STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Gemma 4 26B A4B vs Muse Spark Open

Muse Spark Open leads Gemma 4 26B A4B by 27.6 points on StealthMark, 44.1 to 16.5. It leads on 8 of 9 benchmarks, including both games, and Gemma 4 26B A4B on 1. Muse Spark Open scores higher on Ground Truth.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

16.5/100Overall rank 50/53
44.1/100Overall rank 29/53

General Intelligence

9.4/100
42.6/100

Visual Intelligence

28.9/100
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

  • Gemma 4 26B A4B
  • Muse Spark Open

Open or local

Local modelOpen model · Apache 2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Gemma 4 26B A4B
  • Muse Spark Open
  • Other models
  • Median

DATASHEET

Specs and pricing

Gemma 4 26B A4B is 14× cheaper per output token. Muse Spark Open scores higher on StealthMark, takes 4× more context and runs 3.8× faster in our speed test.

  • Gemma 4 26B A4B
  • Muse Spark Open
  • Other models
  • Median
PricePer 1M output tokens, input below
Gemma 4 26B A4B: $0.3014× cheaper$0.09 inputMuse Spark Open: $4.25$1.25 input
Context windowTokens per request, max output below
Gemma 4 26B A4B: 256KMuse Spark Open: 1M4× larger1M max output
Output speedTokens per second, our measurement
Gemma 4 26B A4B: 95tokens/sMuse Spark Open: 3613.8× fastertokens/s
SizeTotal and active parameters
Gemma 4 26B A4B: 25.2B3.8B activeMuse Spark Open: 816B42B active
Developer
Google DeepMindMeta
Released
2 Apr 202615 Oct 2026
Origin
United StatesBoth
Input → output
Text, image → textText, image, audio, video → text
Architecture
Mixture-of-Experts multimodal transformer with interleaved sliding-window and global attentionSparse 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 sourceGemma 4 26B A4B ↗Muse 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.

Gemma 4 26B A4B 4.1/100Rank 46/47

Survived 0 of 3
Foresight: complete playing field
Level 32 ptsTurn 9 / 20

Muse Spark Open 29.4/100Rank 34/47

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

Points per level

LevelGemma 4 26B A4BMuse Spark Open
Level 1Second Thoughts
3 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
2 ptsOut of lives
9 ptsOut of lives
Level 3Hide or Flight
2 ptsOut of lives
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.

Gemma 4 26B A4B 4.5/100Rank 41/48

Cleared 2 of 5
Latch: complete playing field
Level 53 ptsTurn 40 / 40

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

LevelGemma 4 26B A4BMuse Spark Open
Level 1Hold the door
3 ptsCleared1 beacon left
5.2 ptsCleared
Level 2Crossfeed
6.2 ptsFinished early
9.8 ptsCleared
Level 3Relay vault
15.2 ptsClearedFinished early · 3 beacons left
19.2 ptsCleared
Level 4Passing bay
11.8 ptsFinished early
17.8 ptsClearedFinished early · 1 beacon left
Level 5Second thoughts
3 ptsOut of turns
19.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Gemma 4 26B A4B

Separate airborne black and contact-compatible paint flattening earn partial state credit. Settlement, adhesion and differentiated paint transport remain unresolved. The enlarged, low sphere and thin lamp strip substantially depart from the required camera, while the defining mirror structure is missing. Weak material appearance and oversized black paint limit material credit. The retained base total is 18/170; the floor-damage reward is 0, giving 18/180.

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

CategoryGemma 4 26B A4BMuse Spark Open
State at 600 ms10.0/2514.0/25
Camera and placement2.0/156.0/15
Reflections0.0/1208.0/120
Materials and scale2.5/103.5/10
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

Gemma 4 26B A4B

An appealing, readable sparkle-creature with luminous colour and expressive eyes. Simple geometric construction limits sophistication, while sharp body points, ambiguous hand contact and a minimally resolved jar weaken the requested soft, plump character and treasure-presenting pose.

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

CategoryGemma 4 26B A4BMuse Spark Open
Task & likeness5.5/105.0/10
Anatomy & construction4.5/104.5/10
Space & placement6.0/106.0/10
Light & reflections6.0/105.0/10
Purposeful detail5.5/106.0/10
Artistry & character4.0/105.0/10
Materials & effects6.0/105.0/10
Visual integrity7.0/106.5/10

Benchmark task

Gemma 4 26B A4B

A small luminous creature proudly holding an empty glass jar tests expression, transparent materials and the balance of character and prop.

Muse Spark Open

A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Gemma 4 26B A4B

The centered dark-haired portrait provides a loose reference cue, but its elongated, nearly featureless face and undifferentiated torso fall far short of replication. Crossed hands, the subtle smile, clothing structure and landscape are unresolved. Clean silhouettes and soft gradients provide limited coherence.

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

CategoryGemma 4 26B A4BMuse Spark Open
Task & likeness0.5/103.0/10
Anatomy & construction2.0/103.0/10
Space & placement1.0/105.0/10
Light & reflections2.0/104.5/10
Purposeful detail1.0/104.0/10
Artistry & character2.0/103.0/10
Materials & effects1.0/104.0/10
Visual integrity4.5/106.0/10

Benchmark task

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

Beach

Different task instructions

Creativity, perspective and visual beauty.

The judgment

Gemma 4 26B A4B

A clean, balanced sunset scene demonstrates the beach, birds and a centered reflection. Animals and play receive only minimal treatment. Coherent layers and controlled gradients support readability, but unresolved aquatic anatomy, sparse details and weak surface modeling keep the drawing basic.

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

CategoryGemma 4 26B A4BMuse Spark Open
Task & likeness3.5/108.0/10
Anatomy & construction2.0/106.0/10
Space & placement3.5/106.5/10
Light & reflections5.0/105.5/10
Purposeful detail1.0/106.5/10
Artistry & character1.5/105.5/10
Materials & effects2.0/106.0/10
Visual integrity6.0/108.0/10

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

Gemma 4 26B A4B

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

Different task instructions

Scene composition and interacting subjects.

The judgment

Gemma 4 26B A4B

The animal stack is recognizable, and clean silhouettes support a basic illustration. Steering is not depicted, while the craft's construction and water contact remain unresolved. Sparse anatomical and material detail limit the finish. The sky gradient and glow provide atmospheric lighting, but the subjects lack corresponding modeling.

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

CategoryGemma 4 26B A4BMuse Spark Open
Task & likeness2.5/104.0/10
Anatomy & construction2.5/103.0/10
Space & placement4.0/106.0/10
Light & reflections3.5/104.5/10
Purposeful detail2.5/107.0/10
Artistry & character3.0/103.5/10
Materials & effects2.0/105.0/10
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

Different task instructions

Subject construction and spatial relationships.

The judgment

Gemma 4 26B A4B

A clean, balanced icon suggests a pelican riding a bicycle. Continuous contours and restrained colors support its finish, but the abbreviated bill, undifferentiated body, unresolved riding contacts and incomplete bicycle mechanism limit likeness and construction. Sparse detail and flat lighting keep the drawing basic despite its clarity.

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

CategoryGemma 4 26B A4BMuse Spark Open
Task & likeness3.0/107.5/10
Anatomy & construction3.0/105.0/10
Space & placement5.0/106.0/10
Light & reflections3.0/105.0/10
Purposeful detail3.0/106.5/10
Artistry & character2.5/105.5/10
Materials & effects2.5/106.0/10
Visual integrity5.0/107.5/10

Benchmark task

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