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 ↘Overall StealthMark
General Intelligence
Visual Intelligence
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
Games
SVG
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
- 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 ↗
Foresight
Play Foresight yourselfAnticipating 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

Points per level
Latch
Play Latch yourselfCooperative 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.
Fledge AlphaNo run
Kimi K3.1 Pro 81.8/100Rank 8/48

Points per level
Newton's Mirror
Same task instructionsPhysics, perspective and recursive reflections, tested together. Explore the test ↗
Fledge Alpha 16.4/100 Rank 42/53

Kimi K3.1 Pro 41.1/100 Rank 12/53

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
| Category | Fledge Alpha | Kimi K3.1 Pro |
|---|---|---|
| State at 600 ms | 9.0/25 | 23.5/25 |
| Camera and placement | 5.0/15 | 10.5/15 |
| Reflections | 7.5/120 | 26.0/120 |
| Materials and scale | 3.5/10 | 7.0/10 |
| Floor-damage reward | 0.0/10 | 0.0/10 |
Benchmark task
A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.
Selfie
Different task instructionsVisual construction and creative interpretation.
Fledge Alpha 61.1/100 Rank 30/53

Kimi K3.1 Pro 67.4/100 Rank 21/53

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
| Category | Fledge Alpha | Kimi K3.1 Pro |
|---|---|---|
| Task & likeness | 7.5/10 | 8.0/10 |
| Anatomy & construction | 6.5/10 | 5.5/10 |
| Space & placement | 7.0/10 | 6.5/10 |
| Light & reflections | 5.5/10 | 6.5/10 |
| Purposeful detail | 6.5/10 | 7.5/10 |
| Artistry & character | 4.0/10 | 7.0/10 |
| Materials & effects | 6.0/10 | 7.0/10 |
| Visual integrity | 6.5/10 | 7.0/10 |
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 instructionsPrecise visual recall and portrait reconstruction.
Fledge Alpha 28.3/100 Rank 35/53

Kimi K3.1 Pro 55.3/100 Rank 9/53

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
| Category | Fledge Alpha | Kimi K3.1 Pro |
|---|---|---|
| Task & likeness | 3.0/10 | 5.0/10 |
| Anatomy & construction | 3.0/10 | 5.0/10 |
| Space & placement | 2.5/10 | 5.5/10 |
| Light & reflections | 2.5/10 | 6.0/10 |
| Purposeful detail | 3.0/10 | 5.5/10 |
| Artistry & character | 3.0/10 | 6.0/10 |
| Materials & effects | 2.5/10 | 5.0/10 |
| Visual integrity | 2.5/10 | 6.5/10 |
Benchmark task
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Beach
Different task instructionsCreativity, perspective and visual beauty.
Fledge Alpha 43.4/100 Rank 47/53

Kimi K3.1 Pro 64.3/100 Rank 24/53

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
| Category | Fledge Alpha | Kimi K3.1 Pro |
|---|---|---|
| Task & likeness | 7.5/10 | 8.5/10 |
| Anatomy & construction | 4.0/10 | 5.5/10 |
| Space & placement | 5.5/10 | 5.5/10 |
| Light & reflections | 5.0/10 | 6.5/10 |
| Purposeful detail | 3.0/10 | 6.5/10 |
| Artistry & character | 3.0/10 | 5.5/10 |
| Materials & effects | 2.5/10 | 6.5/10 |
| Visual integrity | 4.0/10 | 7.5/10 |
Benchmark task
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Ground Truth
Same task instructionsPhysical reasoning, light and visual reconstruction.
Fledge Alpha 36.8/100 Rank 33/53

Kimi K3.1 Pro 45.3/100 Rank 17/53

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 instructionsScene composition and interacting subjects.
Fledge Alpha 63.4/100 Rank 20/53

Kimi K3.1 Pro 61.8/100 Rank 24/53

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
| Category | Fledge Alpha | Kimi K3.1 Pro |
|---|---|---|
| Task & likeness | 8.5/10 | 7.0/10 |
| Anatomy & construction | 5.5/10 | 5.5/10 |
| Space & placement | 7.5/10 | 6.0/10 |
| Light & reflections | 6.5/10 | 5.5/10 |
| Purposeful detail | 7.0/10 | 7.0/10 |
| Artistry & character | 5.5/10 | 6.0/10 |
| Materials & effects | 7.0/10 | 6.0/10 |
| Visual integrity | 4.5/10 | 7.0/10 |
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 instructionsSubject construction and spatial relationships.
Fledge Alpha 60.5/100 Rank 34/53

Kimi K3.1 Pro 73.5/100 Rank 13/53

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
| Category | Fledge Alpha | Kimi K3.1 Pro |
|---|---|---|
| Task & likeness | 8.0/10 | 8.5/10 |
| Anatomy & construction | 6.0/10 | 7.5/10 |
| Space & placement | 6.5/10 | 6.5/10 |
| Light & reflections | 4.5/10 | 6.5/10 |
| Purposeful detail | 5.5/10 | 7.5/10 |
| Artistry & character | 5.0/10 | 7.5/10 |
| Materials & effects | 5.5/10 | 6.5/10 |
| Visual integrity | 6.5/10 | 7.5/10 |
Benchmark task
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.