STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Cat Jam Free vs GPT-6 Luna

GPT-6 Luna leads Cat Jam Free by 5.6 points on StealthMark, 39.1 to 33.5. It leads on 6 of 9 benchmarks, including Latch, and Cat Jam Free on 3, including Foresight. GPT-6 Luna 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
39.1/100Overall rank 35/53

General Intelligence

27.7/100
31.3/100

Visual Intelligence

43.0/100
52.0/100

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

Open or local

NeitherApache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Cat Jam Free
  • GPT-6 Luna
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Cat Jam Free
  • GPT-6 Luna
  • Other models
  • Median
PricePer 1M output tokens, input below
Cat Jam Free: No list priceGPT-6 Luna: $0.50$0.10 input
Context windowTokens per request, max output below
Cat Jam Free: Not publishedGPT-6 Luna: 1.05M128K max output
Output speedTokens per second, our measurement
Cat Jam Free: Not measuredGPT-6 Luna: 131tokens/s
Developer
Not publishedOpenAI
Released
Not published22 Sep 2026
Origin
Not publishedUnited States
Input → output
Not publishedText, image → text

Full datasheets, every price and sourceGPT-6 Luna ↗

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-6 Luna 29.8/100Rank 32/47

Survived 0 of 3
Foresight: complete playing field
Level 36 ptsTurn 7 / 20

Points per level

LevelCat Jam FreeGPT-6 Luna
Level 1Second Thoughts
5 ptsOut of lives
15 ptsOut of lives
Level 2Pressure Pot
6 ptsOut of lives
5 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
6 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-6 Luna 44.0/100Rank 25/48

Cleared 4 of 5
Latch: complete playing field
Level 513 ptsTurn 15 / 40

Points per level

LevelCat Jam FreeGPT-6 Luna
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
8.8 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
10 ptsFinished early
17 ptsCleared1 beacon left
Level 4Passing bay
10.8 ptsFinished early
15.8 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
6 ptsFinished early
13 ptsFinished early

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-6 Luna

The schematic scene supports the paint contact order and compact paint scale. Its low, undersized main sphere and incorrectly placed wall images depart from the reference geometry. A few shrinking wall images provide limited optical organization, while absent lateral recursion and outer chains, broad sphere ribbons and isolated panel highlights leave most nested room and emitter mapping undeveloped.

Score breakdown

CategoryCat Jam FreeGPT-6 Luna
State at 600 ms14.0/2522.0/25
Camera and placement4.0/153.5/15
Reflections3.5/1205.0/120
Materials and scale4.0/107.0/10
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-6 Luna

Sixfold symmetry, pale coloring and six outward-facing heads establish the motif. However, every neck floats clear of the knot. Squared outer sections replace the required semicircular lobes, and the large stepped opening lacks a regular hexagonal contour. Repeated scales and soft shading suggest skin, but translucent crossings and doubled edges weaken the living, interwoven construction.

Score breakdown

CategoryCat Jam FreeGPT-6 Luna
Task & likeness5.5/104.5/10
Anatomy & construction5.5/103.5/10
Space & placement6.0/105.5/10
Light & reflections6.0/105.0/10
Purposeful detail4.0/105.0/10
Artistry & character5.5/105.0/10
Materials & effects5.0/105.0/10
Visual integrity6.5/104.5/10

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.

GPT-6 Luna

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-6 Luna

The dark veil, crossed arms, restrained smile and layered landscape clearly evoke Mona Lisa. Clean contours and muted colors create a coherent illustration. Replication is limited by enlarged, outlined eyes, simplified facial volume, broad shoulders and indistinct overlapping hands. Gradients suggest depth, but lack the original's subtle painterly transitions.

Score breakdown

CategoryCat Jam FreeGPT-6 Luna
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 & effects2.5/105.0/10
Visual integrity5.5/106.0/10

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.

GPT-6 Luna

The warm sky, layered sea and framing palms create an appealing beach composition. Animals, birds, toys and reflected sunlight fulfill the brief. Human anatomy remains schematic, and simplified figures offer limited expression. Missing shadows and the dolphin's splashless jump weaken physical grounding, while clean silhouettes and readable small details support the illustration.

Score breakdown

CategoryCat Jam FreeGPT-6 Luna
Task & likeness7.0/107.5/10
Anatomy & construction4.5/105.0/10
Space & placement4.5/107.5/10
Light & reflections4.0/105.0/10
Purposeful detail4.0/107.0/10
Artistry & character4.5/105.0/10
Materials & effects4.5/106.5/10
Visual integrity5.5/106.0/10

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-6 Luna

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-6 Luna

Expressive faces, warm sunset colors and clean silhouettes create an appealing illustration. The raccoon sits on the dog's back, but the dog's grip and steering linkage remain unclear. The broad hull resembles a speedboat, and flat shading, absent sun reflections and modest water displacement limit depth and motion.

Score breakdown

CategoryCat Jam FreeGPT-6 Luna
Task & likeness6.0/108.0/10
Anatomy & construction5.0/105.5/10
Space & placement5.0/107.5/10
Light & reflections5.0/106.0/10
Purposeful detail6.0/107.0/10
Artistry & character5.0/105.5/10
Materials & effects5.0/106.5/10
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-6 Luna

The pelican’s distinctive bill and the coordinated vintage poster palette make an appealing illustration. Circular wheels, orderly spokes and clean lettering strengthen the design. Riding mechanics are less convincing: neither wing reaches the handlebars, pedal contact is ambiguous, and the drivetrain is incomplete. The wheels sit against water without a clear supporting surface. Flat lighting limits volume.

Score breakdown

CategoryCat Jam FreeGPT-6 Luna
Task & likeness7.0/108.0/10
Anatomy & construction5.0/105.0/10
Space & placement6.0/106.5/10
Light & reflections5.0/106.5/10
Purposeful detail5.5/107.5/10
Artistry & character5.5/106.5/10
Materials & effects6.5/106.5/10
Visual integrity6.5/107.0/10

Benchmark task

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