Muse Spark Open 29.4/100Rank 34/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) leads Muse Spark Open by 18.5 points on StealthMark, 62.6 to 44.1. It leads on 8 of 9 benchmarks, including Foresight, and Muse Spark Open on 1, including Latch. Union Alpha 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 takes 4× more context and runs 14× faster in our speed test. Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) scores higher on StealthMark.
Full datasheets, every price and sourceMuse Spark Open ↗Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) ↗
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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
Recognizable near-field sphere placement and bilateral convergence provide limited optical structure. Broad gray regions interrupt lateral sightlines and truncate side-floor images. Missing outer chains, absent nested sphere imagery and incomplete planar and curved emitter mappings dominate the reflection system.
| Category | Muse Spark Open | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| State at 600 ms | 14.0/25 | 24.0/25 |
| Camera and placement | 6.0/15 | 13.5/15 |
| Reflections | 8.0/120 | 34.5/120 |
| Materials and scale | 3.5/10 | 10.0/10 |
| 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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
A strong futuristic emblem with clear hierarchy, controlled negative space and distinctive typography. Silver and gunmetal layers give the sweeping ribbons convincing graphic depth, while red accents remain restrained. Ambiguous concealed connections and occasionally abrupt highlight bands limit the construction and material realism.
| Category | Muse Spark Open | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 5.0/10 | 9.0/10 |
| Anatomy & construction | 4.5/10 | 7.5/10 |
| Space & placement | 6.0/10 | 8.5/10 |
| Light & reflections | 5.0/10 | 7.5/10 |
| Purposeful detail | 6.0/10 | 7.0/10 |
| Artistry & character | 5.0/10 | 7.5/10 |
| Materials & effects | 5.0/10 | 7.5/10 |
| Visual integrity | 6.5/10 | 7.0/10 |
Muse Spark Open
A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
An interwoven metallic emblem tests ribbon geometry, overlapping forms and the appearance of reflective metal against a dark background.
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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
The centered portrait, folded hands, dark clothing and hazy landscape clearly evoke the Mona Lisa. Muted colors and soft facial shading create a coherent illustration, but replication remains schematic: the face is broad, eyes outlined, smile simplified and overlapping fingers poorly resolved. Angular landscape shapes and flat fabric limit depth and painterly richness.
| Category | Muse Spark Open | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 3.0/10 | 6.5/10 |
| Anatomy & construction | 3.0/10 | 5.0/10 |
| Space & placement | 5.0/10 | 6.5/10 |
| Light & reflections | 4.5/10 | 6.0/10 |
| Purposeful detail | 4.0/10 | 5.5/10 |
| Artistry & character | 3.0/10 | 6.5/10 |
| Materials & effects | 4.0/10 | 5.0/10 |
| Visual integrity | 6.0/10 | 7.0/10 |
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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
A cohesive sunset palette, sweeping shoreline and playful animals make an appealing beach illustration. The sun’s reflection establishes a clear focal axis, balanced by the palm and umbrella. Clean silhouettes and small decorative features reward inspection, though simplified anatomy, repetitive reflection bars and generic oval shadows limit volume and naturalism.
| Category | Muse Spark Open | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 8.0/10 | 9.0/10 |
| Anatomy & construction | 6.0/10 | 7.0/10 |
| Space & placement | 6.5/10 | 8.0/10 |
| Light & reflections | 5.5/10 | 7.0/10 |
| Purposeful detail | 6.5/10 | 7.0/10 |
| Artistry & character | 5.5/10 | 6.0/10 |
| 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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
Expressive animals, a readable riding arrangement and sweeping spray create an appealing cartoon. The raccoon sits convincingly on the dog's back, but the dog's paw does not clearly grip the handlebar, whose connection to the hull is unresolved. Flat lighting provides little volume or reflection. A dark rectangular strip interrupts the upper-right background.
| Category | Muse Spark Open | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 4.0/10 | 8.0/10 |
| Anatomy & construction | 3.0/10 | 6.5/10 |
| Space & placement | 6.0/10 | 7.5/10 |
| Light & reflections | 4.5/10 | 5.5/10 |
| Purposeful detail | 7.0/10 | 7.0/10 |
| Artistry & character | 3.5/10 | 7.0/10 |
| Materials & effects | 5.0/10 | 7.5/10 |
| Visual integrity | 5.0/10 | 7.0/10 |
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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
The pelican is immediately recognizable, with an expressive face, convincing bill silhouette and appealing pastel composition. Both legs connect to feet, and the wing reaches the handlebar. Bicycle construction is less resolved: the far pedal lacks a clear crank connection and no chain is visible. Clean contours and orderly spokes support the illustration, while flat lighting and simplified surfaces limit depth.
| Category | Muse Spark Open | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 7.5/10 | 8.0/10 |
| Anatomy & construction | 5.0/10 | 6.0/10 |
| Space & placement | 6.0/10 | 7.0/10 |
| Light & reflections | 5.0/10 | 6.0/10 |
| Purposeful detail | 6.5/10 | 6.0/10 |
| Artistry & character | 5.5/10 | 6.0/10 |
| Materials & effects | 6.0/10 | 6.0/10 |
| Visual integrity | 7.5/10 | 8.5/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.