Claude Opus 5.5 66.3/100Rank 5/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Claude Opus 5.5 leads MiMo-V2.6-Pro by 24.7 points on StealthMark, 72.6 to 47.9. 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 and runs 43% faster in our speed test. MiMo-V2.6-Pro is 23× cheaper per output token. Both take about 1M tokens of context.
Full datasheets, every price and sourceClaude Opus 5.5 ↗MiMo-V2.6-Pro ↗
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.
MiMo-V2.6-Pro
The main framing and visible paint-contact story are well supported. Major optical omissions dominate the result: sparse repetitions, undersized first images, missing outer chains and absent curved nested imagery prevent a coherent mirror-room system. The metallic forms remain convincing in volume but have a soft illustrative finish.
| Category | Claude Opus 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| State at 600 ms | 24.0/25 | 23.0/25 |
| Camera and placement | 15.0/15 | 12.0/15 |
| Reflections | 55.0/120 | 19.0/120 |
| 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.
MiMo-V2.6-Pro
An appealing rabbit with balanced framing, expressive eyes and purposeful costume accents. Simple frontal construction limits anatomical and spatial accomplishment. The orange orb provides an effective luminous focal point, but unreadable wrist connections weaken the requested gestures and prevent stronger integrity credit.
| Category | Claude Opus 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| Task & likeness | 8.0/10 | 6.5/10 |
| Anatomy & construction | 7.5/10 | 5.0/10 |
| Space & placement | 8.0/10 | 5.5/10 |
| Light & reflections | 7.5/10 | 6.5/10 |
| Purposeful detail | 7.0/10 | 6.5/10 |
| Artistry & character | 7.0/10 | 5.0/10 |
| Materials & effects | 7.0/10 | 6.5/10 |
| Visual integrity | 8.5/10 | 6.0/10 |
Claude Opus 5.5
A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.
MiMo-V2.6-Pro
A small rabbit in an explorer outfit floats with a luminous orb. The scene tests character anatomy, pose and the placement of geometric forms around it.
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.
MiMo-V2.6-Pro
The portrait is recognizable through its dark silhouette, slight smile and muted landscape, but replication is weak. A frontal, oversized head and symmetric torso replace the reference's turned seated pose; angular, separated hands omit its central gesture. Smooth shading maintains coherence while anatomical detail, depth and material rendering remain basic.
| Category | Claude Opus 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| Task & likeness | 6.5/10 | 3.5/10 |
| Anatomy & construction | 5.5/10 | 3.5/10 |
| Space & placement | 6.5/10 | 4.0/10 |
| Light & reflections | 6.5/10 | 5.0/10 |
| Purposeful detail | 6.5/10 | 3.0/10 |
| Artistry & character | 6.0/10 | 4.0/10 |
| Materials & effects | 7.0/10 | 4.0/10 |
| Visual integrity | 7.0/10 | 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 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.
MiMo-V2.6-Pro
A readable sunset beach with clear requested subjects, appealing framing and purposeful accessories. Schematic anatomy, flattened foreground objects, repetitive water highlights and sparse directional shadows limit construction and physical depth. The kite's unresolved anchor also constrains integrity.
| Category | Claude Opus 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| Task & likeness | 8.5/10 | 8.5/10 |
| Anatomy & construction | 7.5/10 | 5.0/10 |
| Space & placement | 7.0/10 | 6.0/10 |
| Light & reflections | 7.5/10 | 6.5/10 |
| Purposeful detail | 7.5/10 | 6.5/10 |
| Artistry & character | 8.0/10 | 5.0/10 |
| Materials & effects | 6.5/10 | 6.0/10 |
| Visual integrity | 8.0/10 | 6.0/10 |
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.
MiMo-V2.6-Pro
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.
MiMo-V2.6-Pro
A coherent, cheerful cartoon with recognizable animals, readable steering contact and useful small details. The dog's orientation follows the craft more successfully than a wholly frontal pose would. Simple anatomy, weak raccoon grip and compressed seating contacts still limit physical credibility. Gradients and spray provide polish without resolving complex construction.
| Category | Claude Opus 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| Task & likeness | 8.5/10 | 7.0/10 |
| Anatomy & construction | 7.5/10 | 5.0/10 |
| Space & placement | 7.5/10 | 5.5/10 |
| Light & reflections | 6.0/10 | 5.5/10 |
| Purposeful detail | 8.5/10 | 6.0/10 |
| Artistry & character | 7.0/10 | 4.0/10 |
| Materials & effects | 7.0/10 | 5.5/10 |
| Visual integrity | 8.0/10 | 4.5/10 |
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.
MiMo-V2.6-Pro
The distinctive bill, continuous silhouette and detailed wheels establish a readable pelican cyclist. Shaped feathers and soft shading add character, but jointless legs, crowded pedal contacts, absent steering contact and loosely directional lighting limit the construction. The comparisons support retaining the baseline category scores.
| Category | Claude Opus 5.5 | MiMo-V2.6-Pro |
|---|---|---|
| Task & likeness | 8.5/10 | 6.5/10 |
| Anatomy & construction | 8.0/10 | 5.0/10 |
| Space & placement | 7.0/10 | 6.0/10 |
| Light & reflections | 6.0/10 | 5.5/10 |
| Purposeful detail | 8.0/10 | 6.0/10 |
| Artistry & character | 7.5/10 | 6.0/10 |
| Materials & effects | 6.0/10 | 5.5/10 |
| Visual integrity | 8.5/10 | 6.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.