purposeful detail6.0/107.5/10
Artistry & character5.0/105.0/10
Materials & effects5.0/107.0/10
Visual integrity4.5/105.0/10

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-5.6 Sol

The expressive pelican and balanced coastal composition remain appealing, but a sky-colored slit between the neck contours above the wing leaves the central anatomy incoherent. This visible construction and layering defect prevents a clean-integrity assessment. Clustered feet lack clear pedal contacts and the chain routing is schematic; lighting and water reflections remain graphic.

Score breakdown

CategoryCat Jam FreeGPT-5.6 Sol
Task & likeness7.0/108.5/10
Anatomy & construction5.0/105.0/10
Space & placement6.0/107.5/10
Light & reflections5.0/107.5/10
Purposeful detail5.5/108.0/10
Artistry & character5.5/106.5/10
Materials & effects6.5/107.0/10
Visual integrity6.5/104.5/10

Benchmark task

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