STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Inkling-Small vs Kimi K3.1 Pro

Kimi K3.1 Pro leads Inkling-Small by 29.1 points on StealthMark, 56.7 to 27.6. It leads on all 9 benchmarks. Kimi K3.1 Pro scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

27.6/100Overall rank 43/53
56.7/100Overall rank 11/53

General Intelligence

25.5/100
53.9/100

Visual Intelligence

31.1/100
62.0/100

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

BENCHMARK BY BENCHMARK

Where each model leads

  • Inkling-Small
  • Kimi K3.1 Pro
  • Other models
  • Median

DATASHEET

Specs and pricing

Both take about 1M tokens of context.

  • Inkling-Small
  • Kimi K3.1 Pro
  • Other models
  • Median
PricePer 1M output tokens, input below
Inkling-Small: No list priceKimi K3.1 Pro: $10$2 input
Context windowTokens per request, max output below
Inkling-Small: 1MTiedKimi K3.1 Pro: 1MTied1M max output
Output speedTokens per second, our measurement
Inkling-Small: Not measuredKimi K3.1 Pro: 117tokens/s
SizeTotal and active parameters
Inkling-Small: 276B12B activeKimi K3.1 Pro: 2.8T104B activeEstimated
Developer
Thinking Machines LabMoonshot AI
Released
Not published23 Oct 2026
Origin
Not publishedChina
Input → output
Text, image, audio → textText, image, video → 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 audioPost-trained version of Kimi K3, a Mixture-of-Experts model

Full datasheets, every price and sourceInkling-Small ↗Kimi K3.1 Pro ↗

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

Kimi K3.1 Pro 61.1/100Rank 10/49

Survived 1 of 3
Foresight: complete playing field
Level 315 ptsTurn 20 / 20

Points per level

LevelInkling-SmallKimi K3.1 Pro
Level 1Second Thoughts
9 ptsOut of lives
15 ptsOut of lives
Level 2Pressure Pot
6 ptsOut of lives
12 ptsOut of lives
Level 3Hide or Flight
8 ptsOut of lives
15 ptsSurvived

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

Kimi K3.1 Pro 81.8/100Rank 9/50

Cleared 5 of 5
Latch: complete playing field
Level 519.8 ptsTurn 31 / 40

Points per level

LevelInkling-SmallKimi K3.1 Pro
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9.8 ptsCleared
Level 3Relay vault
2.8 ptsFinished early
19.2 ptsCleared
Level 4Passing bay
8 ptsFinished early
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
18 ptsCleared
19.8 ptsCleared

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.

Kimi K3.1 Pro

The settled sphere, separate airborne black paint and crimson-before-cyan interaction are supported, with a modest crimson travel overshoot. A shared downward framing displacement remains after accounting for the square canvas. The principal limitation is the reflection system: sparse sphere copies and generic curved bands omit most of the ordered mirror-room structure. Materials receive a small upward revision because bounded bright images and dark bands visibly establish some polish, while soft shading and bulky paint remain separate weaknesses.

Score breakdown

CategoryInkling-SmallKimi K3.1 Pro
State at 600 ms14.0/2523.5/25
Camera and placement3.0/1510.5/15
Reflections8.0/12026.0/120
Materials and scale2.5/107.0/10
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.

Kimi K3.1 Pro

The transformed reflection, attentive pose and constellation anatomy clearly communicate introspection. Purposeful fine details enrich a coherent composition. Tubular limbs, crowded lower-body overlaps, shallow depth and limited cast lighting keep the overall execution within the competent range.

Score breakdown

CategoryInkling-SmallKimi K3.1 Pro
Task & likeness2.5/108.0/10
Anatomy & construction1.5/105.5/10
Space & placement3.5/106.5/10
Light & reflections3.0/106.5/10
Purposeful detail4.5/107.5/10
Artistry & character3.0/107.0/10
Materials & effects3.5/107.0/10
Visual integrity2.0/107.0/10

Benchmark task

Inkling-Small

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

Kimi K3.1 Pro

An imagined creature encounters its reflection. The scene tests original character design, visual self-interpretation and the relationship between a subject and its reflected image.

Mona Lisa

Same 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.

Kimi K3.1 Pro

A coherent, recognizable interpretation with controlled color and readable landscape layers. Replication is limited by the frontal seated construction, elongated facial proportions and oversized, weakly articulated hands. Smooth shading supplies some volume but little of the reference's subtle expression, fabric structure or atmospheric transitions.

Score breakdown

CategoryInkling-SmallKimi K3.1 Pro
Task & likeness2.5/105.0/10
Anatomy & construction2.5/105.0/10
Space & placement3.0/105.5/10
Light & reflections2.5/106.0/10
Purposeful detail2.0/105.5/10
Artistry & character2.5/106.0/10
Materials & effects2.0/105.0/10
Visual integrity3.0/106.5/10

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

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.

Kimi K3.1 Pro

A coherent, playful beach illustration with readable animals, an organized composition and an aligned sunset reflection. Connected silhouettes, sand texture and atmospheric effects demonstrate controlled execution. Simplified joints, flattened foreground viewpoints and inconsistent shadows limit anatomical and spatial credibility.

Score breakdown

CategoryInkling-SmallKimi K3.1 Pro
Task & likeness3.5/108.5/10
Anatomy & construction3.0/105.5/10
Space & placement3.0/105.5/10
Light & reflections3.0/106.5/10
Purposeful detail3.0/106.5/10
Artistry & character3.0/105.5/10
Materials & effects2.5/106.5/10
Visual integrity2.0/107.5/10

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.

Kimi K3.1 Pro

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

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.

Kimi K3.1 Pro

The additional comparisons support retaining the assessment. Readable steering, shaped animal contours and purposeful details coexist with simplified joints, a frontal passenger whose seated weight is weakly conveyed, and limited physical lighting. The angled craft establishes more depth than the riding pose resolves.

Score breakdown

CategoryInkling-SmallKimi K3.1 Pro
Task & likeness4.0/107.0/10
Anatomy & construction3.0/105.5/10
Space & placement4.0/106.0/10
Light & reflections5.0/105.5/10
Purposeful detail5.5/107.0/10
Artistry & character4.0/106.0/10
Materials & effects5.0/106.0/10
Visual integrity5.0/107.0/10

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

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.

Kimi K3.1 Pro

A characterful coastal illustration with controlled contours and varied feather, accessory and bicycle detail. Layered scenery and subtle shading enrich the presentation. Soft leg articulation, unresolved riding contacts, shallow depth and generalized lighting limit physical precision.

Score breakdown

CategoryInkling-SmallKimi K3.1 Pro
Task & likeness4.0/108.5/10
Anatomy & construction3.0/107.5/10
Space & placement3.0/106.5/10
Light & reflections3.0/106.5/10
Purposeful detail4.5/107.5/10
Artistry & character5.0/107.5/10
Materials & effects4.5/106.5/10
Visual integrity3.0/107.5/10

Benchmark task

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