Claude Opus 5.5 66.3/100Rank 5/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Claude Opus 5.5 leads Muse Wonder by 15.6 points on StealthMark, 72.6 to 57.0. It leads on all 9 benchmarks. Claude Opus 5.5 scores higher on Newton's Mirror, with its largest category advantage in reflections.
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 Opus 5.5 scores higher on StealthMark. Muse Wonder runs 3.4× faster in our speed test. Both take about 1M tokens of context.
Full datasheets, every price and sourceClaude Opus 5.5 ↗Muse Wonder ↗
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 Opus 5.5
Open lateral sightlines, first reflected silhouettes and near-field planar panel placement are convincing. Missing outer chains, truncated repetitions and absent nested spherical room and emitter imagery remain the main weaknesses.
Muse Wonder
The flattened cyan cap, separate airborne black blob and crimson droplets support much of the contact sequence, although crimson adhesion and forward carriage remain unresolved. Main-sphere placement is broadly compatible with the prescribed view. Sparse isolated mirror images replace the defining repeated room structure and curved nested reflections. The crimson mass is visibly oversized, and the top-center lamp image is missing.
| Category | Claude Opus 5.5 | Muse Wonder |
|---|---|---|
| State at 600 ms | 24.0/25 | 22.0/25 |
| Camera and placement | 15.0/15 | 12.0/15 |
| Reflections | 55.0/120 | 21.5/120 |
| Materials and scale | 9.0/10 | 7.5/10 |
| 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 Opus 5.5
The centered coral squid has a friendly, restrained expression and a balanced radial silhouette within a cream arch. Smooth curves and soft shading give it an appealing matte finish. The mantle is more elongated than compact, the upper arms are visually ambiguous, and the two hanging tentacles read somewhat like legs. Clean execution supports a strong stylized illustration.
Muse Wonder
An appealing, coherent cartoon with a readable effortful expression and clear forefeet gripping the trunk. Soft colours and controlled contours support its tenderness. Smooth ears, stiff foreleg construction, limited surface texture and uncertain seed contact keep the execution below intricate illustration quality.
| Category | Claude Opus 5.5 | Muse Wonder |
|---|---|---|
| Task & likeness | 8.0/10 | 7.5/10 |
| Anatomy & construction | 7.5/10 | 7.0/10 |
| Space & placement | 8.0/10 | 7.5/10 |
| Light & reflections | 7.5/10 | 7.0/10 |
| Purposeful detail | 7.0/10 | 7.5/10 |
| Artistry & character | 7.0/10 | 6.5/10 |
| Materials & effects | 7.0/10 | 6.5/10 |
| Visual integrity | 8.5/10 | 8.0/10 |
Claude Opus 5.5
A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.
Muse Wonder
A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.
Precise visual recall and portrait reconstruction.


Claude Opus 5.5
The portrait preserves the recognizable composition, dark veil, folded hands and distant landscape. Replication is limited by the elongated face and neck, conspicuous eyes and simplified smile. Hands remain connected but their rounded fingers and wrists lack convincing anatomy. Restrained colors create cohesion; shallow modeling and pervasive mottling weaken volume and painterly subtlety.
Muse Wonder
A competent illustrative interpretation with controlled curves, readable details and coherent depth layers. Facial, hair and garment shading demonstrate more development than basic construction. Replication remains limited by the frontal pose, elongated face and pronounced smile; crowded fingers, weak contact shadows and smooth materials constrain anatomical and painterly conviction.
| Category | Claude Opus 5.5 | Muse Wonder |
|---|---|---|
| Task & likeness | 6.5/10 | 5.5/10 |
| Anatomy & construction | 5.5/10 | 5.5/10 |
| Space & placement | 6.5/10 | 5.5/10 |
| Light & reflections | 6.5/10 | 5.5/10 |
| Purposeful detail | 6.5/10 | 5.5/10 |
| Artistry & character | 6.0/10 | 5.5/10 |
| Materials & effects | 7.0/10 | 5.0/10 |
| Visual integrity | 7.0/10 | 6.5/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Claude Opus 5.5
A lively, well-composed beach illustration with rich sunset colors, recognizable animals and appealing accessories. The sun reflection establishes a strong central focus. Clean silhouettes and small details reward inspection, though simplified animal construction, uneven contact shadows and mostly flat materials limit depth and realism.
