STEALTHMARK · HEAD TO HEAD

All comparisons ↗

MiMo-V2.6-Pro vs Muse Spark 1.3

MiMo-V2.6-Pro leads Muse Spark 1.3 by 8.1 points on StealthMark, 47.9 to 39.8. It leads on 5 of 9 benchmarks, including Latch, and Muse Spark 1.3 on 4, including Foresight. MiMo-V2.6-Pro scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

47.9/100Overall rank 21/53
39.8/100Overall rank 34/53

General Intelligence

44.3/100
38.3/100

Visual Intelligence

54.3/100
42.3/100

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

Open or local

Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • MiMo-V2.6-Pro
  • Muse Spark 1.3
  • Other models
  • Median

DATASHEET

Specs and pricing

MiMo-V2.6-Pro scores higher on StealthMark and is 4.9× cheaper per output token. Muse Spark 1.3 runs 2.8× faster in our speed test. Both take about 1M tokens of context.

  • MiMo-V2.6-Pro
  • Muse Spark 1.3
  • Other models
  • Median
PricePer 1M output tokens, input below
MiMo-V2.6-Pro: $0.874.9× cheaper$0.43 inputMuse Spark 1.3: $4.25$1.25 input
Context windowTokens per request, max output below
MiMo-V2.6-Pro: 1MTied128K max outputMuse Spark 1.3: 1MTied
Output speedTokens per second, our measurement
MiMo-V2.6-Pro: 116tokens/sMuse Spark 1.3: 3212.8× fastertokens/s
SizeTotal and active parameters
MiMo-V2.6-Pro: 1.02T42B activeMuse Spark 1.3: Not disclosed
Developer
XiaomiMeta
Released
21 Sep 20262 Sep 2026
Origin
ChinaUnited States
Input → output
Text, image, video, audio → textText, image, video, audio, PDF → text
Architecture
Sparse Mixture-of-Experts; OpenRouter maps the route to the released Pro-RL checkpoint. The UltraSpeed edition is a separate routeNot published

Full datasheets, every price and sourceMiMo-V2.6-Pro ↗Muse Spark 1.3 ↗

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.

MiMo-V2.6-Pro 54.6/100Rank 13/47

Survived 1 of 3
Foresight: complete playing field
Level 319 ptsTurn 20 / 20

Muse Spark 1.3 64.3/100Rank 6/47

Survived 2 of 3
Foresight: complete playing field
Level 311 ptsTurn 17 / 20

Points per level

LevelMiMo-V2.6-ProMuse Spark 1.3
Level 1Second Thoughts
4 ptsOut of lives
26 ptsSurvived
Level 2Pressure Pot
9 ptsOut of lives
10 ptsSurvived
Level 3Hide or Flight
19 ptsSurvived
11 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.

MiMo-V2.6-Pro 52.6/100Rank 22/48

Cleared 5 of 5
Latch: complete playing field
Level 520.4 ptsTurn 28 / 40

Muse Spark 1.3 72.4/100Rank 26/483 of 5 levels

3 of 5 played
Latch: complete playing field
Level 318.8 ptsTurn 32 / 36

Points per level

LevelMiMo-V2.6-ProMuse Spark 1.3
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9 ptsClearedFinished early · 1 beacon left
9.8 ptsCleared
Level 3Relay vault
17.2 ptsClearedFinished early · 1 beacon left
18.8 ptsCleared
Level 4Passing bay
16 ptsClearedFinished early · 3 beacons left
Pending
Level 5Second thoughts
20.4 ptsCleared
Not played

Newton's Mirror

Same task instructions

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

The judgment

MiMo-V2.6-Pro

The main framing and visible paint-contact story are well supported. Major optical omissions dominate the result: sparse repetitions, undersized first images, missing outer chains and absent curved nested imagery prevent a coherent mirror-room system. The metallic forms remain convincing in volume but have a soft illustrative finish.

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.

