Muse Spark 1.3 64.3/100Rank 6/49

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Muse Spark 1.3 leads Step 5 Preview by 0.8 points on StealthMark, 39.8 to 39.0. It leads on 6 of 9 benchmarks, including both games, and Step 5 Preview on 3. Step 5 Preview 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
Both take about 1M tokens of context.
Full datasheets, every price and sourceMuse Spark 1.3 ↗Step 5 Preview ↗
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 1.3
The paint state is incorrectly and poorly drawn, despite a recognizable sphere-and-paint setup. The oversized sphere, oversized compact paint bodies, and blurred wall and floor images further limit the result. Isolated reflection cues provide very little support for the required repeated virtual rooms, nested spherical imagery or emitter mapping.
Step 5 Preview
The main sphere, airborne black and small colored features occupy broadly appropriate positions. Most of the defining mirror system is absent, and paint interaction remains only partially supported. The small paint features do not visibly establish a separate volume-scale violation.
| Category | Muse Spark 1.3 | Step 5 Preview |
|---|---|---|
| State at 600 ms | 6.0/25 | 20.0/25 |
| Camera and placement | 8.5/15 | 13.5/15 |
| Reflections | 5.5/120 | 20.0/120 |
| Materials and scale | 4.0/10 | 7.0/10 |
| 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 1.3
The luminous creature and geometric mirror counterpart communicate self-recognition through a coherent palette and expressive eyes. The transformed reflection is purposeful. Simple oval anatomy, ambiguous reaching-arm construction, shallow spatial staging and limited illumination of nearby surfaces keep the illustration below exceptional execution.
Step 5 Preview
A charming diagonal climber and warm palette communicate the central idea. Simple rounded construction, crowded limb counting, uncertain footholds and an unattached upper shelf limit its physical coherence. Growth bands and the yarn trail add specificity, but the requested material distinctions and unravelled bootie remain underdeveloped.
| Category | Muse Spark 1.3 | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.0/10 | 6.0/10 |
| Anatomy & construction | 5.0/10 | 4.5/10 |
| Space & placement | 6.5/10 | 5.0/10 |
| Light & reflections | 7.0/10 | 5.5/10 |
| Purposeful detail | 6.5/10 | 5.5/10 |
| Artistry & character | 5.5/10 | 5.0/10 |
| Materials & effects | 6.5/10 | 6.0/10 |
| Visual integrity | 7.5/10 | 5.0/10 |
Muse Spark 1.3
An imagined creature encounters its reflection. The scene tests original character design, visual self-interpretation and the relationship between a subject and its reflected image.
Step 5 Preview
Character scenes test expression, anatomy, materials and coherent visual construction.
Precise visual recall and portrait reconstruction.


Muse Spark 1.3
Dark hair, a restrained smile and overlapping hands suggest Mona Lisa, but replication is weak. The face is markedly elongated, the hands are oval pads with faint finger strokes, and the atmospheric landscape is absent. Soft gradients provide basic volume, while the frontal symmetry, shallow space and sparse clothing detail limit the portrait’s drawing quality.
Step 5 Preview
A recognizable, coherent simplification with purposeful facial contours and differentiated fingers. These provide more construction and detail than the broad silhouette alone suggests. The oversized face, frontal seated pose, unresolved wrists and sparse landscape still substantially limit likeness, depth and finish.
| Category | Muse Spark 1.3 | Step 5 Preview |
|---|---|---|
| Task & likeness | 1.0/10 | 4.0/10 |
| Anatomy & construction | 1.5/10 | 4.0/10 |
| Space & placement | 1.5/10 | 4.0/10 |
| Light & reflections | 1.5/10 | 3.5/10 |
| Purposeful detail | 1.0/10 | 4.0/10 |
| Artistry & character | 1.5/10 | 4.0/10 |
| Materials & effects | 1.5/10 | 3.0/10 |
| Visual integrity | 3.0/10 | 3.5/10 |
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 1.3
The warm sunset, framing palms and colorful beach accessories create an appealing scene with the requested animals, birds and reflections. Construction remains schematic: the raised hand misses the kite string, and a doglike silhouette hangs above the water without clear support. The sun reflection establishes a focal path, but shadows and materials lack depth. An unexplained horizontal bar crosses the sun.
Step 5 Preview
A recognizable sunset beach with clear warm-cool contrast and playful accessories. Basic animal construction, shallow foreground placement and schematic reflections limit spatial and physical credibility. Sparse descriptive detail and abruptly ended sky bands constrain the finish.
| Category | Muse Spark 1.3 | Step 5 Preview |
|---|---|---|
| Task & likeness | 6.5/10 | 4.0/10 |
| Anatomy & construction | 3.0/10 | 3.0/10 |
| Space & placement | 5.5/10 | 3.5/10 |
| Light & reflections | 6.5/10 | 3.5/10 |
| Purposeful detail | 5.0/10 | 3.0/10 |
| Artistry & character | 3.5/10 | 3.0/10 |
| Materials & effects | 3.0/10 | 3.5/10 |
| Visual integrity | 3.5/10 | 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 1.3
This benchmark has not been assessed yet.
Step 5 Preview
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 1.3
The raccoon clearly rides on the dog's back, and the dog's paws reach the jet ski controls. Expressive faces and bright colors make the scene appealing. Simplified joints, crowded steering geometry and shallow hull perspective limit construction. The sun has no corresponding water reflection, and the splash shapes convey speed more clearly than convincing displacement.
Step 5 Preview
Recognizable animals, a bright palette and identifying accessories support a basic cartoon. Primitive anatomy, partial seated support, unresolved steering and weak hull-water contact limit the central action. Lighting and spray provide atmosphere without establishing convincing physical depth.
| Category | Muse Spark 1.3 | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.5/10 | 4.0/10 |
| Anatomy & construction | 6.5/10 | 4.5/10 |
| Space & placement | 7.0/10 | 3.0/10 |
| Light & reflections | 5.0/10 | 3.5/10 |
| Purposeful detail | 6.5/10 | 4.0/10 |
| Artistry & character | 5.5/10 | 3.5/10 |
| Materials & effects | 6.0/10 | 3.0/10 |
| Visual integrity | 7.5/10 | 3.0/10 |
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 1.3
The pelican and bicycle are immediately recognizable, with an expressive face, bold bill and cheerful composition. Both legs connect to the body and reach pedal-like supports, but articulation, saddle support and wing contact with the handlebar remain unclear. Wheel alignment and layering are coherent. Simple landscape shapes, generic shadows and limited material variation constrain the finish.
Step 5 Preview
The pelican and bicycle are recognizable, with a pleasant palette and basic diffuse shading. The riding relationship fails physically: the bird is unsupported, the front wheel is unmounted, and pedalling is unresolved. Simple geometric construction and sparse material treatment further limit the drawing.
| Category | Muse Spark 1.3 | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.5/10 | 3.0/10 |
| Anatomy & construction | 6.0/10 | 3.0/10 |
| Space & placement | 7.0/10 | 3.0/10 |
| Light & reflections | 6.0/10 | 3.0/10 |
| Purposeful detail | 7.0/10 | 4.0/10 |
| Artistry & character | 5.5/10 | 3.0/10 |
| Materials & effects | 6.5/10 | 3.0/10 |
| Visual integrity | 7.0/10 | 2.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.