STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Grok 4.7 vs MiMo-V2.6-Pro

MiMo-V2.6-Pro leads Grok 4.7 by 0.7 points on StealthMark, 47.9 to 47.2. It leads on 5 of 9 benchmarks and Grok 4.7 on 4, including both games. MiMo-V2.6-Pro scores higher on Ground Truth.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

47.2/100Overall rank 22/53
47.9/100Overall rank 21/53

General Intelligence

48.4/100
44.3/100

Visual Intelligence

44.8/100
54.3/100

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

  • Grok 4.7

Open or local

Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • Grok 4.7
  • MiMo-V2.6-Pro
  • Other models
  • Median

DATASHEET

Specs and pricing

Grok 4.7 runs 1.6× faster in our speed test. MiMo-V2.6-Pro scores higher on StealthMark, is 6.9× cheaper per output token and takes 2.1× more context.

  • Grok 4.7
  • MiMo-V2.6-Pro
  • Other models
  • Median
PricePer 1M output tokens, input below
Grok 4.7: $6$2 inputMiMo-V2.6-Pro: $0.876.9× cheaper$0.43 input
Context windowTokens per request, max output below
Grok 4.7: 500KMiMo-V2.6-Pro: 1M2.1× larger128K max output
Output speedTokens per second, our measurement
Grok 4.7: 1851.6× fastertokens/sMiMo-V2.6-Pro: 116tokens/s
SizeTotal and active parameters
Grok 4.7: Not disclosedMiMo-V2.6-Pro: 1.02T42B active
Developer
SpaceXAIXiaomi
Released
21 Sep 2026Both
Origin
United StatesChina
Input → output
Text, image → textText, image, video, audio → text
Architecture
Not publishedSparse Mixture-of-Experts; OpenRouter maps the route to the released Pro-RL checkpoint. The UltraSpeed edition is a separate route

Full datasheets, every price and sourceGrok 4.7 ↗MiMo-V2.6-Pro ↗

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.

Grok 4.7 72.6/100Rank 3/47

Survived 3 of 3
Foresight: complete playing field
Level 316 ptsTurn 20 / 20

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

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

Points per level

LevelGrok 4.7MiMo-V2.6-Pro
Level 1Second Thoughts
25 ptsSurvived
4 ptsOut of lives
Level 2Pressure Pot
13 ptsSurvived
9 ptsOut of lives
Level 3Hide or Flight
16 ptsSurvived
19 ptsSurvived

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.

Grok 4.7 65.4/100Rank 18/48

Cleared 4 of 5
Latch: complete playing field
Level 520.4 ptsTurn 28 / 40

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

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

Points per level

LevelGrok 4.7MiMo-V2.6-Pro
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
11.6 ptsFinished early
17.2 ptsClearedFinished early · 1 beacon left
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
16 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20.4 ptsCleared
20.4 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Grok 4.7

Some sphere reflections are correctly placed, with useful size progression and a floor image. Their overlapping side continuations and inverted floor paint order provide additional local optical cues. The gross paint sequence is recognizable, although crimson is a little too low. Incorrect lamp projections and absent nested and receding imagery still leave the mirror system largely incomplete.

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.

Score breakdown

CategoryGrok 4.7MiMo-V2.6-Pro
State at 600 ms23.0/2523.0/25
Camera and placement12.5/1512.0/15
Reflections26.0/12019.0/120
Materials and scale6.5/107.5/10
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

Grok 4.7

The bold spiral dominates an appealing, restrained silhouette, with crisp angular turns and subtle charcoal highlights. However, a visible background gap separates the shell from the body, making the shell appear suspended. The connected head and delicate eye stalks read clearly, while shading and small features remain simple.

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.

Score breakdown

CategoryGrok 4.7MiMo-V2.6-Pro
Task & likeness7.0/106.5/10
Anatomy & construction5.0/105.0/10
Space & placement5.5/105.5/10
Light & reflections4.0/106.5/10
Purposeful detail2.5/106.5/10
Artistry & character3.5/105.0/10
Materials & effects2.5/106.5/10
Visual integrity7.5/106.0/10

Benchmark task

Grok 4.7

A dark snail with a geometric spiral shell tests silhouette, curved construction and restrained material shading.

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.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Grok 4.7

Dark clothing, overlapping hands and a restrained smile make the reference recognizable. The broad frontal face, elongated neck and oversized head weaken likeness and anatomical proportion; rounded hands lack convincing fingers. Gentle facial shading suggests volume, while clothing and landscape remain flat. Angular veil overlaps and a hard horizontal background boundary weaken the finish.

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.

Score breakdown

CategoryGrok 4.7MiMo-V2.6-Pro
Task & likeness2.0/103.5/10
Anatomy & construction2.0/103.5/10
Space & placement3.0/104.0/10
Light & reflections1.5/105.0/10
Purposeful detail3.0/103.0/10
Artistry & character2.5/104.0/10
Materials & effects2.0/104.0/10
Visual integrity3.0/106.0/10

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

Grok 4.7

The warm sunset, blue water and scattered beach activities create a cheerful, readable composition. Animals and equipment use basic silhouettes, with limited anatomical detail and grounding. The sun reflection forms a rigid tapered strip, and foreground objects lack cast shadows. Clean shapes support the illustration, but depth, materials and drawing complexity remain modest.

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.

Score breakdown

CategoryGrok 4.7MiMo-V2.6-Pro
Task & likeness7.5/108.5/10
Anatomy & construction4.5/105.0/10
Space & placement5.5/106.0/10
Light & reflections6.0/106.5/10
Purposeful detail5.0/106.5/10
Artistry & character3.5/105.0/10
Materials & effects4.5/106.0/10
Visual integrity6.0/106.0/10

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

Grok 4.7

This benchmark has not been assessed yet.

MiMo-V2.6-Pro

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

Grok 4.7

The raccoon rides clearly on the dog's back, and expressive faces, bright colors and a readable orange hull create a playful composition. Steering is unresolved: the dog's visible paws rest on the deck rather than grasping the controls. Simple body shapes and ribbonlike wake limit construction and movement. The glowing sun produces little corresponding illumination or reflection.

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.

Score breakdown

CategoryGrok 4.7MiMo-V2.6-Pro
Task & likeness7.0/107.0/10
Anatomy & construction4.5/105.0/10
Space & placement6.5/105.5/10
Light & reflections4.5/105.5/10
Purposeful detail5.5/106.0/10
Artistry & character5.5/104.0/10
Materials & effects5.5/105.5/10
Visual integrity3.5/104.5/10

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

Grok 4.7

The pelican reads clearly through its long bill, throat pouch and curved neck. Clean pastel shapes and balanced scenery make an appealing illustration. The riding mechanism is less convincing: feet lack clear pedal contact, steering is unresolved, and the frame lacks a coherent drivetrain. Simple shading and sparse feather detail limit depth and finish.

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.

Score breakdown

CategoryGrok 4.7MiMo-V2.6-Pro
Task & likeness7.5/106.5/10
Anatomy & construction4.5/105.0/10
Space & placement6.5/106.0/10
Light & reflections6.0/105.5/10
Purposeful detail6.0/106.0/10
Artistry & character5.5/106.0/10
Materials & effects5.5/105.5/10
Visual integrity6.0/106.0/10

Benchmark task

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