Score breakdown

CategoryMiMo-V2.6-ProMuse Spark 1.3
State at 600 ms23.0/256.0/25
Camera and placement12.0/158.5/15
Reflections19.0/1205.5/120
Materials and scale7.5/104.0/10
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

MiMo-V2.6-Pro

An appealing rabbit with balanced framing, expressive eyes and purposeful costume accents. Simple frontal construction limits anatomical and spatial accomplishment. The orange orb provides an effective luminous focal point, but unreadable wrist connections weaken the requested gestures and prevent stronger integrity credit.

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.

Score breakdown

CategoryMiMo-V2.6-ProMuse Spark 1.3
Task & likeness6.5/108.0/10
Anatomy & construction5.0/105.0/10
Space & placement5.5/106.5/10
Light & reflections6.5/107.0/10
Purposeful detail6.5/106.5/10
Artistry & character5.0/105.5/10
Materials & effects6.5/106.5/10
Visual integrity6.0/107.5/10

Benchmark task

MiMo-V2.6-Pro

A small rabbit in an explorer outfit floats with a luminous orb. The scene tests character anatomy, pose and the placement of geometric forms around it.

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.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

MiMo-V2.6-Pro

The portrait is recognizable through its dark silhouette, slight smile and muted landscape, but replication is weak. A frontal, oversized head and symmetric torso replace the reference's turned seated pose; angular, separated hands omit its central gesture. Smooth shading maintains coherence while anatomical detail, depth and material rendering remain basic.

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.

Score breakdown

CategoryMiMo-V2.6-ProMuse Spark 1.3
Task & likeness3.5/101.0/10
Anatomy & construction3.5/101.5/10
Space & placement4.0/101.5/10
Light & reflections5.0/101.5/10
Purposeful detail3.0/101.0/10
Artistry & character4.0/101.5/10
Materials & effects4.0/101.5/10
Visual integrity6.0/103.0/10

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

MiMo-V2.6-Pro

A readable sunset beach with clear requested subjects, appealing framing and purposeful accessories. Schematic anatomy, flattened foreground objects, repetitive water highlights and sparse directional shadows limit construction and physical depth. The kite's unresolved anchor also constrains integrity.

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.

Score breakdown

CategoryMiMo-V2.6-ProMuse Spark 1.3
Task & likeness8.5/106.5/10
Anatomy & construction5.0/103.0/10
Space & placement6.0/105.5/10
Light & reflections6.5/106.5/10
Purposeful detail6.5/105.0/10
Artistry & character5.0/103.5/10
Materials & effects6.0/103.0/10
Visual integrity6.0/103.5/10

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

MiMo-V2.6-Pro

This benchmark has not been assessed yet.

Muse Spark 1.3

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

MiMo-V2.6-Pro

A coherent, cheerful cartoon with recognizable animals, readable steering contact and useful small details. The dog's orientation follows the craft more successfully than a wholly frontal pose would. Simple anatomy, weak raccoon grip and compressed seating contacts still limit physical credibility. Gradients and spray provide polish without resolving complex construction.

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.

Score breakdown

CategoryMiMo-V2.6-ProMuse Spark 1.3
Task & likeness7.0/108.5/10
Anatomy & construction5.0/106.5/10
Space & placement5.5/107.0/10
Light & reflections5.5/105.0/10
Purposeful detail6.0/106.5/10
Artistry & character4.0/105.5/10
Materials & effects5.5/106.0/10
Visual integrity4.5/107.5/10

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

MiMo-V2.6-Pro

The distinctive bill, continuous silhouette and detailed wheels establish a readable pelican cyclist. Shaped feathers and soft shading add character, but jointless legs, crowded pedal contacts, absent steering contact and loosely directional lighting limit the construction. The comparisons support retaining the baseline category scores.

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.

Score breakdown

CategoryMiMo-V2.6-ProMuse Spark 1.3
Task & likeness6.5/108.5/10
Anatomy & construction5.0/106.0/10
Space & placement6.0/107.0/10
Light & reflections5.5/106.0/10
Purposeful detail6.0/107.0/10
Artistry & character6.0/105.5/10
Materials & effects5.5/106.5/10
Visual integrity6.0/107.0/10

Benchmark task

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