STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Fledge Alpha vs Kimi K3.1 Pro

Kimi K3.1 Pro leads Fledge Alpha by 20.9 points on StealthMark, 56.7 to 35.8. It leads on 6 of the 7 benchmarks with results for both and Fledge Alpha on 1. Kimi K3.1 Pro scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
Model guide ↗
All results ↗

Overall StealthMark

35.8/100Overall rank 38/53
56.7/100Overall rank 11/53

General Intelligence

27.1/100
53.9/100

Visual Intelligence

45.2/100
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

  • Fledge AlphaMulti-step reasoning not measured

BENCHMARK BY BENCHMARK

Where each model leads

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

DATASHEET

Specs and pricing

Kimi K3.1 Pro scores higher on StealthMark and runs 1.9× faster in our speed test.

  • Fledge Alpha
  • Kimi K3.1 Pro
  • Other models
  • Median
PricePer 1M output tokens, input below
Fledge Alpha: No list priceKimi K3.1 Pro: $10$2 input
Context windowTokens per request, max output below
Fledge Alpha: Not publishedKimi K3.1 Pro: 1M1M max output
Output speedTokens per second, our measurement
Fledge Alpha: 63tokens/sKimi K3.1 Pro: 1171.9× fastertokens/s
SizeTotal and active parameters
Fledge Alpha: Not disclosedKimi K3.1 Pro: 2.8T104B activeEstimated
Developer
Not publishedMoonshot AI
Released
Not published23 Oct 2026
Origin
Not publishedChina
Input → output
Not publishedText, image, video → text
Architecture
Not publishedPost-trained version of Kimi K3, a Mixture-of-Experts model

Full datasheets, every price and sourceKimi 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 K3.1 Pro 61.1/100Rank 10/47

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

Points per level

LevelFledge AlphaKimi K3.1 Pro
Level 1Second Thoughts
No run
15 ptsOut of lives
Level 2Pressure Pot
No run
12 ptsOut of lives
Level 3Hide or Flight
No run
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 K3.1 Pro 81.8/100Rank 8/48

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

Points per level

LevelFledge AlphaKimi K3.1 Pro
Level 1Hold the door
No run
5.2 ptsCleared
Level 2Crossfeed
No run
9.8 ptsCleared
Level 3Relay vault
No run
19.2 ptsCleared
Level 4Passing bay
No run
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
No run
19.8 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Fledge Alpha

The candidate communicates a round metallic sphere, three paint colors and a separate airborne black blob. Its hovering support relationship, displaced framing and unresolved paint interaction limit physical credit. Sparse planar light ghosts and a soft sphere highlight provide little evidence for the required wall/floor repetitions and curved nested mirror imagery.

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

CategoryFledge AlphaKimi K3.1 Pro
State at 600 ms9.0/2523.5/25
Camera and placement5.0/1510.5/15
Reflections7.5/12026.0/120
Materials and scale3.5/107.0/10
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

Fledge Alpha

A coherent, appealing mascot with expressive eyes, a cheerful beak and a readable swept-back silhouette. Its larger forward foot and trailing feathers suggest a running stride, but the upright body, stiff legs and minimally articulated feet limit convincing motion. Clean flat shapes suit the brief, while uneven feather junctions and incomplete cream accents reduce polish.

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

CategoryFledge AlphaKimi K3.1 Pro
Task & likeness7.5/108.0/10
Anatomy & construction6.5/105.5/10
Space & placement7.0/106.5/10
Light & reflections5.5/106.5/10
Purposeful detail6.5/107.5/10
Artistry & character4.0/107.0/10
Materials & effects6.0/107.0/10
Visual integrity6.5/107.0/10

Benchmark task

Fledge Alpha

An eager young seabird running toward the viewer tests expressive anatomy, balance and a convincing forward-moving pose.

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

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Fledge Alpha

A recognizable but basic Mona Lisa reinterpretation with a coherent silhouette and subdued palette. Curtain-like hair obscures much of the face, while elongated facial construction and oversized, minimally articulated hands substantially weaken replication. Soft shading supplies modest volume, but anatomy, landscape depth and purposeful detail remain underdeveloped.

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

CategoryFledge AlphaKimi K3.1 Pro
Task & likeness3.0/105.0/10
Anatomy & construction3.0/105.0/10
Space & placement2.5/105.5/10
Light & reflections2.5/106.0/10
Purposeful detail3.0/105.5/10
Artistry & character3.0/106.0/10
Materials & effects2.5/105.0/10
Visual integrity2.5/106.5/10

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

Fledge Alpha

A cheerful, recognizable sunset beach with a cohesive warm palette and clear accessories. Simple construction, uncertain palm support, an ambiguous upper boundary and schematic reflections limit depth and finish. The scene communicates its subject successfully but lacks the developed forms, lighting and detail of exceptional illustration.

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

CategoryFledge AlphaKimi K3.1 Pro
Task & likeness7.5/108.5/10
Anatomy & construction4.0/105.5/10
Space & placement5.5/105.5/10
Light & reflections5.0/106.5/10
Purposeful detail3.0/106.5/10
Artistry & character3.0/105.5/10
Materials & effects2.5/106.5/10
Visual integrity4.0/107.5/10

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

Fledge Alpha

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

Fledge Alpha

An appealing sunset illustration with recognizable characters and a clear riding action. Color, expression and silhouette are stronger than anatomical construction: overlapping paws obscure support, the dog's steering limb is simplified, and the vehicle controls lack definition. The wake conveys movement, while lighting and water reflections remain decorative.

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

CategoryFledge AlphaKimi K3.1 Pro
Task & likeness8.5/107.0/10
Anatomy & construction5.5/105.5/10
Space & placement7.5/106.0/10
Light & reflections6.5/105.5/10
Purposeful detail7.0/107.0/10
Artistry & character5.5/106.0/10
Materials & effects7.0/106.0/10
Visual integrity4.5/107.0/10

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

Different task instructions

Subject construction and spatial relationships.

The judgment

Fledge Alpha

A clear, cheerful illustration with a recognizable pelican, coherent bicycle silhouette and tidy composition. Simplified leg articulation, steering contact, mechanical detail and lighting keep it at a competent illustrative level.

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

CategoryFledge AlphaKimi K3.1 Pro
Task & likeness8.0/108.5/10
Anatomy & construction6.0/107.5/10
Space & placement6.5/106.5/10
Light & reflections4.5/106.5/10
Purposeful detail5.5/107.5/10
Artistry & character5.0/107.5/10
Materials & effects5.5/106.5/10
Visual integrity6.5/107.5/10

Benchmark task

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