Claude Sonnet 5.5 59.6/100Rank 11/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Claude Sonnet 5.5 leads DeepSeek-V4.1-Flash-1017 by 11.0 points on StealthMark, 70.2 to 59.2. It leads on all 9 benchmarks. Claude Sonnet 5.5 scores higher on Beach, with its largest category advantage in artistry & character.
See the difference ↘On every task, result quality and reasoning tokens are each compared with all measured models and weighed equally. Each dot is one model.
BENCHMARK BY BENCHMARK
DATASHEET
Claude Sonnet 5.5 scores higher on StealthMark. DeepSeek-V4.1-Flash-1017 is 8.3× cheaper per output token and runs 25% faster in our speed test. Both take about 1M tokens of context.
Full datasheets, every price and sourceClaude Sonnet 5.5 ↗DeepSeek-V4.1-Flash-1017 ↗
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.


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.


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


Claude Sonnet 5.5
The near-field silhouettes, broad perspective and paint contact order are recognizable. Missing outer chains, truncated repetitions and absent ordered imagery within the main and reflected spheres substantially limit the reflection system. Sparse spherical highlights leave much of the curved room and emitter mapping unsupported, despite some plausible planar light sequences.
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.
| Category | Claude Sonnet 5.5 | DeepSeek-V4.1-Flash-1017 |
|---|---|---|
| State at 600 ms | 24.0/25 | 23.0/25 |
| Camera and placement | 15.0/15 | 13.5/15 |
| Reflections | 35.0/120 | 34.0/120 |
| Materials and scale | 10.0/10 | 8.5/10 |
| Floor-damage reward | 0.0/10 | 0.0/10 |
A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.
Visual construction and creative interpretation.


Claude Sonnet 5.5
The centered coral squid has a friendly, composed expression and a balanced flower-like silhouette. Eight thick arms and two slender tentacles remain visibly connected, with no inverted parts. The mantle is elongated rather than compact, and the arm spacing is uneven. Soft shading gives volume, but dense stippling weakens the requested smooth matte finish; the broad background halo makes depth less precise.
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.
| Category | Claude Sonnet 5.5 | DeepSeek-V4.1-Flash-1017 |
|---|---|---|
| Task & likeness | 8.0/10 | 7.5/10 |
| Anatomy & construction | 8.0/10 | 7.5/10 |
| Space & placement | 8.0/10 | 8.0/10 |
| Light & reflections | 7.5/10 | 7.0/10 |
| Purposeful detail | 8.0/10 | 7.5/10 |
| Artistry & character | 8.0/10 | 8.0/10 |
| Materials & effects | 8.0/10 | 7.5/10 |
| Visual integrity | 8.5/10 | 6.5/10 |
Claude Sonnet 5.5
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.
Precise visual recall and portrait reconstruction.


Claude Sonnet 5.5
The crossed hands, dark dress, restrained smile and winding landscape clearly recall the Mona Lisa. Replication is limited by the frontal symmetry, wide eyes, elongated neck and flattened fingers. Soft facial shading provides volume, but heavy darkness and pervasive crackle obscure forms. The composition is coherent; the landscape and fabric remain visibly schematic.
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.
| Category | Claude Sonnet 5.5 | DeepSeek-V4.1-Flash-1017 |
|---|---|---|
| Task & likeness | 6.5/10 | 5.0/10 |
| Anatomy & construction | 5.0/10 | 5.0/10 |
| Space & placement | 6.0/10 | 6.0/10 |
| Light & reflections | 6.5/10 | 6.0/10 |
| Purposeful detail | 6.0/10 | 5.5/10 |
| Artistry & character | 6.5/10 | 5.5/10 |
| Materials & effects | 6.0/10 | 5.5/10 |
| Visual integrity | 6.5/10 | 6.0/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Claude Sonnet 5.5
A richly designed beach illustration combines radiant sunset bands, intricate palm fans and playful silhouettes within a cohesive purple, coral and turquoise palette. Carefully varied accessories reward close inspection, while overlapping foreground forms and shoreline layers organize the abundant activity. Dense palm strokes compete with focal subjects; animal anatomy, relative scales and reflected silhouettes remain simplified.
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.
| Category | Claude Sonnet 5.5 | DeepSeek-V4.1-Flash-1017 |
|---|---|---|
| Task & likeness | 9.0/10 | 7.0/10 |
| Anatomy & construction | 8.0/10 | 5.5/10 |
| Space & placement | 8.5/10 | 5.5/10 |
| Light & reflections | 8.5/10 | 6.0/10 |
| Purposeful detail | 9.5/10 | 6.5/10 |
| Artistry & character | 9.5/10 | 5.0/10 |
| Materials & effects | 8.5/10 | 5.5/10 |
| Visual integrity | 8.0/10 | 4.5/10 |
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Physical reasoning, light and visual reconstruction.


Claude Sonnet 5.5
This benchmark has not been assessed yet.
DeepSeek-V4.1-Flash-1017
This benchmark has not been assessed yet.
A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.
Scene composition and interacting subjects.


Claude Sonnet 5.5
The raccoon clearly rides on the dog's back while the dog grips the jet ski controls. Expressive faces, vivid colors and a sweeping wake make the scene appealing. Visible limbs connect coherently, but overlapping steering paws and an indistinct control mounting weaken construction. Flat character lighting and simplified water limit depth and material realism.
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.
| Category | Claude Sonnet 5.5 | DeepSeek-V4.1-Flash-1017 |
|---|---|---|
| Task & likeness | 8.5/10 | 8.0/10 |
| Anatomy & construction | 7.0/10 | 7.0/10 |
| Space & placement | 8.0/10 | 7.0/10 |
| Light & reflections | 6.5/10 | 6.5/10 |
| Purposeful detail | 8.0/10 | 7.0/10 |
| Artistry & character | 7.0/10 | 7.0/10 |
| Materials & effects | 7.5/10 | 6.5/10 |
| Visual integrity | 8.0/10 | 8.0/10 |
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.
Subject construction and spatial relationships.


Claude Sonnet 5.5
The pelican is immediately recognizable, with an expressive face, generous bill and appealing cycling pose. Spokes, chain, feathers and scarf provide purposeful detail. The bicycle largely holds together, though overlapping angular legs obscure the far foot’s pedal contact. Clean outlines and balanced composition succeed; flat surfaces and limited directional lighting constrain depth.
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.
| Category | Claude Sonnet 5.5 | DeepSeek-V4.1-Flash-1017 |
|---|---|---|
| Task & likeness | 9.0/10 | 8.5/10 |
| Anatomy & construction | 7.5/10 | 7.0/10 |
| Space & placement | 7.5/10 | 7.5/10 |
| Light & reflections | 6.5/10 | 6.5/10 |
| Purposeful detail | 8.0/10 | 7.5/10 |
| Artistry & character | 7.5/10 | 7.0/10 |
| Materials & effects | 6.5/10 | 7.0/10 |
| Visual integrity | 8.0/10 | 7.5/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.