Hy4 preview 53.1/100Rank 14/49

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Hy4 preview leads Step 5 Preview by 4.9 points on StealthMark, 43.9 to 39.0. It leads on 7 of 9 benchmarks, including Foresight, and Step 5 Preview on 2, including Latch. Hy4 preview scores higher on Beach, with its largest category advantage in prompt & likeness.
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 sourceHy4 preview ↗Step 5 Preview ↗
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 ↗


Hy4 preview
The central sphere, compact airborne black bead and broad paint ordering are supported. Contact and transport history remain partly unresolved. The optical system provides only isolated first images and light patches, with little evidence of the extensive ordered reflection structure. Rounded metal and paint gloss are more successful than the reflected contents.
Step 5 Preview
The main sphere, airborne black and small colored features occupy broadly appropriate positions. Most of the defining mirror system is absent, and paint interaction remains only partially supported. The small paint features do not visibly establish a separate volume-scale violation.
| Category | Hy4 preview | Step 5 Preview |
|---|---|---|
| State at 600 ms | 18.0/25 | 20.0/25 |
| Camera and placement | 11.5/15 | 13.5/15 |
| Reflections | 29.5/120 | 20.0/120 |
| Materials and scale | 7.5/10 | 7.0/10 |
| 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.


Hy4 preview
A cohesive, appealing illustration with a serene face, luminous palette and complete framing. The separated head and torso weaken anatomical coherence, while crowded wing attachments and angular sash folds limit the requested suppleness. Clean execution and decorative detail exceed the clarity of the underlying construction.
Step 5 Preview
A charming diagonal climber and warm palette communicate the central idea. Simple rounded construction, crowded limb counting, uncertain footholds and an unattached upper shelf limit its physical coherence. Growth bands and the yarn trail add specificity, but the requested material distinctions and unravelled bootie remain underdeveloped.
| Category | Hy4 preview | Step 5 Preview |
|---|---|---|
| Task & likeness | 6.0/10 | 6.0/10 |
| Anatomy & construction | 5.5/10 | 4.5/10 |
| Space & placement | 7.5/10 | 5.0/10 |
| Light & reflections | 7.0/10 | 5.5/10 |
| Purposeful detail | 6.5/10 | 5.5/10 |
| Artistry & character | 5.0/10 | 5.0/10 |
| Materials & effects | 7.0/10 | 6.0/10 |
| Visual integrity | 5.5/10 | 5.0/10 |
Hy4 preview
A young blue dragon floating among clouds tests curved anatomy, expressive features and the contrast between soft clouds and glossy surfaces.
Step 5 Preview
Character scenes test expression, anatomy, materials and coherent visual construction.
Precise visual recall and portrait reconstruction.


Hy4 preview
A recognizable but basic Mona Lisa interpretation with a cohesive earthy palette and atmospheric hills. The rigid neck, generic face and unresolved folded-hand pose limit replication and anatomy. Large silhouettes and layer boundaries are comparatively clear, warranting stronger integrity credit than the sparse detail and simplified construction.
Step 5 Preview
A recognizable, coherent simplification with purposeful facial contours and differentiated fingers. These provide more construction and detail than the broad silhouette alone suggests. The oversized face, frontal seated pose, unresolved wrists and sparse landscape still substantially limit likeness, depth and finish.
| Category | Hy4 preview | Step 5 Preview |
|---|---|---|
| Task & likeness | 2.5/10 | 4.0/10 |
| Anatomy & construction | 2.5/10 | 4.0/10 |
| Space & placement | 2.5/10 | 4.0/10 |
| Light & reflections | 1.5/10 | 3.5/10 |
| Purposeful detail | 2.5/10 | 4.0/10 |
| Artistry & character | 1.5/10 | 4.0/10 |
| Materials & effects | 2.5/10 | 3.0/10 |
| Visual integrity | 4.0/10 | 3.5/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Hy4 preview
A cheerful beach illustration fulfills the visible subject requirements with coherent foreground construction and a harmonious sunset palette. Shallow depth, schematic reflections, ambiguous blue airborne forms and exposed geometry beneath the sunset limit its finish. Small accessories are readable, but materials and surface detail remain simplified.
Step 5 Preview
A recognizable sunset beach with clear warm-cool contrast and playful accessories. Basic animal construction, shallow foreground placement and schematic reflections limit spatial and physical credibility. Sparse descriptive detail and abruptly ended sky bands constrain the finish.
| Category | Hy4 preview | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.5/10 | 4.0/10 |
| Anatomy & construction | 5.5/10 | 3.0/10 |
| Space & placement | 6.5/10 | 3.5/10 |
| Light & reflections | 5.0/10 | 3.5/10 |
| Purposeful detail | 6.0/10 | 3.0/10 |
| Artistry & character | 5.5/10 | 3.0/10 |
| Materials & effects | 5.0/10 | 3.5/10 |
| Visual integrity | 6.0/10 | 4.0/10 |
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Physical reasoning, light and visual reconstruction.


Hy4 preview
This benchmark has not been assessed yet.
Step 5 Preview
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.


Hy4 preview
A lively cartoon communicates the animal pair traveling across water. Curving waves, rising spray and locally modeled gray forms strengthen motion and volume. Ambiguous seating, simplified joints and unclear control routing limit construction. Competing focal elements, decorative foam and inconsistent illumination leave the finish uneven.
Step 5 Preview
Recognizable animals, a bright palette and identifying accessories support a basic cartoon. Primitive anatomy, partial seated support, unresolved steering and weak hull-water contact limit the central action. Lighting and spray provide atmosphere without establishing convincing physical depth.
| Category | Hy4 preview | Step 5 Preview |
|---|---|---|
| Task & likeness | 7.0/10 | 4.0/10 |
| Anatomy & construction | 4.0/10 | 4.5/10 |
| Space & placement | 6.0/10 | 3.0/10 |
| Light & reflections | 6.5/10 | 3.5/10 |
| Purposeful detail | 5.5/10 | 4.0/10 |
| Artistry & character | 4.5/10 | 3.5/10 |
| Materials & effects | 5.5/10 | 3.0/10 |
| Visual integrity | 5.0/10 | 3.0/10 |
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.


Hy4 preview
A recognizable, playful pelican cyclist with readable wheels, accessories and landscape layers. Form shading and ground shadows provide competent depth. Angular legs, uncertain pedal engagement and absent steering contact limit the riding construction; crowded overlaps and simple surfaces constrain refinement.
Step 5 Preview
The pelican and bicycle are recognizable, with a pleasant palette and basic diffuse shading. The riding relationship fails physically: the bird is unsupported, the front wheel is unmounted, and pedalling is unresolved. Simple geometric construction and sparse material treatment further limit the drawing.
| Category | Hy4 preview | Step 5 Preview |
|---|---|---|
| Task & likeness | 7.5/10 | 3.0/10 |
| Anatomy & construction | 4.5/10 | 3.0/10 |
| Space & placement | 6.5/10 | 3.0/10 |
| Light & reflections | 7.0/10 | 3.0/10 |
| Purposeful detail | 6.0/10 | 4.0/10 |
| Artistry & character | 5.0/10 | 3.0/10 |
| Materials & effects | 5.0/10 | 3.0/10 |
| Visual integrity | 7.0/10 | 2.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.