Muse Spark Open 29.4/100Rank 34/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Muse Spark Open leads Nemotron 3 Ultra by 27.4 points on StealthMark, 44.1 to 16.7. It leads on all 9 benchmarks. 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 2.6× faster in our speed test. Nemotron 3 Ultra is 1.8× cheaper per output token. Both take about 1M tokens of context.
Full datasheets, every price and sourceMuse Spark Open ↗Nemotron 3 Ultra ↗
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.
Nemotron 3 Ultra
The candidate establishes a separate airborne black blob and partial crimson overlap, but leaves the paint interaction history and settled support unresolved. Its main silhouette, black placement and lamp projection depart substantially from the required camera geometry. A few faint reflection hints provide little support for the extensive mirror system, while the compact paint volumes are visibly disproportionate.
| Category | Muse Spark Open | Nemotron 3 Ultra |
|---|---|---|
| State at 600 ms | 14.0/25 | 2.0/25 |
| Camera and placement | 6.0/15 | 3.5/15 |
| Reflections | 8.0/120 | 4.5/120 |
| Materials and scale | 3.5/10 | 3.0/10 |
| 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.
Nemotron 3 Ultra
An endearing mechanical creature is clearly framed, with expressive amber eyes and readable segmented arms. The shell resembles layered green plates more than a deep coiled spiral. Detached-looking construction, absent working contacts and patchy rendering leave the central assembly action substantially unresolved.
| Category | Muse Spark Open | Nemotron 3 Ultra |
|---|---|---|
| Task & likeness | 5.0/10 | 4.0/10 |
| Anatomy & construction | 4.5/10 | 4.0/10 |
| Space & placement | 6.0/10 | 5.5/10 |
| Light & reflections | 5.0/10 | 5.0/10 |
| Purposeful detail | 6.0/10 | 4.0/10 |
| Artistry & character | 5.0/10 | 3.0/10 |
| Materials & effects | 5.0/10 | 4.0/10 |
| Visual integrity | 6.5/10 | 4.5/10 |
Muse Spark Open
A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.
Nemotron 3 Ultra
A hovering mechanical nautilus tests spiral construction, connected mechanical forms and contrasting metal and illuminated surfaces.
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.
Nemotron 3 Ultra
The centered silhouette provides basic organization, but multicolored mottling and geometric overlays leave the portrait unresolved. No readable face, crossed hands, clothing or landscape establishes Mona Lisa replication. Texture and transparency offer limited visual effects without coherent anatomy, lighting or material distinctions.
| Category | Muse Spark Open | Nemotron 3 Ultra |
|---|---|---|
| Task & likeness | 3.0/10 | 0.5/10 |
| Anatomy & construction | 3.0/10 | 0.0/10 |
| Space & placement | 5.0/10 | 1.0/10 |
| Light & reflections | 4.5/10 | 0.5/10 |
| Purposeful detail | 4.0/10 | 0.5/10 |
| Artistry & character | 3.0/10 | 1.5/10 |
| 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.
Nemotron 3 Ultra
A recognizable beach illustration with appealing warm-cool contrast, readable layers and mostly clean shapes. Unresolved seat construction, schematic animals and broad geometric foliage give it an elementary finish. Weakly coordinated reflections and limited material differentiation further constrain depth and atmosphere.
| Category | Muse Spark Open | Nemotron 3 Ultra |
|---|---|---|
| Task & likeness | 8.0/10 | 6.5/10 |
| Anatomy & construction | 6.0/10 | 3.0/10 |
| Space & placement | 6.5/10 | 5.0/10 |
| Light & reflections | 5.5/10 | 1.5/10 |
| Purposeful detail | 6.5/10 | 4.5/10 |
| Artistry & character | 5.5/10 | 3.0/10 |
| Materials & effects | 6.0/10 | 2.5/10 |
| Visual integrity | 8.0/10 | 6.5/10 |
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.
Nemotron 3 Ultra
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.
Nemotron 3 Ultra
The masked raccoon, dog and orange craft make the scene recognizable, with an appealing sunset palette. Overlapping bodies obscure the riding relationship, and the dog's connection to the controls remains unresolved. Weak water displacement, inconsistent shading and visible shape artifacts limit the finish. Ambiguous attachments do not establish detached limbs or inverted anatomy.
| Category | Muse Spark Open | Nemotron 3 Ultra |
|---|---|---|
| Task & likeness | 4.0/10 | 3.5/10 |
| Anatomy & construction | 3.0/10 | 1.5/10 |
| Space & placement | 6.0/10 | 4.5/10 |
| Light & reflections | 4.5/10 | 2.0/10 |
| Purposeful detail | 7.0/10 | 3.5/10 |
| Artistry & character | 3.5/10 | 1.5/10 |
| Materials & effects | 5.0/10 | 3.0/10 |
| Visual integrity | 5.0/10 | 2.0/10 |
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.
Nemotron 3 Ultra
A recognizable, playful pelican dominates a readable bicycle scene. Its bill and silhouette succeed, but feet below the pedals and confused drivetrain connections weaken the riding action. Local material modeling adds interest; overlapping contours, repetitive detail and inconsistent shadows leave the illustration basic and uneven.
| Category | Muse Spark Open | Nemotron 3 Ultra |
|---|---|---|
| Task & likeness | 7.5/10 | 4.0/10 |
| Anatomy & construction | 5.0/10 | 3.5/10 |
| Space & placement | 6.0/10 | 3.5/10 |
| Light & reflections | 5.0/10 | 4.0/10 |
| Purposeful detail | 6.5/10 | 5.5/10 |
| Artistry & character | 5.5/10 | 4.0/10 |
| Materials & effects | 6.0/10 | 6.0/10 |
| Visual integrity | 7.5/10 | 3.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.