STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Mistral Large 4 vs Muse Spark Open

Muse Spark Open leads Mistral Large 4 by 0.8 points on StealthMark, 44.1 to 43.3. Mistral Large 4 leads on 6 of 9 benchmarks and Muse Spark Open on 3, including both games. Mistral Large 4 scores higher on Raccoon, with its largest category advantage in anatomy & construction.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

43.3/100Overall rank 31/53
44.1/100Overall rank 29/53

General Intelligence

34.4/100
42.6/100

Visual Intelligence

58.0/100
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

  • Muse Spark Open

BENCHMARK BY BENCHMARK

Where each model leads

  • Mistral Large 4
  • Muse Spark Open
  • Other models
  • Median

DATASHEET

Specs and pricing

Muse Spark Open scores higher on StealthMark and runs 2.4× faster in our speed test. Both take about 1M tokens of context.

  • Mistral Large 4
  • Muse Spark Open
  • Other models
  • Median
PricePer 1M output tokens, input below
Mistral Large 4: $4.18Tied$1.36 inputMuse Spark Open: $4.25Tied$1.25 input
Context windowTokens per request, max output below
Mistral Large 4: 1MTied256K max outputMuse Spark Open: 1MTied1M max output
Output speedTokens per second, our measurement
Mistral Large 4: 151tokens/sMuse Spark Open: 3612.4× fastertokens/s
SizeTotal and active parameters
Mistral Large 4: 1.05T49B activeMuse Spark Open: 816B42B active
Developer
Mistral AIMeta
Released
6 Oct 202615 Oct 2026
Origin
FranceUnited States
Input → output
Text, image → textText, image, audio, video → text
Architecture
Granular mixture of experts (MoE); multimodal text and image input, text output.Sparse 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 sourceMistral Large 4 ↗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.

Mistral Large 4 22.0/100Rank 39/47

Survived 0 of 3
Foresight: complete playing field
Level 34 ptsTurn 8 / 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

LevelMistral Large 4Muse Spark Open
Level 1Second Thoughts
1 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
9 ptsOut of lives
Level 3Hide or Flight
4 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.

Mistral Large 4 49.4/100Rank 23/48

Cleared 5 of 5
Latch: complete playing field
Level 519.8 ptsTurn 31 / 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

LevelMistral Large 4Muse Spark Open
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
9.8 ptsCleared
Level 3Relay vault
15.8 ptsClearedFinished early · 3 beacons left
19.2 ptsCleared
Level 4Passing bay
16.2 ptsClearedFinished early · 3 beacons left
17.8 ptsClearedFinished early · 1 beacon left
Level 5Second thoughts
19.8 ptsCleared
19.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Mistral Large 4

The central sphere, airborne black and deformed crimson support substantial state and placement credit. Recent cyan contact and crimson transport remain uncertain. Sparse wall patches and glossy gradients provide little evidence of the required extensive mirror system, while the missing centerline lamp and bulky crimson remain visible weaknesses.

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

CategoryMistral Large 4Muse Spark Open
State at 600 ms17.0/2514.0/25
Camera and placement11.0/156.0/15
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

Mistral Large 4

An appealing, coherent illustration whose enormous rounded cat anchors the windblown composition. Warm shading and floating sketches communicate the brief well. Simplified paws, faint ear construction, inconsistent wind cues and limited material texture keep the execution below exceptional.

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

CategoryMistral Large 4Muse Spark Open
Task & likeness8.0/105.0/10
Anatomy & construction7.0/104.5/10
Space & placement7.5/106.0/10
Light & reflections7.0/105.0/10
Purposeful detail7.0/106.0/10
Artistry & character7.0/105.0/10
Materials & effects7.0/105.0/10
Visual integrity8.0/106.5/10

Benchmark task

Mistral Large 4

A heavy ginger cat stays planted on a terrace as wind carries papers around it. The scene tests weight, expression and the contrast between stable and moving forms.

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

Mistral Large 4

A recognizable, cleanly rendered interpretation with a restrained palette and some facial modeling. Its enlarged frontal head, simplified expression, compressed low hands and schematic landscape substantially limit likeness and construction. The smooth rendering does not reproduce the painting's nuanced anatomy, clothing or atmospheric depth.

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

CategoryMistral Large 4Muse Spark Open
Task & likeness4.0/103.0/10
Anatomy & construction3.5/103.0/10
Space & placement5.0/105.0/10
Light & reflections4.5/104.5/10
Purposeful detail4.0/104.0/10
Artistry & character4.0/103.0/10
Materials & effects4.5/104.0/10
Visual integrity5.5/106.0/10

Benchmark task

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

Beach

Same task instructions

Creativity, perspective and visual beauty.

The judgment

Mistral Large 4

A clean, appealing beach illustration with clear subject coverage, a cohesive sunset palette and expressive animal details. Bodies and accessories resolve basic construction coherently, although joints remain schematic. Layered shapes establish modest depth; generic oval shadows and flat surfaces limit physical richness. Repeated forms and sparse articulation leave room for more accomplished drawing.

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

CategoryMistral Large 4Muse Spark Open
Task & likeness7.5/108.0/10
Anatomy & construction6.0/106.0/10
Space & placement7.0/106.5/10
Light & reflections6.5/105.5/10
Purposeful detail6.0/106.5/10
Artistry & character6.0/105.5/10
Materials & effects6.5/106.0/10
Visual integrity8.0/108.0/10

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

Mistral Large 4

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

Mistral Large 4

The central interaction is clear, with recognizable animals, expressive faces and a coherent sunset composition. Clean contours and readable accessories give the cartoon polish. Simplified joints, uncertain steering attachment, shallow hull volume and limited directional lighting constrain its physical resolution.

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

CategoryMistral Large 4Muse Spark Open
Task & likeness8.5/104.0/10
Anatomy & construction6.5/103.0/10
Space & placement7.0/106.0/10
Light & reflections5.5/104.5/10
Purposeful detail7.5/107.0/10
Artistry & character6.5/103.5/10
Materials & effects6.5/105.0/10
Visual integrity8.0/105.0/10

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

Mistral Large 4

A coherent, appealing pelican illustration with a continuous body silhouette, readable bicycle and grounded wheels. Simplified legs and ambiguous steering and pedal connections limit construction. Clean shapes and expressive accessories succeed, while shallow depth, modest lighting and sparse material differentiation leave substantial room for refinement.

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

CategoryMistral Large 4Muse Spark Open
Task & likeness8.5/107.5/10
Anatomy & construction6.0/105.0/10
Space & placement7.0/106.0/10
Light & reflections6.5/105.0/10
Purposeful detail7.0/106.5/10
Artistry & character7.0/105.5/10
Materials & effects6.5/106.0/10
Visual integrity8.0/107.5/10

Benchmark task

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