STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra Low vs MiMo-V2.6-Flash

MiMo-V2.6-Flash leads GPT-6.1 Terra Low by 3.3 points on StealthMark, 44.6 to 41.3. GPT-6.1 Terra Low leads on 5 of 9 benchmarks, including both games, and MiMo-V2.6-Flash on 4. GPT-6.1 Terra Low 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

41.3/100Overall rank 35/55
44.6/100Overall rank 29/55

General Intelligence

34.3/100
41.0/100

Visual Intelligence

53.1/100
49.8/100

Open or local

Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6.1 Terra Low
  • MiMo-V2.6-Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

  • GPT-6.1 Terra Low
  • MiMo-V2.6-Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6.1 Terra Low: No list priceMiMo-V2.6-Flash: $0.28$0.14 input
Context windowTokens per request, max output below
GPT-6.1 Terra Low: Not publishedMiMo-V2.6-Flash: 1M128K max output
Output speedTokens per second, our measurement
GPT-6.1 Terra Low: Not measuredMiMo-V2.6-Flash: 547tokens/s
SizeTotal and active parameters
GPT-6.1 Terra Low: Not disclosedMiMo-V2.6-Flash: 309B15B active
Developer
Not publishedXiaomi
Released
Not published21 Sep 2026
Origin
Not publishedChina
Input → output
Not publishedText, image, video, audio → text
Architecture
Not publishedReleased Flash-RL checkpoint: sparse Mixture-of-Experts; hosted Flash and MOPD variants are distinct artifacts

Full datasheets, every price and sourceMiMo-V2.6-Flash ↗

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.

GPT-6.1 Terra Low 36.1/100Rank 26/51

Survived 1 of 3
Foresight: complete playing field
Level 39 ptsTurn 20 / 20

MiMo-V2.6-Flash 71.3/100Rank 39/511 of 3 levels

1 of 3 played
Foresight: complete playing field
Level 212 ptsTurn 14 / 18

Points per level

LevelGPT-6.1 Terra LowMiMo-V2.6-Flash
Level 1Second Thoughts
4 ptsOut of lives
Pending
Level 2Pressure Pot
8 ptsOut of lives
12 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
Not played

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.

GPT-6.1 Terra Low 62.4/100Rank 23/52

Cleared 4 of 5
Latch: complete playing field
Level 520.6 ptsTurn 27 / 40

MiMo-V2.6-Flash 66.3/100Rank 31/523 of 5 levels

3 of 5 played
Latch: complete playing field
Level 318 ptsTurn 36 / 36

Points per level

LevelGPT-6.1 Terra LowMiMo-V2.6-Flash
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.2 ptsCleared
9.6 ptsCleared
Level 3Relay vault
18.8 ptsCleared
18 ptsCleared
Level 4Passing bay
10.2 ptsFinished early
Pending
Level 5Second thoughts
20.6 ptsCleared
Not played

Newton's Mirror

Same task instructions

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

The judgment

GPT-6.1 Terra Low

Deformed colored paint and a separate airborne black body establish readable interaction history. Cyan has travelled too far, framing differs substantially, and the mirror system supplies only elementary bands and oval copies. Missing recursive geometry, nested spherical imagery and emitter mapping remain the dominant weaknesses.

MiMo-V2.6-Flash

The faint lower sphere image provides limited reflection evidence through reversed paint-color ordering. The wider reflection system and nested room imagery are absent. The colored beads do not resolve the required impact and transport history, while displaced paint positions and weak material rendering further limit the result.

Score breakdown

CategoryGPT-6.1 Terra LowMiMo-V2.6-Flash
State at 600 ms22.0/255.0/25
Camera and placement4.0/154.5/15
Reflections10.0/1206.5/120
Materials and scale6.0/102.5/10
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

GPT-6.1 Terra Low

Six attached outward-facing heads, delicate scales and soft ivory shading establish an orderly decorative motif. Separate paddle-shaped bodies replace the required interlocking loops and leave no enclosed central hexagon. Surface detail provides interest, but repeated simple forms, schematic faces and limited anatomical modeling constrain the result.

MiMo-V2.6-Flash

The centered rabbit has an appealing alert expression, a balanced silhouette, and a restrained technological palette. Outfit panels and orbital accents are cleanly resolved. The orb-holding paw has an ambiguous grip, the ears lack distinct angular bends, and the halo's interlocking construction is unclear. Soft shading suggests volume, but materials and spatial depth remain simplified.

Score breakdown

CategoryGPT-6.1 Terra LowMiMo-V2.6-Flash
Task & likeness4.0/108.0/10
Anatomy & construction3.5/106.5/10
Space & placement4.5/107.0/10
Light & reflections5.5/107.0/10
Purposeful detail5.5/106.0/10
Artistry & character5.0/105.5/10
Materials & effects5.5/106.5/10
Visual integrity4.0/108.0/10

Benchmark task

GPT-6.1 Terra Low

A pale serpent woven into an interlocking knot tests connected anatomy, repeated structure and readable overlaps. Organic surface detail must work with the overall geometry.

