STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra Low vs LongCat-2.0

GPT-6.1 Terra Low leads LongCat-2.0 by 15.8 points on StealthMark, 41.3 to 25.5. It leads on 5 of the 7 benchmarks with results for both and LongCat-2.0 on 2. GPT-6.1 Terra Low scores higher on Ground Truth.

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All results ↗
Model guide ↗

Overall StealthMark

41.3/100Overall rank 35/55
25.5/100Overall rank 47/55

General Intelligence

34.3/100
17.2/100

Visual Intelligence

53.1/100
34.4/100

Open or local

Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6.1 Terra Low
  • LongCat-2.0
  • Other models
  • Median

DATASHEET

Specs and pricing

  • GPT-6.1 Terra Low
  • LongCat-2.0
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6.1 Terra Low: No list priceLongCat-2.0: $1.20$0.30 input
Context windowTokens per request, max output below
GPT-6.1 Terra Low: Not publishedLongCat-2.0: 1M
Output speedTokens per second, our measurement
GPT-6.1 Terra Low: Not measuredLongCat-2.0: 86tokens/s
Developer
Not publishedMeituan
Origin
Not publishedChina
Input → output
Not publishedText → text
Architecture
Not publishedMixture-of-Experts with LongCat Sparse Attention

Full datasheets, every price and sourceLongCat-2.0 ↗

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

Points per level

LevelGPT-6.1 Terra LowLongCat-2.0
Level 1Second Thoughts
4 ptsOut of lives
No run
Level 2Pressure Pot
8 ptsOut of lives
No run
Level 3Hide or Flight
9 ptsSurvived
No run

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

Points per level

LevelGPT-6.1 Terra LowLongCat-2.0
Level 1Hold the door
5.2 ptsCleared
No run
Level 2Crossfeed
9.2 ptsCleared
No run
Level 3Relay vault
18.8 ptsCleared
No run
Level 4Passing bay
10.2 ptsFinished early
No run
Level 5Second thoughts
20.6 ptsCleared
No run

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.

LongCat-2.0

Cyan lies on the sphere's facing middle rather than showing its recent interaction near the apex. Separate airborne black and elongated crimson support part of the timing sequence. Small side images and an overlapping lower image provide limited reflection ordering, but recursive room structure, nested imagery and emitter mappings are largely absent. The main sphere is smaller and higher in the frame than prescribed, and the surfaces have a soft, matte appearance.

Score breakdown

CategoryGPT-6.1 Terra LowLongCat-2.0
State at 600 ms22.0/259.5/25
Camera and placement4.0/156.5/15
Reflections10.0/12012.5/120
Materials and scale6.0/105.5/10
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.

LongCat-2.0

Amber slit eyes, a pointed beak, cream feathers and gold-trimmed black clothing establish the secretive owl rogue. The head appears frontal rather than lowered, with much of the face exposed. The centered silhouette is effective, but stiff cloak geometry, shallow facial modeling and extremely dark clothing limit depth and finish. Sparse gold markings suggest the requested circuitry only loosely.

Score breakdown

CategoryGPT-6.1 Terra LowLongCat-2.0
Task & likeness4.0/107.0/10
Anatomy & construction3.5/106.0/10
Space & placement4.5/106.0/10
Light & reflections5.5/105.5/10
Purposeful detail5.5/106.0/10
Artistry & character5.0/106.5/10
Materials & effects5.5/105.5/10
Visual integrity4.0/106.5/10

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.

LongCat-2.0

A cloaked owl with luminous eyes tests expression, fabric folds and the separation of dark forms.

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.

LongCat-2.0

The centered portrait, slight smile, overlapping hands and distant landscape suggest Mona Lisa, but replication is weak. The face has little volume, the shoulders and torso form a narrow wedge, and the hands are fingerless ovals with unresolved wrists. Broad gray background bands provide limited depth. A bright head rim and pale hands contrast with an almost featureless dark figure.

Score breakdown

CategoryGPT-6.1 Terra LowLongCat-2.0
Task & likeness5.0/100.5/10
Anatomy & construction4.5/100.5/10
Space & placement5.0/100.5/10
Light & reflections6.0/100.5/10
Purposeful detail5.0/100.0/10
Artistry & character5.5/100.5/10
Materials & effects5.0/100.0/10
Visual integrity6.0/100.5/10

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

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.

LongCat-2.0

The sunset, palms, birds and beach animals create a cheerful, readable scene. Clean silhouettes and a vivid sky establish the composition, but construction remains schematic. The right palm appears rooted in open water, shadows have limited connection to the sunset, and the sun’s reflection consists of rigid bands. Small creatures and beach equipment are recognizable but minimally developed.

Score breakdown

CategoryGPT-6.1 Terra LowLongCat-2.0
Task & likeness8.0/107.5/10
Anatomy & construction5.5/105.5/10
Space & placement5.5/105.5/10
Light & reflections6.5/106.0/10
Purposeful detail6.0/105.0/10
Artistry & character5.0/105.0/10
Materials & effects5.5/103.0/10
Visual integrity7.5/104.0/10

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.

LongCat-2.0

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

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.

LongCat-2.0

The raccoon is recognizable and expressive, with a clear mask and striped tail. The dog's anatomy is poorly resolved, and the flattened craft lacks convincing steering and seating. Feet extend below the hull, weakening the sense of support. An appealing palette, clean shapes and decorative water effects give the illustration some polish.

Score breakdown

CategoryGPT-6.1 Terra LowLongCat-2.0
Task & likeness6.5/104.0/10
Anatomy & construction5.0/103.0/10
Space & placement5.5/104.5/10
Light & reflections4.5/105.5/10
Purposeful detail6.0/106.0/10
Artistry & character5.0/103.0/10
Materials & effects5.0/105.5/10
Visual integrity6.0/105.0/10

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

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.

LongCat-2.0

A clearly recognizable pelican cycles through a well-composed coastal sunset. Warm colors, flowing scarf, feather contours and bicycle details give the illustration character. The legs connect to the body, but the farther foot's pedal contact and the wing's handlebar grip remain ambiguous. Clean vector shapes provide polish, with limited material texture and directional shading.

Score breakdown

CategoryGPT-6.1 Terra LowLongCat-2.0
Task & likeness7.0/108.5/10
Anatomy & construction5.5/107.0/10
Space & placement6.0/108.0/10
Light & reflections5.5/107.5/10
Purposeful detail6.5/108.0/10
Artistry & character6.0/108.5/10
Materials & effects6.0/107.0/10
Visual integrity6.0/108.5/10

Benchmark task

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