STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Kimi K3 vs Kimi K3.1 Pro

Kimi K3.1 Pro leads Kimi K3 by 6.0 points on StealthMark, 56.7 to 50.7. It leads on 6 of 9 benchmarks, including both games, and Kimi K3 on 3. Kimi K3.1 Pro scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

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All results ↗
All results ↗

Overall StealthMark

50.7/100Overall rank 15/53
56.7/100Overall rank 11/53

General Intelligence

44.5/100
53.9/100

Visual Intelligence

61.7/100
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

BENCHMARK BY BENCHMARK

Where each model leads

  • Kimi K3
  • Kimi K3.1 Pro
  • Other models
  • Median

DATASHEET

Specs and pricing

Kimi K3.1 Pro scores higher on StealthMark and is 8% cheaper per output token. Both take about 1M tokens of context.

  • Kimi K3
  • Kimi K3.1 Pro
  • Other models
  • Median
PricePer 1M output tokens, input below
Kimi K3: $10.80$0.24 inputKimi K3.1 Pro: $108% cheaper$2 input
Context windowTokens per request, max output below
Kimi K3: 1MTied1M max outputKimi K3.1 Pro: 1MTied1M max output
Output speedTokens per second, our measurement
Kimi K3: 115Tiedtokens/sKimi K3.1 Pro: 117Tiedtokens/s
SizeTotal and active parameters
Kimi K3: 2.8T104B activeKimi K3.1 Pro: 2.8T104B activeEstimated
Developer
Moonshot AIBoth
Released
16 Jul 202623 Oct 2026
Origin
ChinaBoth
Input → output
Text, image → textText, image, video → text
Architecture
Mixture-of-Experts with KDA + Gated MLA attention, 896 experts and native vision encoderPost-trained version of Kimi K3, a Mixture-of-Experts model

Full datasheets, every price and sourceKimi K3 ↗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.

Kimi K3 52.7/100Rank 16/47

Survived 0 of 3
Foresight: complete playing field
Level 311 ptsTurn 17 / 20

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

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

Points per level

LevelKimi K3Kimi K3.1 Pro
Level 1Second Thoughts
17 ptsOut of lives
15 ptsOut of lives
Level 2Pressure Pot
10 ptsOut of lives
12 ptsOut of lives
Level 3Hide or Flight
11 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.

Kimi K3 57.7/100Rank 20/48

Cleared 3 of 5
Latch: complete playing field
Level 514.2 ptsTurn 4 / 40

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

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

Points per level

LevelKimi K3Kimi K3.1 Pro
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
9.8 ptsCleared
Level 3Relay vault
18.2 ptsClearedFinished early · 3 beacons left
19.2 ptsCleared
Level 4Passing bay
14.2 ptsFinished early
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
14.2 ptsFinished early
19.8 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Kimi K3

The room fills the complete portrait frame without visible borders or labels. The main sphere and airborne black are convincingly placed within the portrait frame. Paint ordering is supported, but its contact and transport history remains weakly expressed. Symmetric wall ghosts, inverted floor imagery and panel echoes establish a basic mirror system. Diffuse gradients dominate, with little ordered nested imagery or repeated emitter mapping on either planar or spherical surfaces. The wall images sit too low, and the floor image is unusually large and low.

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

CategoryKimi K3Kimi K3.1 Pro
State at 600 ms18.0/2523.5/25
Camera and placement8.0/1510.5/15
Reflections24.0/12026.0/120
Materials and scale6.5/107.0/10
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

Same task instructions

Visual construction and creative interpretation.

The judgment

Kimi K3

The indigo creature and warm reflected counterpart create a balanced, contemplative composition. Equations, constellations and book emblems give the transformation meaning. Clean silhouettes and controlled glow support the scene, but minimally articulated legs, shallow spatial cues and smooth, generalized surfaces limit its anatomical and material richness.

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

CategoryKimi K3Kimi K3.1 Pro
Task & likeness9.0/108.0/10
Anatomy & construction7.0/105.5/10
Space & placement8.0/106.5/10
Light & reflections7.5/106.5/10
Purposeful detail8.0/107.5/10
Artistry & character8.5/107.0/10
Materials & effects7.5/107.0/10
Visual integrity8.0/107.0/10

Benchmark task

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

Kimi K3

The centered portrait, dark veil, folded hands and misty landscape clearly evoke Mona Lisa. Replication is limited by the elongated neck, simplified facial proportions and oval hands with shallow finger marks. Soft shading gives some volume, but pervasive blur substitutes for controlled painterly transitions and precise detail.

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

CategoryKimi K3Kimi K3.1 Pro
Task & likeness4.5/105.0/10
Anatomy & construction3.5/105.0/10
Space & placement4.5/105.5/10
Light & reflections4.5/106.0/10
Purposeful detail4.0/105.5/10
Artistry & character4.5/106.0/10
Materials & effects4.5/105.0/10
Visual integrity5.0/106.5/10

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

Kimi K3

A coordinated sunset palette, expressive silhouettes and varied small details create a lively, appealing beach illustration. The central sun and framing palm and umbrella organize the busy scene, with clean contours preserving readability. Bodies and people remain diagrammatic, depth is shallow, and inverted figure reflections cross matte-looking sand without convincing surface lighting. Materials and movement are mostly conveyed through flat shapes.

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

CategoryKimi K3Kimi K3.1 Pro
Task & likeness8.5/108.5/10
Anatomy & construction7.0/105.5/10
Space & placement7.0/105.5/10
Light & reflections6.5/106.5/10
Purposeful detail8.5/106.5/10
Artistry & character8.5/105.5/10
Materials & effects6.5/106.5/10
Visual integrity7.0/107.5/10

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

Kimi K3

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

Kimi K3

The raccoon rides on the dog's back, and the dog's paw meets a steering assembly connected to the red hull. Expressive faces, a warm sunset and sweeping spray create an appealing composition. Crowded body overlaps obscure some limb connections, and the raccoon's right ear appears slightly separated. Flat shading and stylized reflections limit volume and depth.

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

CategoryKimi K3Kimi K3.1 Pro
Task & likeness8.0/107.0/10
Anatomy & construction7.0/105.5/10
Space & placement7.5/106.0/10
Light & reflections7.0/105.5/10
Purposeful detail7.5/107.0/10
Artistry & character6.5/106.0/10
Materials & effects7.5/106.0/10
Visual integrity7.0/107.0/10

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

Kimi K3

The pelican and bicycle are immediately recognizable, with an expressive bill, flowing scarf and cheerful composition. Both legs remain attached, but pedal connections and wing contact with the handlebar are weakly resolved. Wheel alignment and landscape layers are coherent. Clean outlines support the illustration, while flat surfaces and limited lighting keep it short of masterful execution.

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

CategoryKimi K3Kimi K3.1 Pro
Task & likeness8.0/108.5/10
Anatomy & construction6.5/107.5/10
Space & placement7.5/106.5/10
Light & reflections5.0/106.5/10
Purposeful detail6.5/107.5/10
Artistry & character6.0/107.5/10
Materials & effects6.0/106.5/10
Visual integrity6.5/107.5/10

Benchmark task

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