STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Claude Fable 5.1 vs DeepSeek V4.1 Flash 1017

Claude Fable 5.1 leads DeepSeek V4.1 Flash 1017 by 2.0 points on StealthMark, 61.5 to 59.5. DeepSeek V4.1 Flash 1017 leads on 5 of 9 benchmarks, including both games, and Claude Fable 5.1 on 4. Claude Fable 5.1 scores higher on Beach, with its largest category advantage in artistry & character.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

61.5/100Overall rank 8/50
59.5/100Overall rank 9/50

General Intelligence

58.3/100
56.9/100

Visual Intelligence

66.8/100
64.1/100

BENCHMARK BY BENCHMARK

Where each model leads

  • Claude Fable 5.1
  • DeepSeek V4.1 Flash 1017
  • Other models
  • Median

Planning and learning across maze levels. 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 5.134.2/100Rank 34/432 of 3 levels

2 of 3 levels played
Foresight: complete playing field
Level 38 ptsTurn 17 / 20

DeepSeek V4.1 Flash 101752.9/100Rank 13/43

Survived 1 of 3 levels
Foresight: complete playing field
Level 310 ptsTurn 15 / 20

Points per level

LevelClaude Fable 5.1DeepSeek V4.1 Flash 1017
Level 1Second Thoughts
21 ptsOut of lives
26 ptsSurvived
Level 2Pressure Pot
Pending
7 ptsOut of lives
Level 3Hide or Flight
8 ptsOut of lives
10 ptsOut of lives

Cooperative planning across puzzle levels. 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 5.180.2/100Rank 21/433 of 5 levels

3 of 5 levels played
Latch: complete playing field
Level 520.6 ptsTurn 27 / 40

DeepSeek V4.1 Flash 101773.9/100Rank 12/43

Cleared 5 of 5 levels
Latch: complete playing field
Level 520 ptsTurn 30 / 40

Points per level

LevelClaude Fable 5.1DeepSeek V4.1 Flash 1017
Level 1Hold the door
Pending
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9.8 ptsCleared
Level 3Relay vault
Pending
19.2 ptsCleared
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
16.4 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20.6 ptsCleared
20 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Claude Fable 5.1

The broad paint sequence, bilateral near-field sphere arrangement, overlaps and diminishing panel repetitions are recognizable; crimson is slightly too low. Small paint scale and basic shading provide material cues, although the steel response remains soft. Inaccurate light projections, missing outer chains and incomplete nested room imagery remain the principal limitations.

DeepSeek V4.1 Flash 1017

Principal sphere and airborne-black placements are supported, and diminishing bilateral chains provide limited optical structure. Missing nested imagery, incomplete outer chains, distorted first images and sparse emitter recurrence remain the dominant weaknesses. Oversized paint bodies and unresolved cyan contact impose separate limitations.

Score breakdown

CategoryClaude Fable 5.1DeepSeek V4.1 Flash 1017
State at 600 ms24.0/2523.0/25
Camera and placement14.0/1513.5/15
Reflections48.0/12034.0/120
Materials and scale7.0/109.0/10
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

Claude Fable 5.1

The coral palette, friendly face, matte shading and cream arch create a coherent emblem. However, the mantle is elongated rather than compact, and the appendages spread mostly sideways and downward instead of forming an evenly spaced, flower-like starburst. Two thin hanging appendages weaken the thick-arm motif. Clean contours and balanced framing support the simple design.

DeepSeek V4.1 Flash 1017

An expressive, intricately drawn storybook scene with a complete flowing silhouette and differentiated glossy materials. The supported main lens and continuous shrimp body make the central interaction readable, but reciprocal eye lines, facial magnification and the smaller lens grip remain ambiguous. Bright granular fringes and crowded accessory lines limit the finish.

Score breakdown

CategoryClaude Fable 5.1DeepSeek V4.1 Flash 1017
Task & likeness6.5/107.5/10
Anatomy & construction7.0/107.5/10
Space & placement7.5/108.0/10
Light & reflections6.5/107.0/10
Purposeful detail6.0/107.5/10
Artistry & character7.0/108.0/10
Materials & effects6.5/107.5/10
Visual integrity8.0/106.5/10

Benchmark task

Claude Fable 5.1

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

DeepSeek V4.1 Flash 1017

A whale and a tiny shrimp examine one another through bubble lenses, with an octopus nearby. The scene tests interacting characters, differences in scale and transparent materials.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Claude Fable 5.1

The dark clothing, crossed hands and hazy landscape establish the Mona Lisa composition. Replication is limited by the frontal, elongated face, wide eyes and simplified smile. Rounded, parallel fingers and unclear wrist transitions weaken the hands. Warm facial shading gives some volume, but broad garment shapes and scattered crack marks substitute for convincing folds and painterly detail.

