Claude Opus 5.5 66.3/100Rank 5/49

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Claude Opus 5.5 leads Inkling-Small by 45.0 points on StealthMark, 72.6 to 27.6. 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
Both take about 1M tokens of context.
Full datasheets, every price and sourceClaude Opus 5.5 ↗Inkling-Small ↗
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.
Inkling-Small
The sphere's apparent floor support, separate dark feature and broad paint ordering justify partial state credit. The major weakness is the largely missing mirror system: isolated side images and faint floor echoes do not establish repeated virtual rooms or curved spherical mapping. Downward framing, the oversized frontal panel, unresolved paint transport and satin surface appearance remain distinct limitations.
| Category | Claude Opus 5.5 | Inkling-Small |
|---|---|---|
| State at 600 ms | 24.0/25 | 14.0/25 |
| Camera and placement | 15.0/15 | 3.0/15 |
| Reflections | 55.0/120 | 8.0/120 |
| Materials and scale | 9.0/10 | 2.5/10 |
| 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.
Inkling-Small
The faces and dripping caps communicate a cute mushroom scene, but simple construction and weak spatial relationships limit the result. The defining foot-stamping action is unresolved, the flattering portrait is smaller than its painter, and the requested material contrasts are only partly conveyed.
| Category | Claude Opus 5.5 | Inkling-Small |
|---|---|---|
| Task & likeness | 8.0/10 | 2.5/10 |
| Anatomy & construction | 7.5/10 | 1.5/10 |
| Space & placement | 8.0/10 | 3.5/10 |
| Light & reflections | 7.5/10 | 3.0/10 |
| Purposeful detail | 7.0/10 | 4.5/10 |
| Artistry & character | 7.0/10 | 3.0/10 |
| Materials & effects | 7.0/10 | 3.5/10 |
| Visual integrity | 8.5/10 | 2.0/10 |
Claude Opus 5.5
A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.
Inkling-Small
Character scenes test expression, anatomy, materials and coherent visual construction.
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.
Inkling-Small
A recognizable but rudimentary Mona Lisa interpretation. Facial shading and subdued colors provide coherence, while the frontal blocklike torso, unresolved wrists, fingerless hands and shallow landscape substantially limit likeness, construction and finish.
| Category | Claude Opus 5.5 | Inkling-Small |
|---|---|---|
| Task & likeness | 6.5/10 | 2.5/10 |
| Anatomy & construction | 5.5/10 | 2.5/10 |
| Space & placement | 6.5/10 | 3.0/10 |
| Light & reflections | 6.5/10 | 2.5/10 |
| Purposeful detail | 6.5/10 | 2.0/10 |
| Artistry & character | 6.0/10 | 2.5/10 |
| Materials & effects | 7.0/10 | 2.0/10 |
| Visual integrity | 7.0/10 | 3.0/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Claude 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.
Inkling-Small
A recognizable sunset beach with a clear focal sun and appealing color transitions. Connected fish silhouettes and layered scenery establish basic coherence. Primitive figures, ambiguous recreation, sparse descriptive detail and weak grounding limit construction and depth. The aligned reflection supplies a useful lighting cue, but shadows and material effects remain underdeveloped.
| Category | Claude Opus 5.5 | Inkling-Small |
|---|---|---|
| Task & likeness | 8.5/10 | 3.5/10 |
| Anatomy & construction | 7.5/10 | 3.0/10 |
| Space & placement | 7.0/10 | 3.0/10 |
| Light & reflections | 7.5/10 | 3.0/10 |
| Purposeful detail | 7.5/10 | 3.0/10 |
| Artistry & character | 8.0/10 | 3.0/10 |
| Materials & effects | 6.5/10 | 2.5/10 |
| Visual integrity | 8.0/10 | 2.0/10 |
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.
Inkling-Small
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.
Inkling-Small
Recognizable animals, readable accessories and an appealing sunset support a coherent basic cartoon. Rounded construction leaves joints, riding support and steering unresolved. Decorative gradients contribute atmosphere, but directional lighting, distinct materials and convincing water displacement are weakly demonstrated.
| Category | Claude Opus 5.5 | Inkling-Small |
|---|---|---|
| Task & likeness | 8.5/10 | 4.0/10 |
| Anatomy & construction | 7.5/10 | 3.0/10 |
| Space & placement | 7.5/10 | 4.0/10 |
| Light & reflections | 6.0/10 | 5.0/10 |
| Purposeful detail | 8.5/10 | 5.5/10 |
| Artistry & character | 7.0/10 | 4.0/10 |
| Materials & effects | 7.0/10 | 5.0/10 |
| Visual integrity | 8.0/10 | 5.0/10 |
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.
Inkling-Small
The pelican is immediately recognizable, and its sweeping neck, shaped bill and orderly spokes provide character. Riding remains only partially realized: legs, pedal engagement, steering and seat support cannot be read confidently. Controlled graphic effects add atmosphere, but simplified construction and weak grounding keep the result basic.
| Category | Claude Opus 5.5 | Inkling-Small |
|---|---|---|
| Task & likeness | 8.5/10 | 4.0/10 |
| Anatomy & construction | 8.0/10 | 3.0/10 |
| Space & placement | 7.0/10 | 3.0/10 |
| Light & reflections | 6.0/10 | 3.0/10 |
| Purposeful detail | 8.0/10 | 4.5/10 |
| Artistry & character | 7.5/10 | 5.0/10 |
| Materials & effects | 6.0/10 | 4.5/10 |
| Visual integrity | 8.5/10 | 3.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.