STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Inkling-Small vs LongCat-2.0

Inkling-Small leads LongCat-2.0 by 2.1 points on StealthMark, 27.6 to 25.5. LongCat-2.0 leads on 5 of the 7 benchmarks with results for both and Inkling-Small on 2. Owl Alpha scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
Model guide ↗

Overall StealthMark

27.6/100Overall rank 43/53
25.5/100Overall rank 45/53

General Intelligence

25.5/100
17.2/100

Visual Intelligence

31.1/100
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

  • Inkling-Small
  • LongCat-2.0Multi-step reasoning not measured

Open or local

Open modelApache 2.0
Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • Inkling-Small
  • LongCat-2.0
  • Other models
  • Median

DATASHEET

Specs and pricing

Both take about 1M tokens of context.

  • Inkling-Small
  • LongCat-2.0
  • Other models
  • Median
PricePer 1M output tokens, input below
Inkling-Small: No list priceLongCat-2.0: $1.20$0.30 input
Context windowTokens per request, max output below
Inkling-Small: 1MTiedLongCat-2.0: 1MTied
Output speedTokens per second, our measurement
Inkling-Small: Not measuredLongCat-2.0: 86tokens/s
SizeTotal and active parameters
Inkling-Small: 276B12B activeLongCat-2.0: Not disclosed
Developer
Thinking Machines LabMeituan
Origin
Not publishedChina
Input → output
Text, image, audio → textText → text
Architecture
42-layer decoder-only transformer with sparse mixture-of-experts feed-forward (6 of 256 routed experts plus 2 shared per token); hybrid local and global attention; natively multimodal with a hierarchical patch image encoder and discrete-token audioMixture-of-Experts with LongCat Sparse Attention

Full datasheets, every price and sourceInkling-Small ↗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.

Inkling-Small 30.2/100Rank 29/49

Survived 0 of 3
Foresight: complete playing field
Level 38 ptsTurn 17 / 20

Points per level

LevelInkling-SmallLongCat-2.0
Level 1Second Thoughts
9 ptsOut of lives
No run
Level 2Pressure Pot
6 ptsOut of lives
No run
Level 3Hide or Flight
8 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.

Inkling-Small 34.7/100Rank 34/50

Cleared 3 of 5
Latch: complete playing field
Level 518 ptsTurn 40 / 40

Points per level

LevelInkling-SmallLongCat-2.0
Level 1Hold the door
5.2 ptsCleared
No run
Level 2Crossfeed
9.8 ptsCleared
No run
Level 3Relay vault
2.8 ptsFinished early
No run
Level 4Passing bay
8 ptsFinished early
No run
Level 5Second thoughts
18 ptsCleared
No run

Newton's Mirror

Same task instructions

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

The judgment

Inkling-Small

The sphere's apparent floor support, separate dark feature and broad paint ordering justify partial state credit. The major weakness is the largely missing mirror system: isolated side images and faint floor echoes do not establish repeated virtual rooms or curved spherical mapping. Downward framing, the oversized frontal panel, unresolved paint transport and satin surface appearance remain distinct limitations.

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

CategoryInkling-SmallLongCat-2.0
State at 600 ms14.0/259.5/25
Camera and placement3.0/156.5/15
Reflections8.0/12012.5/120
Materials and scale2.5/105.5/10
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

Inkling-Small

The faces and dripping caps communicate a cute mushroom scene, but simple construction and weak spatial relationships limit the result. The defining foot-stamping action is unresolved, the flattering portrait is smaller than its painter, and the requested material contrasts are only partly conveyed.

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

CategoryInkling-SmallLongCat-2.0
Task & likeness2.5/107.0/10
Anatomy & construction1.5/106.0/10
Space & placement3.5/106.0/10
Light & reflections3.0/105.5/10
Purposeful detail4.5/106.0/10
Artistry & character3.0/106.5/10
Materials & effects3.5/105.5/10
Visual integrity2.0/106.5/10

Benchmark task

Inkling-Small

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

Inkling-Small

A recognizable but rudimentary Mona Lisa interpretation. Facial shading and subdued colors provide coherence, while the frontal blocklike torso, unresolved wrists, fingerless hands and shallow landscape substantially limit likeness, construction and finish.

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

CategoryInkling-SmallLongCat-2.0
Task & likeness2.5/100.5/10
Anatomy & construction2.5/100.5/10
Space & placement3.0/100.5/10
Light & reflections2.5/100.5/10
Purposeful detail2.0/100.0/10
Artistry & character2.5/100.5/10
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

Inkling-Small

A recognizable sunset beach with a clear focal sun and appealing color transitions. Connected fish silhouettes and layered scenery establish basic coherence. Primitive figures, ambiguous recreation, sparse descriptive detail and weak grounding limit construction and depth. The aligned reflection supplies a useful lighting cue, but shadows and material effects remain underdeveloped.

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

CategoryInkling-SmallLongCat-2.0
Task & likeness3.5/107.5/10
Anatomy & construction3.0/105.5/10
Space & placement3.0/105.5/10
Light & reflections3.0/106.0/10
Purposeful detail3.0/105.0/10
Artistry & character3.0/105.0/10
Materials & effects2.5/103.0/10
Visual integrity2.0/104.0/10

Benchmark task

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

Ground Truth

Same task instructions

Physical reasoning, light and visual reconstruction.

The judgment

Inkling-Small

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

Inkling-Small

Recognizable animals, readable accessories and an appealing sunset support a coherent basic cartoon. Rounded construction leaves joints, riding support and steering unresolved. Decorative gradients contribute atmosphere, but directional lighting, distinct materials and convincing water displacement are weakly demonstrated.

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

CategoryInkling-SmallLongCat-2.0
Task & likeness4.0/104.0/10
Anatomy & construction3.0/103.0/10
Space & placement4.0/104.5/10
Light & reflections5.0/105.5/10
Purposeful detail5.5/106.0/10
Artistry & character4.0/103.0/10
Materials & effects5.0/105.5/10
Visual integrity5.0/105.0/10

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

Inkling-Small

The pelican is immediately recognizable, and its sweeping neck, shaped bill and orderly spokes provide character. Riding remains only partially realized: legs, pedal engagement, steering and seat support cannot be read confidently. Controlled graphic effects add atmosphere, but simplified construction and weak grounding keep the result basic.

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

CategoryInkling-SmallLongCat-2.0
Task & likeness4.0/108.5/10
Anatomy & construction3.0/107.0/10
Space & placement3.0/108.0/10
Light & reflections3.0/107.5/10
Purposeful detail4.5/108.0/10
Artistry & character5.0/108.5/10
Materials & effects4.5/107.0/10
Visual integrity3.0/108.5/10

Benchmark task

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