STEALTHMARK · HEAD TO HEAD
All comparisons ↗MISSINGNO. vs Muse Spark Open
Muse Spark Open leads MISSINGNO. by 5.4 points on StealthMark, 44.1 to 38.7. It leads on 5 of the 7 benchmarks with results for both and MISSINGNO. on 2. MISSINGNO. scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.
See the difference ↘Overall StealthMark
General Intelligence
Visual Intelligence
Reasoning efficiency
On every task, result quality and reasoning tokens are each compared with all measured models and weighed equally. Each dot is one model.
Single-step reasoning Result quality weighed against reasoning tokens on a single problem
Multi-step reasoning Result quality weighed against reasoning tokens across connected steps, as in agentic workflows
- MISSINGNO.Multi-step reasoning not measured
- Muse Spark Open
BENCHMARK BY BENCHMARK
Where each model leads
- MISSINGNO.
- Muse Spark Open
- Other models
- Median
Games
SVG
DATASHEET
Specs and pricing
MISSINGNO. runs 2.3× faster in our speed test. Muse Spark Open scores higher on StealthMark.
- MISSINGNO.
- Muse Spark Open
- Other models
- Median
- Developer
- Not publishedMeta
- Released
- Not published15 Oct 2026
- Origin
- Not publishedUnited States
- Input → output
- Not publishedText, image, audio, video → text
- Architecture
- Not publishedSparse mixture-of-experts Transformer with perception encoders; 62 decoder layers, 256 experts with 8 selected per token, grouped-query attention and sliding-window/full-attention layers.
Full datasheets, every price and sourceMuse Spark Open ↗
Foresight
Play Foresight yourselfAnticipating 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.
Muse Spark Open 29.4/100Rank 34/47

Points per level
Latch
Play Latch yourselfCooperative 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.
MISSINGNO.No run
Muse Spark Open 75.7/100Rank 12/48

Points per level
Newton's Mirror
Same task instructionsPhysics, perspective and recursive reflections, tested together. Explore the test ↗
MISSINGNO. 27.8/100 Rank 28/53

Muse Spark Open 19.6/100 Rank 39/53

The judgment
MISSINGNO.
The centered sphere, separate airborne black blob and cyan-above-crimson ordering provide limited valid structure. The colored beads do not establish the required impact and transport histories. One dim floor image supports a small part of the optical system, while the defining wall repetitions, nested sphere imagery and emitter mappings are missing. Rounded volume and some gloss earn material credit, tempered by soft surface appearance and excessive paint-bead scale.
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.
Score breakdown
| Category | MISSINGNO. | Muse Spark Open |
|---|---|---|
| State at 600 ms | 19.0/25 | 14.0/25 |
| Camera and placement | 7.0/15 | 6.0/15 |
| Reflections | 12.0/120 | 8.0/120 |
| Materials and scale | 5.5/10 | 3.5/10 |
| Floor-damage reward | 0.0/10 | 0.0/10 |
Benchmark task
A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.
Selfie
Different task instructionsVisual construction and creative interpretation.
MISSINGNO. 49.7/100 Rank 41/53

Muse Spark Open 52.1/100 Rank 40/53

The judgment
MISSINGNO.
An appealing purple character with a readable pleased expression and raised-moustache joke. Smooth shading and clean contours support the simple design, but indistinct mitten grips, minimally textured curls and an uncompressed strap weaken the requested physical interaction. The jelly suggests gloss more convincingly than translucency.
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.
Score breakdown
| Category | MISSINGNO. | Muse Spark Open |
|---|---|---|
| Task & likeness | 5.5/10 | 5.0/10 |
| Anatomy & construction | 4.5/10 | 4.5/10 |
| Space & placement | 6.0/10 | 6.0/10 |
| Light & reflections | 5.5/10 | 5.0/10 |
| Purposeful detail | 4.5/10 | 6.0/10 |
| Artistry & character | 4.5/10 | 5.0/10 |
| Materials & effects | 4.0/10 | 5.0/10 |
| Visual integrity | 6.0/10 | 6.5/10 |
Benchmark task
MISSINGNO.
A glossy purple jelly struggles with an oversized fake moustache at a playful checkpoint. The scene tests comic expression, physical contact and the appearance of a soft translucent body.
Muse Spark Open
A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.
Mona Lisa
Same task instructionsPrecise visual recall and portrait reconstruction.
MISSINGNO. 28.1/100 Rank 36/53

