STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra vs LongCat-2.0

GPT-6.1 Terra leads LongCat-2.0 by 34.9 points on StealthMark, 60.4 to 25.5. It leads on 6 of the 7 benchmarks with results for both and LongCat-2.0 on 1. GPT-6.1 Terra scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
Model guide ↗

Overall StealthMark

60.4/100Overall rank 9/54
25.5/100Overall rank 46/54

General Intelligence

58.0/100
17.2/100

Visual Intelligence

64.9/100
34.4/100

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

  • LongCat-2.0Multi-step reasoning not measured

Open or local

Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

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

DATASHEET

Specs and pricing

GPT-6.1 Terra scores higher on StealthMark. LongCat-2.0 is 4.2× cheaper per output token. Both take about 1.05M tokens of context.

  • GPT-6.1 Terra
  • LongCat-2.0
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6.1 Terra: $5$1 inputLongCat-2.0: $1.204.2× cheaper$0.30 input
Context windowTokens per request, max output below
GPT-6.1 Terra: 1.05MTied128K max outputLongCat-2.0: 1MTied
Output speedTokens per second, our measurement
GPT-6.1 Terra: Not measuredLongCat-2.0: 86tokens/s
Developer
OpenAIMeituan
Released
26 Oct 2026Not published
Origin
United StatesChina
Input → output
Text, image → textText → text
Architecture
Not publishedMixture-of-Experts with LongCat Sparse Attention

Full datasheets, every price and sourceGPT-6.1 Terra ↗LongCat-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 62.0/100Rank 9/50

Survived 2 of 3
Foresight: complete playing field
Level 315 ptsTurn 20 / 20

Points per level

LevelGPT-6.1 TerraLongCat-2.0
Level 1Second Thoughts
21 ptsSurvived
No run
Level 2Pressure Pot
9 ptsOut of lives
No run
Level 3Hide or Flight
15 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 77.7/100Rank 12/51

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

Points per level

LevelGPT-6.1 TerraLongCat-2.0
Level 1Hold the door
5.2 ptsCleared
No run
Level 2Crossfeed
9.8 ptsCleared
No run
Level 3Relay vault
19.2 ptsCleared
No run
Level 4Passing bay
17.8 ptsClearedFinished early · 3 beacons left
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

The sphere, airborne black and first reflected silhouettes preserve important geometry within the portrait frame. Paint deformation, contact order and forward transport are supported, with a small crimson endpoint overshoot. Major optical omissions dominate: short finite reflection sequences and smooth bands replace extensive, spatially ordered mirror imagery. Dark gloss and crisp upper emitter shapes provide partial material credit.

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 TerraLongCat-2.0
State at 600 ms23.0/259.5/25
Camera and placement11.0/156.5/15
Reflections33.0/12012.5/120
Materials and scale7.5/105.5/10
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

A balanced serpent emblem with six attached outward heads, delicate scales and softly rounded bodies. Its compact silhouette reads clearly, but central routing does not establish every alternating crossing or crisp inward corner. Repetitive texture, limited facial anatomy and weak contact shadows constrain its organic character.

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 TerraLongCat-2.0
Task & likeness7.5/107.0/10
Anatomy & construction6.5/106.0/10
Space & placement6.5/106.0/10
Light & reflections6.0/105.5/10
Purposeful detail6.5/106.0/10
Artistry & character6.5/106.5/10
Materials & effects6.0/105.5/10
Visual integrity6.0/106.5/10

Benchmark task

GPT-6.1 Terra

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

A recognizable interpretation with developed facial shading, shaped sleeve folds and purposeful small features. These strengths support modest upward calibration, while the frontal torso, elongated proportions, schematic finger joints and unresolved seated support keep replication and construction uneven.

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 TerraLongCat-2.0
Task & likeness5.5/100.5/10
Anatomy & construction6.5/100.5/10
Space & placement4.5/100.5/10
Light & reflections6.5/100.5/10
Purposeful detail6.0/100.0/10
Artistry & character6.0/100.5/10
Materials & effects6.0/100.0/10
Visual integrity6.5/100.5/10

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

A coherent sunset illustration with clear prompt fulfillment, controlled framing and varied, purposeful small details. Simplified joints, frontal staging, flattened animal forms and weakly directional shadows limit its anatomical, spatial and physical sophistication.

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 TerraLongCat-2.0
Task & likeness8.5/107.5/10
Anatomy & construction7.5/105.5/10
Space & placement6.5/105.5/10
Light & reflections5.5/106.0/10
Purposeful detail7.5/105.0/10
Artistry & character7.0/105.0/10
Materials & effects6.5/103.0/10
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

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

A coherent cartoon with expressive animals, readable steering and a clear wake. Fine facial and hull details reward inspection. The main limits are the boatlike craft, simplified joints, weakly braced frontal raccoon and minimal directional lighting or material depth.

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 TerraLongCat-2.0
Task & likeness6.5/104.0/10
Anatomy & construction5.5/103.0/10
Space & placement6.0/104.5/10
Light & reflections5.0/105.5/10
Purposeful detail7.0/106.0/10
Artistry & character6.0/103.0/10
Materials & effects6.0/105.5/10
Visual integrity7.0/105.0/10

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

A coherent pelican cyclist with expressive proportions, purposeful feather detail and developed bicycle machinery. Continuous body contours, aligned wheels and readable pedal contacts support the scene. Simplified articulation, shallow modelling and an unresolved steering connection limit construction and placement.

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 TerraLongCat-2.0
Task & likeness7.0/108.5/10
Anatomy & construction7.0/107.0/10
Space & placement6.0/108.0/10
Light & reflections5.5/107.5/10
Purposeful detail7.0/108.0/10
Artistry & character6.5/108.5/10
Materials & effects5.5/107.0/10
Visual integrity6.0/108.5/10

Benchmark task

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