STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Kimi K3.1 Pro vs Ling 3.1 Flash

Kimi K3.1 Pro leads Ling 3.1 Flash by 14.5 points on StealthMark, 56.7 to 42.2. It leads on 6 of 9 benchmarks, including both games, and Ling 3.1 Flash on 3. Kimi K3.1 Pro scores higher on Ground Truth.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

56.7/100Overall rank 11/53
42.2/100Overall rank 32/53

General Intelligence

53.9/100
35.5/100

Visual Intelligence

62.0/100
51.2/100

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

Open or local

Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • Kimi K3.1 Pro
  • Ling 3.1 Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

Kimi K3.1 Pro scores higher on StealthMark and takes 4× more context. Ling 3.1 Flash is 11× cheaper per output token.

  • Kimi K3.1 Pro
  • Ling 3.1 Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
Kimi K3.1 Pro: $10$2 inputLing 3.1 Flash: $0.9011× cheaper$0.30 input
Context windowTokens per request, max output below
Kimi K3.1 Pro: 1M4× larger1M max outputLing 3.1 Flash: 256K
Output speedTokens per second, our measurement
Kimi K3.1 Pro: 117Tiedtokens/sLing 3.1 Flash: 115Tiedtokens/s
SizeTotal and active parameters
Kimi K3.1 Pro: 2.8T104B activeEstimatedLing 3.1 Flash: 560B25B active
Developer
Moonshot AIInclusionAI
Released
23 Oct 202629 Sep 2026
Origin
ChinaBoth
Input → output
Text, image, video → textText → text
Architecture
Post-trained version of Kimi K3, a Mixture-of-Experts modelHybrid-linear MoE; 72 layers (63 KDA, 9 gated MLA); 512 routed experts, 8 selected and 1 shared.

Full datasheets, every price and sourceKimi K3.1 Pro ↗Ling 3.1 Flash ↗

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.

Kimi K3.1 Pro 61.1/100Rank 10/47

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

Ling 3.1 Flash 43.1/100Rank 42/471 of 3 levels

1 of 3 played
Foresight: complete playing field
Level 26 ptsTurn 14 / 18

Points per level

LevelKimi K3.1 ProLing 3.1 Flash
Level 1Second Thoughts
15 ptsOut of lives
Pending
Level 2Pressure Pot
12 ptsOut of lives
6 ptsOut of lives
Level 3Hide or Flight
15 ptsSurvived
Not played

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.

Kimi K3.1 Pro 81.8/100Rank 8/48

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

Ling 3.1 Flash 45.9/100Rank 36/483 of 5 levels

3 of 5 played
Latch: complete playing field
Level 49.8 ptsTurn 21 / 40

Points per level

LevelKimi K3.1 ProLing 3.1 Flash
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9.4 ptsCleared
Level 3Relay vault
19.2 ptsCleared
Pending
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
9.8 ptsFinished early
Level 5Second thoughts
19.8 ptsCleared
Not played

Newton's Mirror

Same task instructions

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

The judgment

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.

Ling 3.1 Flash

Central placement, separate airborne black paint and the elongated crimson coating earn substantial state and placement credit. Cyan contact remains unresolved. A few isolated sphere images provide limited optical evidence, while the defining repeated mirror structure is missing. Readable opaque metallic volume and restrained paint scale justify increased material credit. Core: 61.5/170; including the floor reward: 61.5/180.

Score breakdown

CategoryKimi K3.1 ProLing 3.1 Flash
State at 600 ms23.5/2522.0/25
Camera and placement10.5/1513.5/15
Reflections26.0/12018.0/120
Materials and scale7.0/107.0/10
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

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.

Ling 3.1 Flash

An appealing, coherent storybook ant with a clear expression, complete silhouette and readable signal mechanism. Clean curves and warm accents support the composition, while simplified joints, schematic hardware, limited material differentiation and modest light interaction constrain its finish.

Score breakdown

CategoryKimi K3.1 ProLing 3.1 Flash
Task & likeness8.0/107.5/10
Anatomy & construction5.5/107.5/10
Space & placement6.5/107.0/10
Light & reflections6.5/107.5/10
Purposeful detail7.5/107.0/10
Artistry & character7.0/107.0/10
Materials & effects7.0/106.5/10
Visual integrity7.0/108.0/10

Benchmark task

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.

Ling 3.1 Flash

An ant tending signals in a miniature workshop tests insect anatomy, purposeful gestures and the placement of small objects in a lit environment.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

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.

Ling 3.1 Flash

A basic, uneven Mona Lisa interpretation with a clear facial focal point, articulated eyes and modest tonal volume. Weak likeness, oversized head proportions, unclear shoulders, curled bare arms and indistinct hands limit replication. The compressed composition and rectangular torso weaken an otherwise coherent earthy palette.

Score breakdown

CategoryKimi K3.1 ProLing 3.1 Flash
Task & likeness5.0/102.0/10
Anatomy & construction5.0/101.5/10
Space & placement5.5/104.0/10
Light & reflections6.0/103.5/10
Purposeful detail5.5/103.5/10
Artistry & character6.0/102.0/10
Materials & effects5.0/101.5/10
Visual integrity6.5/102.0/10

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

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.

Ling 3.1 Flash

A coherent sunset illustration with harmonious color, clean silhouettes and readable beach details. Its calm composition works well, while playful activity is modest. Simplified animal anatomy, shallow shoreline layering, repetitive foliage and a geometric reflection limit drawing sophistication and naturalism.

Score breakdown

CategoryKimi K3.1 ProLing 3.1 Flash
Task & likeness8.5/107.5/10
Anatomy & construction5.5/106.0/10
Space & placement5.5/107.0/10
Light & reflections6.5/107.0/10
Purposeful detail6.5/106.5/10
Artistry & character5.5/106.5/10
Materials & effects6.5/106.5/10
Visual integrity7.5/106.0/10

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

Kimi K3.1 Pro

This benchmark has not been assessed yet.

Ling 3.1 Flash

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

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.

Ling 3.1 Flash

An appealing sunset cartoon with recognizable animals, expressive faces and coherent landscape layers. The sky and warm water streaks provide its strongest rendering. Ambiguous seated support, stiff forelegs, a shallow hull and an unclear steering connection limit construction. Clean shapes and readable accessories add finish, while restrained spray and flat surfaces limit material and motion effects.

Score breakdown

CategoryKimi K3.1 ProLing 3.1 Flash
Task & likeness7.0/107.5/10
Anatomy & construction5.5/105.5/10
Space & placement6.0/107.0/10
Light & reflections5.5/107.0/10
Purposeful detail7.0/107.0/10
Artistry & character6.0/105.5/10
Materials & effects6.0/105.5/10
Visual integrity7.0/106.0/10

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

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.

Ling 3.1 Flash

A clean, appealing pelican illustration with a readable bicycle and coherent landscape. Bill shading, feather layers and faint wheel shadows provide modest depth. Uncertain pedal contact, simplified leg construction and limited material rendering keep the result within competent illustration quality.

Score breakdown

CategoryKimi K3.1 ProLing 3.1 Flash
Task & likeness8.5/107.5/10
Anatomy & construction7.5/105.5/10
Space & placement6.5/107.0/10
Light & reflections6.5/106.5/10
Purposeful detail7.5/106.0/10
Artistry & character7.5/106.5/10
Materials & effects6.5/106.5/10
Visual integrity7.5/106.0/10

Benchmark task

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