MiMo-V2.6-Flash

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

GPT-6.1 Terra Low

A recognizable, coherent portrait with purposeful facial detail, warm local volume and layered scenery. The frontal pose, enlarged face, merged hands and shallow clothing construction substantially limit replication and drawing skill. The visible successes support retaining the current assessment.

MiMo-V2.6-Flash

The dark clothing, long hair, folded hands and hazy landscape make the reference recognizable. Replication is limited by the frontal symmetry, elongated face, wide staring eyes and downturned mouth. Both arms connect to the hands, but the overlapping palms and looplike fingers are poorly resolved. Soft facial shading provides some volume; the clothing and landscape remain broad, simplified shapes.

Score breakdown

CategoryGPT-6.1 Terra LowMiMo-V2.6-Flash
Task & likeness5.0/103.0/10
Anatomy & construction4.5/102.5/10
Space & placement5.0/104.0/10
Light & reflections6.0/103.0/10
Purposeful detail5.0/104.0/10
Artistry & character5.5/102.5/10
Materials & effects5.0/103.5/10
Visual integrity6.0/105.5/10

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

GPT-6.1 Terra Low

A coherent sunset scene demonstrates the beach, animals, birds and reflections. Flowing silhouettes, warm color transitions and intact attachments are its strongest properties. Simplified anatomy, the turtle's elevated viewing angle and symbolic surface effects constrain drawing complexity and physical depth.

MiMo-V2.6-Flash

The warm sunset, aligned reflection, framing palms and playful beach animals create an appealing, coherent scene. Small toys and shells remain readable. Drawing is simplified: animals have limited volume, water uses repetitive horizontal strokes, and foreground shadows do not consistently follow the central sun. Clean execution supports a competent illustration, but depth and material rendering remain modest.

Score breakdown

CategoryGPT-6.1 Terra LowMiMo-V2.6-Flash
Task & likeness8.0/107.5/10
Anatomy & construction5.5/106.5/10
Space & placement5.5/107.0/10
Light & reflections6.5/106.0/10
Purposeful detail6.0/107.0/10
Artistry & character5.0/106.0/10
Materials & effects5.5/106.0/10
Visual integrity7.5/108.0/10

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

GPT-6.1 Terra Low

This benchmark has not been assessed yet.

MiMo-V2.6-Flash

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

GPT-6.1 Terra Low

Recognizable animals, a coherent craft and sweeping wake make an appealing cartoon. Basic limb construction, weakly demonstrated raccoon seating and limited shared perspective constrain the scene. Small identifying details work well, while lighting and materials remain broadly graphic.

MiMo-V2.6-Flash

The raccoon riding the dog reads clearly, with expressive faces and a cheerful waterscape. The steering action is weak: no paw reaches the handlebar, which meets the dog's muzzle. The vehicle resembles a thin board with a steering post. Overlapping limbs obscure anatomy, while limited shadows, reflections and surface modeling keep the scene flat.

Score breakdown

CategoryGPT-6.1 Terra LowMiMo-V2.6-Flash
Task & likeness6.5/106.5/10
Anatomy & construction5.0/104.0/10
Space & placement5.5/106.5/10
Light & reflections4.5/104.5/10
Purposeful detail6.0/105.5/10
Artistry & character5.0/104.0/10
Materials & effects5.0/105.5/10
Visual integrity6.0/106.0/10

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

GPT-6.1 Terra Low

A coherent coastal illustration with a distinctive pelican, controlled contours and clearly organised bicycle wheels. Visible saddle support and shaped neck and wing contours earn credit beyond basic geometric construction. Rubbery legs, unresolved pedal contacts and absent steering contact limit the riding action. Lighting and materials remain restrained and spatially shallow.

MiMo-V2.6-Flash

The pelican is immediately recognizable, with an expressive eye and prominent pouch, and the landscape provides clear framing. Clean outlines and spokes support the cheerful illustration. Both feet visibly miss the bicycle's pedal mechanism, weakening the riding action. Simplified machinery, shallow depth and loosely directional shading limit the requested masterpiece quality.

Score breakdown

CategoryGPT-6.1 Terra LowMiMo-V2.6-Flash
Task & likeness7.0/108.0/10
Anatomy & construction5.5/105.5/10
Space & placement6.0/107.0/10
Light & reflections5.5/106.0/10
Purposeful detail6.5/107.0/10
Artistry & character6.0/106.5/10
Materials & effects6.0/105.5/10
Visual integrity6.0/107.5/10

Benchmark task

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