DeepSeek V4.1 Flash 1017

A coherent graphic interpretation with controlled contours, modeled facial volume and purposeful portrait details. Replication remains limited by the frontal pose, enlarged face, altered expression and ambiguous crossed hands. Landscape layering provides depth, while schematic fabric, smooth surfaces and tonal bands constrain the finish.

Score breakdown

CategoryClaude Fable 5.1DeepSeek V4.1 Flash 1017
Task & likeness5.5/105.0/10
Anatomy & construction6.0/105.0/10
Space & placement6.0/106.0/10
Light & reflections6.0/106.0/10
Purposeful detail5.0/105.5/10
Artistry & character5.5/105.5/10
Materials & effects6.0/105.5/10
Visual integrity6.5/106.0/10

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 5.1

The colorful sunset, layered shoreline, animals, kite and beach toys fulfill the lively beach brief. Clean silhouettes and a balanced composition give the illustration character. Construction is simplified: the umbrella resembles a segmented fan, dolphins have weak water interaction, and the sun’s reflection forms a rigid widening wedge. Flat surfaces and sparse contact shadows limit depth.

DeepSeek V4.1 Flash 1017

A coherent, colorful beach illustration with controlled curves, clean layering and varied readable accessories. Castle details and small animal features strengthen its finish. Schematic airborne animals, uncertain board support, shallow architectural depth and decorative reflections limit physical coherence and drawing sophistication.

Score breakdown

CategoryClaude Fable 5.1DeepSeek V4.1 Flash 1017
Task & likeness8.5/107.0/10
Anatomy & construction7.0/105.5/10
Space & placement7.0/105.5/10
Light & reflections7.0/106.0/10
Purposeful detail7.5/106.5/10
Artistry & character7.5/105.0/10
Materials & effects6.5/105.5/10
Visual integrity7.5/105.5/10

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

Claude Fable 5.1

This benchmark has not been assessed yet.

DeepSeek V4.1 Flash 1017

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

Claude Fable 5.1

The raccoon rides on the dog's back, and the dog's extended foreleg reaches the jet ski controls. Expressive faces, a clear silhouette and sweeping spray make the action readable. Limb and handlebar overlaps weaken construction; broad shading provides limited volume, and the glowing sun has little corresponding reflection on the water. Clean vector shapes support an appealing but simplified illustration.

DeepSeek V4.1 Flash 1017

An appealing cartoon with recognizable riders, expressive faces and a cohesive twilight palette. Clean shapes support the composition, but ambiguous limb overlaps, weak seat contact and loosely resolved steering limit physical coherence. Lighting and water effects are decorative, with modest material differentiation and drawing complexity.

Score breakdown

CategoryClaude Fable 5.1DeepSeek V4.1 Flash 1017
Task & likeness8.5/108.0/10
Anatomy & construction6.5/107.0/10
Space & placement7.0/107.0/10
Light & reflections5.5/106.5/10
Purposeful detail7.0/107.0/10
Artistry & character7.5/107.0/10
Materials & effects6.5/106.5/10
Visual integrity7.5/108.0/10

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 5.1

The pelican reads clearly, with an expressive face, prominent bill and appealing composition. Both legs connect to the body, but the far foot's pedal contact and the wing's steering grip remain unclear. Wheel alignment and background layers are coherent. Clean contours and feather lines give polish, while schematic machinery, limited surface texture and weak directional lighting constrain the finish.

DeepSeek V4.1 Flash 1017

An expressive, controlled illustration with continuous body construction, substantial bicycle detail and effective landscape depth. Unclear foot-to-pedal and wing-to-handlebar contacts limit physical conviction and local readability. Purposeful detail and composition are stronger than directional lighting and material treatment.

Score breakdown

CategoryClaude Fable 5.1DeepSeek V4.1 Flash 1017
Task & likeness8.5/108.5/10
Anatomy & construction7.0/107.0/10
Space & placement7.5/107.5/10
Light & reflections6.0/106.5/10
Purposeful detail7.0/107.5/10
Artistry & character7.5/107.0/10
Materials & effects6.0/107.0/10
Visual integrity8.0/107.5/10

Benchmark task

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