Muse Spark Open 29.4/100Rank 34/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Muse Spark Open leads LongCat-2.0 by 18.6 points on StealthMark, 44.1 to 25.5. It leads on 4 of the 7 benchmarks with results for both and LongCat-2.0 on 3. 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
Muse Spark Open scores higher on StealthMark and runs 4.2× faster in our speed test. LongCat-2.0 is 3.5× cheaper per output token. Both take about 1M tokens of context.
Full datasheets, every price and sourceMuse Spark Open ↗LongCat-2.0 ↗
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 ↗


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.
LongCat-2.0
Cyan lies on the sphere's facing middle rather than showing its recent interaction near the apex. Separate airborne black and elongated crimson support part of the timing sequence. Small side images and an overlapping lower image provide limited reflection ordering, but recursive room structure, nested imagery and emitter mappings are largely absent. The main sphere is smaller and higher in the frame than prescribed, and the surfaces have a soft, matte appearance.
| Category | Muse Spark Open | LongCat-2.0 |
|---|---|---|
| State at 600 ms | 14.0/25 | 9.5/25 |
| Camera and placement | 6.0/15 | 6.5/15 |
| Reflections | 8.0/120 | 12.5/120 |
| Materials and scale | 3.5/10 | 5.5/10 |
| 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.


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.
LongCat-2.0
Amber slit eyes, a pointed beak, cream feathers and gold-trimmed black clothing establish the secretive owl rogue. The head appears frontal rather than lowered, with much of the face exposed. The centered silhouette is effective, but stiff cloak geometry, shallow facial modeling and extremely dark clothing limit depth and finish. Sparse gold markings suggest the requested circuitry only loosely.
| Category | Muse Spark Open | LongCat-2.0 |
|---|---|---|
| Task & likeness | 5.0/10 | 7.0/10 |
| Anatomy & construction | 4.5/10 | 6.0/10 |
| Space & placement | 6.0/10 | 6.0/10 |
| Light & reflections | 5.0/10 | 5.5/10 |
| Purposeful detail | 6.0/10 | 6.0/10 |
| Artistry & character | 5.0/10 | 6.5/10 |
| Materials & effects | 5.0/10 | 5.5/10 |
| Visual integrity | 6.5/10 | 6.5/10 |
Muse Spark Open
A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.
LongCat-2.0
A cloaked owl with luminous eyes tests expression, fabric folds and the separation of dark forms.
Precise visual recall and portrait reconstruction.


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.
LongCat-2.0
The centered portrait, slight smile, overlapping hands and distant landscape suggest Mona Lisa, but replication is weak. The face has little volume, the shoulders and torso form a narrow wedge, and the hands are fingerless ovals with unresolved wrists. Broad gray background bands provide limited depth. A bright head rim and pale hands contrast with an almost featureless dark figure.
| Category | Muse Spark Open | LongCat-2.0 |
|---|---|---|
| Task & likeness | 3.0/10 | 0.5/10 |
| Anatomy & construction | 3.0/10 | 0.5/10 |
| Space & placement | 5.0/10 | 0.5/10 |
| Light & reflections | 4.5/10 | 0.5/10 |
| Purposeful detail | 4.0/10 | 0.0/10 |
| Artistry & character | 3.0/10 | 0.5/10 |
| Materials & effects | 4.0/10 | 0.0/10 |
| Visual integrity | 6.0/10 | 0.5/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


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.
LongCat-2.0
The sunset, palms, birds and beach animals create a cheerful, readable scene. Clean silhouettes and a vivid sky establish the composition, but construction remains schematic. The right palm appears rooted in open water, shadows have limited connection to the sunset, and the sun’s reflection consists of rigid bands. Small creatures and beach equipment are recognizable but minimally developed.
| Category | Muse Spark Open | LongCat-2.0 |
|---|---|---|
| Task & likeness | 8.0/10 | 7.5/10 |
| Anatomy & construction | 6.0/10 | 5.5/10 |
| Space & placement | 6.5/10 | 5.5/10 |
| Light & reflections | 5.5/10 | 6.0/10 |
| Purposeful detail | 6.5/10 | 5.0/10 |
| Artistry & character | 5.5/10 | 5.0/10 |
| Materials & effects | 6.0/10 | 3.0/10 |
| Visual integrity | 8.0/10 | 4.0/10 |
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Physical reasoning, light and visual reconstruction.


Muse Spark Open
This benchmark has not been assessed yet.
LongCat-2.0
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.


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.
LongCat-2.0
The raccoon is recognizable and expressive, with a clear mask and striped tail. The dog's anatomy is poorly resolved, and the flattened craft lacks convincing steering and seating. Feet extend below the hull, weakening the sense of support. An appealing palette, clean shapes and decorative water effects give the illustration some polish.
| Category | Muse Spark Open | LongCat-2.0 |
|---|---|---|
| Task & likeness | 4.0/10 | 4.0/10 |
| Anatomy & construction | 3.0/10 | 3.0/10 |
| Space & placement | 6.0/10 | 4.5/10 |
| Light & reflections | 4.5/10 | 5.5/10 |
| Purposeful detail | 7.0/10 | 6.0/10 |
| Artistry & character | 3.5/10 | 3.0/10 |
| Materials & effects | 5.0/10 | 5.5/10 |
| Visual integrity | 5.0/10 | 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.


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.
LongCat-2.0
A clearly recognizable pelican cycles through a well-composed coastal sunset. Warm colors, flowing scarf, feather contours and bicycle details give the illustration character. The legs connect to the body, but the farther foot's pedal contact and the wing's handlebar grip remain ambiguous. Clean vector shapes provide polish, with limited material texture and directional shading.
| Category | Muse Spark Open | LongCat-2.0 |
|---|---|---|
| Task & likeness | 7.5/10 | 8.5/10 |
| Anatomy & construction | 5.0/10 | 7.0/10 |
| Space & placement | 6.0/10 | 8.0/10 |
| Light & reflections | 5.0/10 | 7.5/10 |
| Purposeful detail | 6.5/10 | 8.0/10 |
| Artistry & character | 5.5/10 | 8.5/10 |
| Materials & effects | 6.0/10 | 7.0/10 |
| Visual integrity | 7.5/10 | 8.5/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.