STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Claude Fable 5.2 vs Gemini 4 Argon

Claude Fable 5.2 leads Gemini 4 Argon by 12.4 points on StealthMark, 79.8 to 67.4. It leads on 5 of 9 benchmarks, including both games, and Gemini 4 Argon on 4. Claude Fable 5.2 scores higher on Newton's Mirror, with its largest category advantage in reflections.

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All results ↗
All results ↗

Overall StealthMark

79.8/100Overall rank 1/57
67.4/100Overall rank 6/57

General Intelligence

81.7/100
63.6/100

Visual Intelligence

76.0/100
74.4/100

Reasoning efficiency

How many reasoning tokens a model needs for the quality it delivers.

Single-step reasoning How much it reasons to understand a task

Multi-step reasoning How much it keeps reasoning as a task goes on

Cost efficiency

How much Performance you get for your money.

  • Claude Fable 5.2Not measured

BENCHMARK BY BENCHMARK

Where each model leads

  • Claude Fable 5.2
  • Gemini 4 Argon
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Claude Fable 5.2
  • Gemini 4 Argon
  • Other models
  • Median
PricePer 1M output tokens, input below
Claude Fable 5.2: No list priceGemini 4 Argon: $10$2 input
Context windowTokens per request, max output below
Claude Fable 5.2: Not publishedGemini 4 Argon: 1M1M max output
Output speedTokens per second, our measurement
Claude Fable 5.2: Not measuredGemini 4 Argon: 144tokens/s
Developer
Not publishedGoogle
Released
Not published13 Oct 2026
Origin
Not publishedUnited States
Input → output
Not publishedText, image, audio, video, PDF → text
Architecture
Not publishedSparse mixture-of-experts (MoE) transformer with native multimodal inputs

Full datasheets, every price and sourceGemini 4 Argon ↗

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.

Claude Fable 5.2 77.2/100Rank 2/53

Survived 3 of 3
Foresight: complete playing field
Level 318 ptsTurn 20 / 20

Gemini 4 Argon 48.6/100Rank 21/53

Survived 1 of 3
Foresight: complete playing field
Level 36 ptsTurn 7 / 20

Points per level

LevelClaude Fable 5.2Gemini 4 Argon
Level 1Second Thoughts
27 ptsSurvived
26 ptsSurvived
Level 2Pressure Pot
12 ptsSurvived
9 ptsOut of lives
Level 3Hide or Flight
18 ptsSurvived
6 ptsOut of lives

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.

Claude Fable 5.2 100.0/100Rank 1/54

Cleared 5 of 5
Latch: complete playing field
Level 520.8 ptsTurn 26 / 40

Gemini 4 Argon 82.6/100Rank 7/54

Cleared 5 of 5
Latch: complete playing field
Level 520.6 ptsTurn 27 / 40

Points per level

LevelClaude Fable 5.2Gemini 4 Argon
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
10.2 ptsClearedFinished early · 1 beacon left
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
20.8 ptsCleared
20.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Claude Fable 5.2

The composition closely preserves the principal camera relationships. Visible cyan contact, elongated crimson coating and separate airborne black paint support the required interaction sequence, with a small crimson transport overshoot. Correct broad mirror placement coexists with major omissions in nested spherical imagery and simplified emitter mapping. Core score: 105.5/170; floor-damage reward: 0/10; combined total: 105.5/180.

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.

Score breakdown

CategoryClaude Fable 5.2Gemini 4 Argon
State at 600 ms24.0/2524.5/25
Camera and placement15.0/1514.5/15
Reflections80.0/12050.5/120
Materials and scale8.5/108.5/10
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

Claude Fable 5.2

The compact mantle, eight curling rays and quiet face closely realize the requested living emblem. Controlled arm contours, coherent overlaps and restrained ornament give the design character. Shallow depth, ribbon-like arm modeling and repeated highlight bands limit anatomical and lighting complexity without compromising the intact silhouette.

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.

Score breakdown

CategoryClaude Fable 5.2Gemini 4 Argon
Task & likeness9.0/107.0/10
Anatomy & construction7.5/106.5/10
Space & placement7.0/107.5/10
Light & reflections7.0/107.5/10
Purposeful detail6.5/108.0/10
Artistry & character6.5/107.0/10
Materials & effects7.0/107.0/10
Visual integrity8.5/107.5/10

Benchmark task

Claude Fable 5.2

A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.

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.

Mona Lisa

Same task instructions

Precise visual recall and portrait reconstruction.

The judgment

Claude Fable 5.2

A developed illustrative portrait with controlled facial shading, connected limbs, layered scenery and distinct aged-paint and gold effects. Its frontal torso, conspicuous smile and flattened fingers limit replication and anatomical precision. Decorative finish is stronger than the underlying seated construction.

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.

Score breakdown

CategoryClaude Fable 5.2Gemini 4 Argon
Task & likeness6.5/106.5/10
Anatomy & construction6.0/106.5/10
Space & placement6.0/106.5/10
Light & reflections6.5/107.0/10
Purposeful detail6.0/106.0/10
Artistry & character6.5/106.5/10
Materials & effects7.5/107.0/10
Visual integrity7.5/107.0/10

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

Claude Fable 5.2

A lively sunset beach with clear playful activity, purposeful small details and developed water reflections. Layering and supported placements hold the scene together. Schematic anatomy and the turtle's overhead viewpoint limit construction, space and artistry, while atmospheric and surface effects show greater refinement.

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.

Score breakdown

CategoryClaude Fable 5.2Gemini 4 Argon
Task & likeness9.0/109.0/10
Anatomy & construction8.0/107.5/10
Space & placement7.5/108.5/10
Light & reflections8.5/108.5/10
Purposeful detail8.5/109.0/10
Artistry & character8.0/108.0/10
Materials & effects7.5/108.0/10
Visual integrity8.0/108.0/10

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

Claude Fable 5.2

This benchmark has not been assessed yet.

Gemini 4 Argon

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

Claude Fable 5.2

A controlled action illustration with expressive animals, demonstrated riding and steering, and an energetic layered wake. Purposeful small features and articulated poses strengthen the drawing. Simplified extremities, shallow character volume and limited physical lighting remain its principal constraints.

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.

Score breakdown

CategoryClaude Fable 5.2Gemini 4 Argon
Task & likeness8.5/108.5/10
Anatomy & construction8.0/108.0/10
Space & placement7.5/107.5/10
Light & reflections7.0/107.5/10
Purposeful detail8.5/108.5/10
Artistry & character8.0/108.5/10
Materials & effects7.5/108.0/10
Visual integrity8.0/108.0/10

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

Claude Fable 5.2

A strong illustration with an expressive pelican, readable riding contacts and carefully constructed bicycle details. Layered plumage, basket weave and coastal scenery reward inspection. Continuous attachments support the action, while limited visible leg articulation, modest volume and weakly directional foreground lighting constrain physical sophistication.

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.

Score breakdown

CategoryClaude Fable 5.2Gemini 4 Argon
Task & likeness9.0/109.0/10
Anatomy & construction8.0/108.5/10
Space & placement7.5/108.0/10
Light & reflections6.5/108.0/10
Purposeful detail8.0/108.5/10
Artistry & character7.5/108.5/10
Materials & effects7.0/108.5/10
Visual integrity8.0/108.5/10

Benchmark task

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