STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Gemini 4 Argon vs Kimi K3.1 Pro

Gemini 4 Argon leads Kimi K3.1 Pro by 10.7 points on StealthMark, 67.4 to 56.7. It leads on 8 of 9 benchmarks, including Latch, and Kimi K3.1 Pro on 1, including Foresight. Gemini 4 Argon scores higher on Newton's Mirror, with its largest category advantage in reflections.

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All results ↗
All results ↗

Overall StealthMark

67.4/100Overall rank 5/53
56.7/100Overall rank 11/53

General Intelligence

63.6/100
53.9/100

Visual Intelligence

74.4/100
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

  • Gemini 4 Argon
  • Kimi K3.1 Pro
  • Other models
  • Median

DATASHEET

Specs and pricing

Gemini 4 Argon scores higher on StealthMark and runs 23% faster in our speed test. Both take about 1M tokens of context.

  • Gemini 4 Argon
  • Kimi K3.1 Pro
  • Other models
  • Median
PricePer 1M output tokens, input below
Gemini 4 Argon: $10Tied$2 inputKimi K3.1 Pro: $10Tied$2 input
Context windowTokens per request, max output below
Gemini 4 Argon: 1MTied1M max outputKimi K3.1 Pro: 1MTied1M max output
Output speedTokens per second, our measurement
Gemini 4 Argon: 14423% fastertokens/sKimi K3.1 Pro: 117tokens/s
SizeTotal and active parameters
Gemini 4 Argon: Not disclosedKimi K3.1 Pro: 2.8T104B activeEstimated
Developer
GoogleMoonshot AI
Released
13 Oct 202623 Oct 2026
Origin
United StatesChina
Input → output
Text, image, audio, video, PDF → textText, image, video → text
Architecture
Sparse mixture-of-experts (MoE) transformer with native multimodal inputsPost-trained version of Kimi K3, a Mixture-of-Experts model

Full datasheets, every price and sourceGemini 4 Argon ↗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.

Gemini 4 Argon 48.6/100Rank 19/47

Survived 1 of 3
Foresight: complete playing field
Level 36 ptsTurn 7 / 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

LevelGemini 4 ArgonKimi K3.1 Pro
Level 1Second Thoughts
26 ptsSurvived
15 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
12 ptsOut of lives
Level 3Hide or Flight
6 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.

Gemini 4 Argon 82.6/100Rank 6/48

Cleared 5 of 5
Latch: complete playing field
Level 520.6 ptsTurn 27 / 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

LevelGemini 4 ArgonKimi K3.1 Pro
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9.8 ptsCleared
Level 3Relay vault
19.2 ptsCleared
19.2 ptsCleared
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20.6 ptsCleared
19.8 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Gemini 4 Argon

The central sphere, separate airborne black blob, flattened cyan contact and displaced crimson aftermath support the principal camera and physical-state requirements. Open lateral lanes and initial reflection placements provide partial optical structure, but missing outer chains, sparse nested imagery and incomplete emitter mappings remain substantial limitations. The raised crimson mass also weakens paint-scale fidelity.

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

CategoryGemini 4 ArgonKimi K3.1 Pro
State at 600 ms24.5/2523.5/25
Camera and placement14.5/1510.5/15
Reflections50.5/12026.0/120
Materials and scale8.5/107.0/10
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

Gemini 4 Argon

An appealing, controlled illustration with a distinctive buoyant silhouette, expressive comic face and rich luminous colour. The full composition and grounded slipper read clearly. The principal limitation is the crowded raised-foot interaction: paws, toes and lining overlap without making the bent leg or tight fit unmistakable.

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

CategoryGemini 4 ArgonKimi K3.1 Pro
Task & likeness7.0/108.0/10
Anatomy & construction6.5/105.5/10
Space & placement7.5/106.5/10
Light & reflections7.5/106.5/10
Purposeful detail8.0/107.5/10
Artistry & character7.0/107.0/10
Materials & effects7.0/107.0/10
Visual integrity7.5/107.0/10

Benchmark task

Gemini 4 Argon

A luminous little dragon struggles with its bedtime slippers while a buoyant tail pulls it upward. The scene tests expressive anatomy, physical contact and the contrast between translucent forms and heavy objects.

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

Same task instructions

Precise visual recall and portrait reconstruction.

The judgment

Gemini 4 Argon

A coherent, moderately complex Mona Lisa reconstruction with substantial portrait volume, articulated clothing and landscape recession. Specific source features support replication beyond recognition alone. Altered facial likeness, uncertain crossed-hand anatomy and pervasive colored crackle keep the result uneven despite its developed shading and 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

CategoryGemini 4 ArgonKimi K3.1 Pro
Task & likeness6.5/105.0/10
Anatomy & construction6.5/105.0/10
Space & placement6.5/105.5/10
Light & reflections7.0/106.0/10
Purposeful detail6.0/105.5/10
Artistry & character6.5/106.0/10
Materials & effects7.0/105.0/10
Visual integrity7.0/106.5/10

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

Gemini 4 Argon

A strong decorative beach illustration with controlled color, intricate silhouettes and abundant playful detail. Connected dolphin forms and recognizable equipment support its construction, while the aligned sunset reflection anchors the scene. Compressed wave depth, ambiguous foreground support and uneven reflection specificity limit physical coherence. The saved comparisons support retaining the category assessments.

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

CategoryGemini 4 ArgonKimi K3.1 Pro
Task & likeness9.0/108.5/10
Anatomy & construction7.5/105.5/10
Space & placement8.5/105.5/10
Light & reflections8.5/106.5/10
Purposeful detail9.0/106.5/10
Artistry & character8.0/105.5/10
Materials & effects8.0/106.5/10
Visual integrity8.0/107.5/10

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

Gemini 4 Argon

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

Gemini 4 Argon

An accomplished illustration with expressive characters, intricate spray and strong depth. Direct back seating, steering connections and hull-water contact are only partly demonstrated. Clean graphic execution and purposeful detail remain strengths, while shadows and reflections provide limited physical grounding.

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

CategoryGemini 4 ArgonKimi K3.1 Pro
Task & likeness8.5/107.0/10
Anatomy & construction8.0/105.5/10
Space & placement7.5/106.0/10
Light & reflections7.5/105.5/10
Purposeful detail8.5/107.0/10
Artistry & character8.5/106.0/10
Materials & effects8.0/106.0/10
Visual integrity8.0/107.0/10

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

Gemini 4 Argon

An expressive, detailed illustration with controlled gradients and coherent environmental depth. Continuous body contours and connected bicycle components establish competent construction. Steering grip and pedal engagement remain less explicit than the decorative details and wheel placement. These contact uncertainties limit action and placement credit without establishing broken anatomy.

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

CategoryGemini 4 ArgonKimi K3.1 Pro
Task & likeness9.0/108.5/10
Anatomy & construction8.5/107.5/10
Space & placement8.0/106.5/10
Light & reflections8.0/106.5/10
Purposeful detail8.5/107.5/10
Artistry & character8.5/107.5/10
Materials & effects8.5/106.5/10
Visual integrity8.5/107.5/10

Benchmark task

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