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 ↘
Model guide ↗
All results ↗

Overall StealthMark

38.7/100Overall rank 36/53
44.1/100Overall rank 29/53

General Intelligence

35.3/100
42.6/100

Visual Intelligence

42.4/100
46.6/100

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

Open or local

BENCHMARK BY BENCHMARK

Where each model leads

  • MISSINGNO.
  • Muse Spark Open
  • Other models
  • Median

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
PricePer 1M output tokens, input below
MISSINGNO.: No list priceMuse Spark Open: $4.25$1.25 input
Context windowTokens per request, max output below
MISSINGNO.: Not publishedMuse Spark Open: 1M1M max output
Output speedTokens per second, our measurement
MISSINGNO.: 8462.3× fastertokens/sMuse Spark Open: 361tokens/s
SizeTotal and active parameters
MISSINGNO.: Not disclosedMuse Spark Open: 816B42B active
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 ↗

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.

Muse Spark Open 29.4/100Rank 34/47

Survived 0 of 3
Foresight: complete playing field
Level 38 ptsTurn 15 / 20

Points per level

LevelMISSINGNO.Muse Spark Open
Level 1Second Thoughts
No run
4 ptsOut of lives
Level 2Pressure Pot
No run
9 ptsOut of lives
Level 3Hide or Flight
No run
8 ptsOut of lives

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.

Muse Spark Open 75.7/100Rank 12/48

Cleared 5 of 5
Latch: complete playing field
Level 519.6 ptsTurn 32 / 40

Points per level

LevelMISSINGNO.Muse Spark Open
Level 1Hold the door
No run
5.2 ptsCleared
Level 2Crossfeed
No run
9.8 ptsCleared
Level 3Relay vault
No run
19.2 ptsCleared
Level 4Passing bay
No run
17.8 ptsClearedFinished early · 1 beacon left
Level 5Second thoughts
No run
19.6 ptsCleared

Newton's Mirror

Same task instructions

Physics, perspective and recursive reflections, tested together. Explore the test ↗

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

CategoryMISSINGNO.Muse Spark Open
State at 600 ms19.0/2514.0/25
Camera and placement7.0/156.0/15
Reflections12.0/1208.0/120
Materials and scale5.5/103.5/10
Floor-damage reward0.0/100.0/10

Benchmark task

A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.

Selfie

Different task instructions

Visual construction and creative interpretation.

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

CategoryMISSINGNO.Muse Spark Open
Task & likeness5.5/105.0/10
Anatomy & construction4.5/104.5/10
Space & placement6.0/106.0/10
Light & reflections5.5/105.0/10
Purposeful detail4.5/106.0/10
Artistry & character4.5/105.0/10
Materials & effects4.0/105.0/10
Visual integrity6.0/106.5/10

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 instructions

Precise visual recall and portrait reconstruction.

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

CategoryMISSINGNO.Muse Spark Open
Task & likeness1.5/103.0/10
Anatomy & construction2.5/103.0/10
Space & placement2.5/105.0/10
Light & reflections3.0/104.5/10
Purposeful detail2.0/104.0/10
Artistry & character3.5/103.0/10
Materials & effects2.0/104.0/10
Visual integrity6.0/106.0/10

Benchmark task

An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.

Beach

Same task instructions

Creativity, perspective and visual beauty.

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

CategoryMISSINGNO.Muse Spark Open
Task & likeness7.0/108.0/10
Anatomy & construction4.0/106.0/10
Space & placement6.5/106.5/10
Light & reflections5.0/105.5/10
Purposeful detail3.0/106.5/10
Artistry & character3.0/105.5/10
Materials & effects5.0/106.0/10
Visual integrity3.5/108.0/10

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

Ground Truth

Same task instructions

Physical reasoning, light and visual reconstruction.

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 instructions

Scene composition and interacting subjects.

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

CategoryMISSINGNO.Muse Spark Open
Task & likeness8.0/104.0/10
Anatomy & construction4.5/103.0/10
Space & placement5.5/106.0/10
Light & reflections5.0/104.5/10
Purposeful detail6.0/107.0/10
Artistry & character5.0/103.5/10
Materials & effects4.5/105.0/10
Visual integrity7.0/105.0/10

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 instructions

Subject construction and spatial relationships.

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

CategoryMISSINGNO.Muse Spark Open
Task & likeness7.0/107.5/10
Anatomy & construction5.5/105.0/10
Space & placement6.0/106.0/10
Light & reflections5.0/105.0/10
Purposeful detail5.5/106.5/10
Artistry & character6.0/105.5/10
Materials & effects4.5/106.0/10
Visual integrity6.5/107.5/10

Benchmark task

A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.