Muse Spark Open 29.4/100Rank 34/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Qwen3.8-27B leads Muse Spark Open by 7.6 points on StealthMark, 51.7 to 44.1. It leads on 7 of 9 benchmarks, including Foresight, and Muse Spark Open on 2, including Latch. Qwen3.8-27B scores higher on Newton's Mirror, with its largest category advantage in reflections.
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 runs 4.6× faster in our speed test. Qwen3.8-27B scores higher on StealthMark and is 2.5× cheaper per output token. Both take about 1M tokens of context.
Full datasheets, every price and sourceMuse Spark Open ↗Qwen3.8-27B ↗
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.
Qwen3.8-27B
The room fills the complete 16:9 frame without visible borders or labels. Central placement fits the wider frame, and the paint colors follow the expected vertical order. Bilateral side images, diminishing echoes and an overlapping floor image provide limited mirror depth. Broad sphere surfaces lack ordered nested room imagery, while planar panel sequences and outer chains remain missing or unresolved. Soft highlights do not establish emitter mapping, while paint attachment and transport history are only partly supported.
| Category | Muse Spark Open | Qwen3.8-27B |
|---|---|---|
| State at 600 ms | 14.0/25 | 23.0/25 |
| Camera and placement | 6.0/15 | 13.0/15 |
| Reflections | 8.0/120 | 24.0/120 |
| Materials and scale | 3.5/10 | 6.5/10 |
| 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.
Qwen3.8-27B
A cohesive emerald-and-gold illustration with a gentle expression, flowing robes, luminous halo and three clearly ringed orbs. Limbs remain connected, and the asymmetric legs communicate floating. The rounded face reads somewhat bear-like; the raised palm faces outward rather than upward, and chest-hand fingers are crowded. Clean ornamentation exceeds the comparatively simple anatomical modeling and shading.
| Category | Muse Spark Open | Qwen3.8-27B |
|---|---|---|
| Task & likeness | 5.0/10 | 8.0/10 |
| Anatomy & construction | 4.5/10 | 7.5/10 |
| Space & placement | 6.0/10 | 8.0/10 |
| Light & reflections | 5.0/10 | 7.5/10 |
| Purposeful detail | 6.0/10 | 8.0/10 |
| Artistry & character | 5.0/10 | 7.5/10 |
| Materials & effects | 5.0/10 | 7.5/10 |
| Visual integrity | 6.5/10 | 8.5/10 |
Muse Spark Open
A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.
Qwen3.8-27B
A floating capybara in ornate robes tests character anatomy, layered fabric and the placement of surrounding luminous 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.
Qwen3.8-27B
The centered portrait, dark clothing and overlapping hands evoke the Mona Lisa, but replication is weak. The face is excessively elongated, the eyes stare broadly, and the hands reduce to rounded masses with shallow finger marks. Soft shading creates some volume, while the landscape remains indistinct. The precise gold frame is more resolved than the portrait.
| Category | Muse Spark Open | Qwen3.8-27B |
|---|---|---|
| Task & likeness | 3.0/10 | 4.0/10 |
| Anatomy & construction | 3.0/10 | 4.5/10 |
| Space & placement | 5.0/10 | 4.5/10 |
| Light & reflections | 4.5/10 | 5.0/10 |
| Purposeful detail | 4.0/10 | 5.0/10 |
| Artistry & character | 3.0/10 | 5.0/10 |
| Materials & effects | 4.0/10 | 5.0/10 |
| Visual integrity | 6.0/10 | 5.0/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


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.
Qwen3.8-27B
The sweeping palm, glowing sunset and purple-to-orange palette create an appealing beach composition. Birds, animals and reflections fulfill the brief, with clean silhouettes and readable small accents. Schematic anatomy, repetitive shoreline geometry and limited perspective integration constrain depth. Foreground lighting and uniform reflection bars provide atmosphere but little physical coherence.
| Category | Muse Spark Open | Qwen3.8-27B |
|---|---|---|
| Task & likeness | 8.0/10 | 8.5/10 |
| Anatomy & construction | 6.0/10 | 6.5/10 |
| Space & placement | 6.5/10 | 6.0/10 |
| Light & reflections | 5.5/10 | 6.0/10 |
| Purposeful detail | 6.5/10 | 7.0/10 |
| Artistry & character | 5.5/10 | 7.0/10 |
| Materials & effects | 6.0/10 | 6.5/10 |
| Visual integrity | 8.0/10 | 7.0/10 |
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.
Qwen3.8-27B
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.
Qwen3.8-27B
The raccoon clearly rides on the dog's back, and the dog reaches the jet ski's steering grip. Cheerful expressions, a bright palette and sweeping wake make the action readable. Anatomy and machinery remain simplified, with overlapping paws and limited seat definition. Flat lighting, sparse surface detail and broad white splash shapes limit depth and finish. A clipped gray fragment interrupts the upper-left corner.
| Category | Muse Spark Open | Qwen3.8-27B |
|---|---|---|
| Task & likeness | 4.0/10 | 8.5/10 |
| Anatomy & construction | 3.0/10 | 6.5/10 |
| Space & placement | 6.0/10 | 7.0/10 |
| Light & reflections | 4.5/10 | 5.5/10 |
| Purposeful detail | 7.0/10 | 6.5/10 |
| Artistry & character | 3.5/10 | 6.5/10 |
| Materials & effects | 5.0/10 | 6.5/10 |
| Visual integrity | 5.0/10 | 7.5/10 |
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.
Qwen3.8-27B
The pelican’s oversized bill, straw hat and flowing scarf create a distinctive focal character against a well-composed coastal sunset. Wheels and frame are readable, but the wings do not reach the steering, overlapping legs obscure separate pedal contacts, and the crank linkage is unclear. Clean vector shapes and restrained shading support an appealing illustration with limited physical depth.
| Category | Muse Spark Open | Qwen3.8-27B |
|---|---|---|
| Task & likeness | 7.5/10 | 8.0/10 |
| Anatomy & construction | 5.0/10 | 5.5/10 |
| Space & placement | 6.0/10 | 7.0/10 |
| Light & reflections | 5.0/10 | 7.0/10 |
| Purposeful detail | 6.5/10 | 7.5/10 |
| Artistry & character | 5.5/10 | 7.5/10 |
| Materials & effects | 6.0/10 | 6.5/10 |
| Visual integrity | 7.5/10 | 8.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.