Muse Spark Open 37.8/100 Rank 27/53

The judgment
MISSINGNO.
Clean contours, connected body forms and gentle gradients support a basic, coherent portrait. Likeness remains weak: the face dominates the body, the seated angle is lost, and crossed hands become dark lobes without traceable wrists or fingers. Readable facial details add some drawing complexity, but clothing, landscape and material treatment remain sparse.
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.
Score breakdown
| Category | MISSINGNO. | Muse Spark Open |
|---|---|---|
| Task & likeness | 1.5/10 | 3.0/10 |
| Anatomy & construction | 2.5/10 | 3.0/10 |
| Space & placement | 2.5/10 | 5.0/10 |
| Light & reflections | 3.0/10 | 4.5/10 |
| Purposeful detail | 2.0/10 | 4.0/10 |
| Artistry & character | 3.5/10 | 3.0/10 |
| Materials & effects | 2.0/10 | 4.0/10 |
| Visual integrity | 6.0/10 | 6.0/10 |
Benchmark task
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Beach
Same task instructionsCreativity, perspective and visual beauty.
MISSINGNO. 43.9/100 Rank 46/53

Muse Spark Open 64.2/100 Rank 25/53

The judgment
MISSINGNO.
A coherent sunset beach with clear requested subjects, balanced framing and clean shapes. The aligned solar reflection and warm gradients establish atmosphere. Primitive animal construction, ambiguous furniture, sparse depth cues and minimally developed surfaces limit its drawing complexity and physical richness.
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.
Score breakdown
| Category | MISSINGNO. | Muse Spark Open |
|---|---|---|
| Task & likeness | 7.0/10 | 8.0/10 |
| Anatomy & construction | 4.0/10 | 6.0/10 |
| Space & placement | 6.5/10 | 6.5/10 |
| Light & reflections | 5.0/10 | 5.5/10 |
| Purposeful detail | 3.0/10 | 6.5/10 |
| Artistry & character | 3.0/10 | 5.5/10 |
| Materials & effects | 5.0/10 | 6.0/10 |
| Visual integrity | 3.5/10 | 8.0/10 |
Benchmark task
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Ground Truth
Same task instructionsPhysical reasoning, light and visual reconstruction.
MISSINGNO. 42.8/100 Rank 21/53

Muse Spark Open 51.9/100 Rank 12/53

The judgment
MISSINGNO.
This benchmark has not been assessed yet.
Muse Spark Open
This benchmark has not been assessed yet.
Benchmark task
A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.
Raccoon
Same task instructionsScene composition and interacting subjects.
MISSINGNO. 56.3/100 Rank 29/53

Muse Spark Open 43.9/100 Rank 40/53

The judgment
MISSINGNO.
The requested interaction reads clearly through recognizable animals, expressive faces and a coherent hull-water relationship. Clean curves and readable accessories give the cartoon polish. Partly unresolved grips and supporting contacts limit physical construction; modest shape complexity, weak directional lighting and schematic water constrain its finish.
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.
Score breakdown
| Category | MISSINGNO. | Muse Spark Open |
|---|---|---|
| Task & likeness | 8.0/10 | 4.0/10 |
| Anatomy & construction | 4.5/10 | 3.0/10 |
| Space & placement | 5.5/10 | 6.0/10 |
| Light & reflections | 5.0/10 | 4.5/10 |
| Purposeful detail | 6.0/10 | 7.0/10 |
| Artistry & character | 5.0/10 | 3.5/10 |
| Materials & effects | 4.5/10 | 5.0/10 |
| Visual integrity | 7.0/10 | 5.0/10 |
Benchmark task
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.
Pelican
Same task instructionsSubject construction and spatial relationships.
MISSINGNO. 58.8/100 Rank 39/53

Muse Spark Open 60.5/100 Rank 34/53

The judgment
MISSINGNO.
A coherent, cheerful illustration with recognizable pelican features, balanced composition, clean contours and useful small details. Its controlled curves and layered wheels demonstrate competent drawing skill. Ambiguous pedal and steering contacts, sparse drivetrain construction and weak directional lighting limit the riding mechanics and finish.
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.
Score breakdown
| Category | MISSINGNO. | Muse Spark Open |
|---|---|---|
| Task & likeness | 7.0/10 | 7.5/10 |
| Anatomy & construction | 5.5/10 | 5.0/10 |
| Space & placement | 6.0/10 | 6.0/10 |
| Light & reflections | 5.0/10 | 5.0/10 |
| Purposeful detail | 5.5/10 | 6.5/10 |
| Artistry & character | 6.0/10 | 5.5/10 |
| Materials & effects | 4.5/10 | 6.0/10 |
| Visual integrity | 6.5/10 | 7.5/10 |
Benchmark task
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.