Cat Jam Free 33.8/100Rank 26/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Muse Spark Open leads Cat Jam Free by 10.6 points on StealthMark, 44.1 to 33.5. It leads on 6 of 9 benchmarks, including Latch, and Cat Jam Free on 3, including Foresight. Muse Spark Open scores higher on Ground Truth.
See the difference ↘On every task, result quality and reasoning tokens are each compared with all measured models and weighed equally. Each dot is one model.
BENCHMARK BY BENCHMARK
DATASHEET
Full datasheets, every price and sourceMuse Spark Open ↗
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.


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.


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


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.
Muse Spark Open
The airborne black blob and deformed paint support the broad contact sequence, although cyan attachment and wheel-directed transport remain partial. The sphere and black blob have substantial framing errors. The dominant limitation is the largely absent mirror system: faint wall circles and isolated highlights provide little evidence of recursive room geometry or curved nested reflections. Oversized compact paint features and diffuse material treatment further limit credit.
| Category | Cat Jam Free | Muse Spark Open |
|---|---|---|
| State at 600 ms | 14.0/25 | 14.0/25 |
| Camera and placement | 4.0/15 | 6.0/15 |
| Reflections | 3.5/120 | 8.0/120 |
| Materials and scale | 4.0/10 | 3.5/10 |
| Floor-damage reward | 0.0/10 | 0.0/10 |
A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.
Visual construction and creative interpretation.


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.
Muse Spark Open
The rounded silhouette and asymmetric expression make an appealing baby elephant, supported by a quiet background and grounding shadow. The protective action remains difficult to read: forefeet cannot be confidently traced into a grip, and seed contact is crowded by fine lines. Controlled simple shapes provide charm, but limited anatomical clarity, shading and surface detail leave the execution uneven.
| Category | Cat Jam Free | Muse Spark Open |
|---|---|---|
| Task & likeness | 5.5/10 | 5.0/10 |
| Anatomy & construction | 5.5/10 | 4.5/10 |
| Space & placement | 6.0/10 | 6.0/10 |
| Light & reflections | 6.0/10 | 5.0/10 |
| Purposeful detail | 4.0/10 | 6.0/10 |
| Artistry & character | 5.5/10 | 5.0/10 |
| Materials & effects | 5.0/10 | 5.0/10 |
| Visual integrity | 6.5/10 | 6.5/10 |
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.
Muse Spark Open
A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.
Precise visual recall and portrait reconstruction.


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.
Muse Spark Open
A recognizable, orderly interpretation with clean major contours, connected body forms and modest facial shading. Wide eyes, frontal symmetry and schematic hands limit likeness and expression. Layered scenery establishes basic depth, but shallow arm overlaps, flat clothing and sparse fine detail keep the execution basic and uneven.
| Category | Cat Jam Free | Muse Spark Open |
|---|---|---|
| Task & likeness | 2.5/10 | 3.0/10 |
| Anatomy & construction | 2.0/10 | 3.0/10 |
| Space & placement | 4.0/10 | 5.0/10 |
| Light & reflections | 3.5/10 | 4.5/10 |
| Purposeful detail | 3.0/10 | 4.0/10 |
| Artistry & character | 3.0/10 | 3.0/10 |
| Materials & effects | 2.5/10 | 4.0/10 |
| Visual integrity | 5.5/10 | 6.0/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


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.
Muse Spark Open
A coherent sunset beach with readable activities, balanced framing and controlled colour transitions. Small accessories add interest, but schematic anatomy, limited surface detail, weak directional shadows and a geometric reflection constrain its finish. Most shapes and overlaps remain clean.
| Category | Cat Jam Free | Muse Spark Open |
|---|---|---|
| Task & likeness | 7.0/10 | 8.0/10 |
| Anatomy & construction | 4.5/10 | 6.0/10 |
| Space & placement | 4.5/10 | 6.5/10 |
| Light & reflections | 4.0/10 | 5.5/10 |
| Purposeful detail | 4.0/10 | 6.5/10 |
| Artistry & character | 4.5/10 | 5.5/10 |
| Materials & effects | 4.5/10 | 6.0/10 |
| Visual integrity | 5.5/10 | 8.0/10 |
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Physical reasoning, light and visual reconstruction.


Cat Jam Free
This benchmark has not been assessed yet.
Muse Spark Open
This benchmark has not been assessed yet.
A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.
Scene composition and interacting subjects.


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.
Muse Spark Open
Expressive faces, distinct accessories and clean color separation make the scene appealing and recognizable. Character detail is stronger than the functional construction: steering contact, limb overlaps and seating remain ambiguous. The readable hull and lively spray establish motion, while limited directional shading and simplified surfaces constrain depth and physical coherence.
| Category | Cat Jam Free | Muse Spark Open |
|---|---|---|
| Task & likeness | 6.0/10 | 4.0/10 |
| Anatomy & construction | 5.0/10 | 3.0/10 |
| Space & placement | 5.0/10 | 6.0/10 |
| Light & reflections | 5.0/10 | 4.5/10 |
| Purposeful detail | 6.0/10 | 7.0/10 |
| Artistry & character | 5.0/10 | 3.5/10 |
| Materials & effects | 5.0/10 | 5.0/10 |
| Visual integrity | 4.5/10 | 5.0/10 |
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.
Subject construction and spatial relationships.


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.
Muse Spark Open
A controlled, appealing cartoon with a recognizable pelican, expressive face and clean curved forms. Feather lines, spokes and bill shading provide useful complexity. Aligned wheels and a ground shadow establish placement, but uncertain pedal contacts and obscured mechanical connections weaken support and riding action. Lighting remains loosely coordinated with the sun.
| Category | Cat Jam Free | Muse Spark Open |
|---|---|---|
| Task & likeness | 7.0/10 | 7.5/10 |
| Anatomy & construction | 5.0/10 | 5.0/10 |
| Space & placement | 6.0/10 | 6.0/10 |
| Light & reflections | 5.0/10 | 5.0/10 |
| Purposeful detail | 5.5/10 | 6.5/10 |
| Artistry & character | 5.5/10 | 5.5/10 |
| Materials & effects | 6.5/10 | 6.0/10 |
| Visual integrity | 6.5/10 | 7.5/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.