Muse Wonder
A lively beach illustration with expressive animals, controlled colour transitions and unusually readable accessories. Connected graphic forms make the activities recognizable. Crowded overlaps, compressed depth, schematic joints, weak directional shadows and limited material variation constrain its physical coherence and refinement.
| Category | Claude Opus 5.5 | Muse Wonder |
|---|---|---|
| Task & likeness | 8.5/10 | 8.5/10 |
| Anatomy & construction | 7.5/10 | 6.0/10 |
| Space & placement | 7.0/10 | 6.5/10 |
| Light & reflections | 7.5/10 | 6.5/10 |
| Purposeful detail | 7.5/10 | 9.0/10 |
| Artistry & character | 8.0/10 | 7.0/10 |
| Materials & effects | 6.5/10 | 6.0/10 |
| Visual integrity | 8.0/10 | 7.0/10 |
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 Opus 5.5
This benchmark has not been assessed yet.
Muse Wonder
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 Opus 5.5
The masked raccoon clearly rides the dog's back, and the dog's forward paw reaches the steering grip. Expressive faces, vivid colors and sweeping wakes create an appealing illustration. Connected limbs remain schematic, as does the small steering assembly. The broad hull and flat foam weaken water contact; the glowing sun lacks a corresponding reflection or convincing cast shadows.
Muse Wonder
An expressive, coherent cartoon demonstrates the requested riding and steering interaction. Clean contours, differentiated accessories and energetic spray support its appeal. Concealed seated contacts, compressed vehicle perspective and weak directional lighting limit physical resolution despite the detailed presentation.
| Category | Claude Opus 5.5 | Muse Wonder |
|---|---|---|
| Task & likeness | 8.5/10 | 7.5/10 |
| Anatomy & construction | 7.5/10 | 5.5/10 |
| Space & placement | 7.5/10 | 6.5/10 |
| Light & reflections | 6.0/10 | 4.5/10 |
| Purposeful detail | 8.5/10 | 7.5/10 |
| Artistry & character | 7.0/10 | 5.5/10 |
| Materials & effects | 7.0/10 | 7.0/10 |
| Visual integrity | 8.0/10 | 7.0/10 |
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 Opus 5.5
The recognizable pelican, orderly bicycle wheels and harmonious sunset create an appealing illustration. Both legs connect to the body and reach pedals; no clear detached or inverted parts appear. Steering contact and seating support are less convincing, while the drivetrain remains schematic. Crisp outlines give a clean finish, but limited shading and flat surfaces leave the scene with modest depth.
Muse Wonder
A controlled, expressive seaside illustration with a distinctive pelican, coherent bicycle geometry and successfully resolved graphic detail. Visible pedal support and plausible occlusion strengthen the riding construction. Aligned wheels and layered scenery establish placement. Limited cast shadows, simplified leg articulation and restrained material modeling constrain its physical finish.
| Category | Claude Opus 5.5 | Muse Wonder |
|---|---|---|
| Task & likeness | 8.5/10 | 8.5/10 |
| Anatomy & construction | 8.0/10 | 6.0/10 |
| Space & placement | 7.0/10 | 7.5/10 |
| Light & reflections | 6.0/10 | 5.5/10 |
| Purposeful detail | 8.0/10 | 8.5/10 |
| Artistry & character | 7.5/10 | 7.5/10 |
| Materials & effects | 6.0/10 | 6.0/10 |
| Visual integrity | 8.5/10 | 8.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.