STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Kimi K3.1 Pro vs GLM-5.3-Flash

Kimi K3.1 Pro leads GLM-5.3-Flash by 7.9 points on StealthMark, 56.7 to 48.8. It leads on 5 of 9 benchmarks, including both games, and GLM-5.3-Flash on 4. Kimi K3.1 Pro scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

See the difference ↘
All results ↗
Model guide ↗

Overall StealthMark

56.7/100Overall rank 11/53
48.8/100Overall rank 19/53

General Intelligence

53.9/100
42.2/100

Visual Intelligence

62.0/100
59.4/100

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

Open or local

Local modelOpen model · MIT

BENCHMARK BY BENCHMARK

Where each model leads

  • Kimi K3.1 Pro
  • GLM-5.3-Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

Kimi K3.1 Pro scores higher on StealthMark and runs 31% faster in our speed test. GLM-5.3-Flash is 20× cheaper per output token. Both take about 1M tokens of context.

  • Kimi K3.1 Pro
  • GLM-5.3-Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
Kimi K3.1 Pro: $10$2 inputGLM-5.3-Flash: $0.5020× cheaper$0.15 input
Context windowTokens per request, max output below
Kimi K3.1 Pro: 1MTied1M max outputGLM-5.3-Flash: 1MTied131K max output
Output speedTokens per second, our measurement
Kimi K3.1 Pro: 11731% fastertokens/sGLM-5.3-Flash: 89tokens/s
SizeTotal and active parameters
Kimi K3.1 Pro: 2.8T104B activeEstimatedGLM-5.3-Flash: 320B18B active
Developer
Moonshot AIZ.AI
Released
23 Oct 202626 Aug 2026
Origin
ChinaNot published
Input → output
Text, image, video → textText, image → text
Architecture
Post-trained version of Kimi K3, a Mixture-of-Experts modelHybrid sparse and linear attention MoE

Full datasheets, every price and sourceKimi K3.1 Pro ↗GLM-5.3-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

GLM-5.3-Flash 49.0/100Rank 27/472 of 3 levels

2 of 3 played
Foresight: complete playing field
Level 316 ptsTurn 20 / 20

Points per level

LevelKimi K3.1 ProGLM-5.3-Flash
Level 1Second Thoughts
15 ptsOut of lives
9 ptsOut of lives
Level 2Pressure Pot
12 ptsOut of lives
Pending
Level 3Hide or Flight
15 ptsSurvived
16 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 K3.1 Pro 81.8/100Rank 8/48

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

GLM-5.3-Flash 4.0/100Rank 48/483 of 5 levels

3 of 5 played
Latch: complete playing field
Level 30.6 ptsTurn 33 / 36

Points per level

LevelKimi K3.1 ProGLM-5.3-Flash
Level 1Hold the door
5.2 ptsCleared
4.4 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
5.2 ptsFinished early
Level 3Relay vault
19.2 ptsCleared
0.6 ptsFinished early
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
Pending
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.

GLM-5.3-Flash

The setup is recognizable, but the paint interaction remains poorly established and off-center. The first wall and floor images provide coherent placement, scale, silhouette and occlusion cues, with faint lower echoes. Missing receding chains, nested imagery and ordered emitter mappings leave the reflection system heavily simplified. Dull shading does not convincingly depict polished steel or mirrors.

Score breakdown

CategoryKimi K3.1 ProGLM-5.3-Flash
State at 600 ms23.5/2514.0/25
Camera and placement10.5/159.0/15
Reflections26.0/12021.5/120
Materials and scale7.0/103.5/10
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

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.

GLM-5.3-Flash

The expressive emerald face, ivory horns, gold accents and fine veining closely match the brief. Rounded volumes and layered shading create an appealing mascot. Rear hoof placement is cramped, lighting is somewhat inconsistent, and conspicuous white patches behind the muzzle interrupt the finish. Surfaces remain visibly stylized rather than photographic.

Score breakdown

CategoryKimi K3.1 ProGLM-5.3-Flash
Task & likeness8.0/108.5/10
Anatomy & construction5.5/107.5/10
Space & placement6.5/107.5/10
Light & reflections6.5/108.0/10
Purposeful detail7.5/107.5/10
Artistry & character7.0/107.5/10
Materials & effects7.0/107.5/10
Visual integrity7.0/107.0/10

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.

GLM-5.3-Flash

A rounded jade bull raising a hoof tests anatomy, balance and the appearance of polished stone and metal.

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.

GLM-5.3-Flash

The crossed arms, green dress and hazy landscape clearly evoke Mona Lisa. Replication is limited by the frontal pose, oversized eyes, elongated face and pronounced lips. Overlapping finger strips lack convincing knuckles and palm volume. The balanced framing and soft shading provide cohesion, but simplified anatomy, repetitive folds and blurred scenery keep the portrait basic.

Score breakdown

CategoryKimi K3.1 ProGLM-5.3-Flash
Task & likeness5.0/104.5/10
Anatomy & construction5.0/104.5/10
Space & placement5.5/106.0/10
Light & reflections6.0/106.0/10
Purposeful detail5.5/105.0/10
Artistry & character6.0/105.0/10
Materials & effects5.0/105.5/10
Visual integrity6.5/104.0/10

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

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.

GLM-5.3-Flash

Framing palms, a vivid sunset palette and balanced kite and umbrella create an appealing beach illustration. Layered water and shoreline give the scene depth, while aligned reflections reinforce the sunset. Small accessories add character and reward inspection. Figures and animals remain schematic, some overlaps are difficult to read, and simplified shadows and flat surfaces limit physical richness.

Score breakdown

CategoryKimi K3.1 ProGLM-5.3-Flash
Task & likeness8.5/108.0/10
Anatomy & construction5.5/107.0/10
Space & placement5.5/108.0/10
Light & reflections6.5/108.0/10
Purposeful detail6.5/108.0/10
Artistry & character5.5/108.5/10
Materials & effects6.5/106.5/10
Visual integrity7.5/108.0/10

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.

GLM-5.3-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

Different 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.

GLM-5.3-Flash

Recognizable animals, a supported riding pose and an energetic diagonal composition make the scene readable. Character details and spray strengthen its appeal. Simple limb construction, limited directional lighting and an unresolved steering connection constrain the drawing's physical precision and complexity.

Score breakdown

CategoryKimi K3.1 ProGLM-5.3-Flash
Task & likeness7.0/107.0/10
Anatomy & construction5.5/105.0/10
Space & placement6.0/106.0/10
Light & reflections5.5/105.0/10
Purposeful detail7.0/106.5/10
Artistry & character6.0/104.0/10
Materials & effects6.0/106.0/10
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

Different 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.

GLM-5.3-Flash

The pelican, bicycle and seaside setting form a clear, appealing illustration. Circular wheels, readable frame tubes and clean silhouettes support the action. The legs connect to the body, but the far foot's pedal contact and wing-to-handlebar junction are cramped. Simple shading, uniform wave marks and limited surface texture keep the rendering relatively flat.

Score breakdown

CategoryKimi K3.1 ProGLM-5.3-Flash
Task & likeness8.5/108.5/10
Anatomy & construction7.5/107.5/10
Space & placement6.5/107.5/10
Light & reflections6.5/106.5/10
Purposeful detail7.5/107.0/10
Artistry & character7.5/108.0/10
Materials & effects6.5/106.5/10
Visual integrity7.5/108.0/10

Benchmark task

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