STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Iceman Contributor vs LongCat-2.0

LongCat-2.0 leads Iceman Contributor by 6.3 points on StealthMark, 25.5 to 19.2. It leads on 5 of the 7 benchmarks with results for both and Iceman Contributor on 2. Owl Alpha scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

See the difference ↘
Model guide ↗
Model guide ↗

Overall StealthMark

19.2/100Overall rank 47/53
25.5/100Overall rank 45/53

General Intelligence

11.7/100
17.2/100

Visual Intelligence

31.0/100
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

  • Iceman Contributor
  • LongCat-2.0
  • Other models
  • Median

DATASHEET

Specs and pricing

LongCat-2.0 scores higher on StealthMark and runs 1.9× faster in our speed test.

  • Iceman Contributor
  • LongCat-2.0
  • Other models
  • Median
PricePer 1M output tokens, input below
Iceman Contributor: No list priceLongCat-2.0: $1.20$0.30 input
Context windowTokens per request, max output below
Iceman Contributor: Not publishedLongCat-2.0: 1M
Output speedTokens per second, our measurement
Iceman Contributor: 46tokens/sLongCat-2.0: 861.9× fastertokens/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.

Iceman Contributor 3.2/100Rank 47/47

Survived 0 of 3
Foresight: complete playing field
Level 31 ptsTurn 7 / 20

Points per level

LevelIceman ContributorLongCat-2.0
Level 1Second Thoughts
0 ptsOut of lives
No run
Level 2Pressure Pot
3 ptsOut of lives
No run
Level 3Hide or Flight
1 ptsOut of lives
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.

Iceman Contributor 3.6/100Rank 44/48

Cleared 1 of 5
Latch: complete playing field
Level 55 ptsTurn 25 / 40

Points per level

LevelIceman ContributorLongCat-2.0
Level 1Hold the door
5.2 ptsCleared
No run
Level 2Crossfeed
2.8 ptsFinished early
No run
Level 3Relay vault
2.2 ptsFinished early
No run
Level 4Passing bay
4 ptsFinished early
No run
Level 5Second thoughts
5 ptsFinished early
No run

Newton's Mirror

Same task instructions

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

The judgment

Iceman Contributor

The image provides limited evidence through rounded volume, faint wall strips and floor echoes. Its main sphere is small and low, the paint beads do not establish the required interaction history, and most of the defining mirror structure is missing.

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

CategoryIceman ContributorLongCat-2.0
State at 600 ms0.5/259.5/25
Camera and placement2.5/156.5/15
Reflections7.5/12012.5/120
Materials and scale3.0/105.5/10
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

Iceman Contributor

The crystal crown, cyan eyes and blue faceting communicate an icy fantasy character. Anatomical readability is substantially weaker: the ringed torso, crowded facial construction and fingerless appendages do not resolve the requested childlike crouch or pouncing gesture. Sparse surface detail and shallow shading further limit 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

CategoryIceman ContributorLongCat-2.0
Task & likeness4.0/107.0/10
Anatomy & construction3.0/106.0/10
Space & placement4.0/106.0/10
Light & reflections4.5/105.5/10
Purposeful detail4.0/106.0/10
Artistry & character4.5/106.5/10
Materials & effects4.5/105.5/10
Visual integrity4.0/106.5/10

Benchmark task

Iceman Contributor

Character scenes test expression, anatomy, materials and coherent visual construction.

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

Iceman Contributor

The portrait retains a dark silhouette against an earthy landscape, but replication is weak. The frontal body, elongated facial proportions and undifferentiated hands lose the reference's defining pose and likeness. Basic gradients and layered hills provide some coherence, with little anatomical or painterly detail.

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

CategoryIceman ContributorLongCat-2.0
Task & likeness1.5/100.5/10
Anatomy & construction1.5/100.5/10
Space & placement2.5/100.5/10
Light & reflections2.0/100.5/10
Purposeful detail2.0/100.0/10
Artistry & character2.0/100.5/10
Materials & effects2.0/100.0/10
Visual integrity3.0/100.5/10

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

Iceman Contributor

A coherent sunset beach with recognizable animals, playful details and effective palm framing. Connected silhouettes and layered scenery support modest construction and placement credit. Jointless figures, limited foreshortening and an inadequately separated sun and reflection keep the execution basic despite its attractive color.

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

CategoryIceman ContributorLongCat-2.0
Task & likeness7.0/107.5/10
Anatomy & construction3.5/105.5/10
Space & placement6.0/105.5/10
Light & reflections4.0/106.0/10
Purposeful detail5.5/105.0/10
Artistry & character3.5/105.0/10
Materials & effects4.5/103.0/10
Visual integrity5.0/104.0/10

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

Ground Truth

Different task instructions

Physical reasoning, light and visual reconstruction.

The judgment

Iceman Contributor

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

Iceman Contributor

The sunset palette and red hull establish an appealing setting, but the central interaction remains unresolved. Overlapping bodies obscure the dog, supported seating is unclear, and no readable paw-to-control grip demonstrates steering. Simple construction, weak environmental lighting and loosely described spray limit depth and finish.

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

CategoryIceman ContributorLongCat-2.0
Task & likeness2.0/104.0/10
Anatomy & construction3.0/103.0/10
Space & placement3.0/104.5/10
Light & reflections4.0/105.5/10
Purposeful detail3.5/106.0/10
Artistry & character2.5/103.0/10
Materials & effects4.0/105.5/10
Visual integrity2.5/105.0/10

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

Iceman Contributor

A recognizable pelican and bicycle sit within an appealing sunset composition. Feather contours, bill shape and atmospheric colour provide character, but disconnected-looking leg origins, unclear pedal contact and unresolved steering weaken the central riding action. Consistent wheel alignment establishes a side view without resolving the rider's support.

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

CategoryIceman ContributorLongCat-2.0
Task & likeness4.0/108.5/10
Anatomy & construction3.5/107.0/10
Space & placement3.5/108.0/10
Light & reflections5.0/107.5/10
Purposeful detail4.5/108.0/10
Artistry & character3.5/108.5/10
Materials & effects4.0/107.0/10
Visual integrity3.0/108.5/10

Benchmark task

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