Step 5 Preview 59.9/100Rank 42/491 of 3 levels

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) leads Step 5 Preview by 23.6 points on StealthMark, 62.6 to 39.0. It leads on 8 of 9 benchmarks, including Foresight, and Step 5 Preview on 1, including Latch. Union Alpha 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
Step 5 Preview takes 4× more context. Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) scores higher on StealthMark.
Full datasheets, every price and sourceStep 5 Preview ↗Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) ↗
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 ↗


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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
Recognizable near-field sphere placement and bilateral convergence provide limited optical structure. Broad gray regions interrupt lateral sightlines and truncate side-floor images. Missing outer chains, absent nested sphere imagery and incomplete planar and curved emitter mappings dominate the reflection system.
| Category | Step 5 Preview | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| State at 600 ms | 20.0/25 | 24.0/25 |
| Camera and placement | 13.5/15 | 13.5/15 |
| Reflections | 20.0/120 | 34.5/120 |
| Materials and scale | 7.0/10 | 10.0/10 |
| 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.


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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
A strong futuristic emblem with clear hierarchy, controlled negative space and distinctive typography. Silver and gunmetal layers give the sweeping ribbons convincing graphic depth, while red accents remain restrained. Ambiguous concealed connections and occasionally abrupt highlight bands limit the construction and material realism.
| Category | Step 5 Preview | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 6.0/10 | 9.0/10 |
| Anatomy & construction | 4.5/10 | 7.5/10 |
| Space & placement | 5.0/10 | 8.5/10 |
| Light & reflections | 5.5/10 | 7.5/10 |
| Purposeful detail | 5.5/10 | 7.0/10 |
| Artistry & character | 5.0/10 | 7.5/10 |
| Materials & effects | 6.0/10 | 7.5/10 |
| Visual integrity | 5.0/10 | 7.0/10 |
Step 5 Preview
Character scenes test expression, anatomy, materials and coherent visual construction.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
An interwoven metallic emblem tests ribbon geometry, overlapping forms and the appearance of reflective metal against a dark background.
Precise visual recall and portrait reconstruction.


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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
The centered portrait, folded hands, dark clothing and hazy landscape clearly evoke the Mona Lisa. Muted colors and soft facial shading create a coherent illustration, but replication remains schematic: the face is broad, eyes outlined, smile simplified and overlapping fingers poorly resolved. Angular landscape shapes and flat fabric limit depth and painterly richness.
| Category | Step 5 Preview | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 4.0/10 | 6.5/10 |
| Anatomy & construction | 4.0/10 | 5.0/10 |
| Space & placement | 4.0/10 | 6.5/10 |
| Light & reflections | 3.5/10 | 6.0/10 |
| Purposeful detail | 4.0/10 | 5.5/10 |
| Artistry & character | 4.0/10 | 6.5/10 |
| Materials & effects | 3.0/10 | 5.0/10 |
| Visual integrity | 3.5/10 | 7.0/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
A cohesive sunset palette, sweeping shoreline and playful animals make an appealing beach illustration. The sun’s reflection establishes a clear focal axis, balanced by the palm and umbrella. Clean silhouettes and small decorative features reward inspection, though simplified anatomy, repetitive reflection bars and generic oval shadows limit volume and naturalism.
| Category | Step 5 Preview | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 4.0/10 | 9.0/10 |
| Anatomy & construction | 3.0/10 | 7.0/10 |
| Space & placement | 3.5/10 | 8.0/10 |
| Light & reflections | 3.5/10 | 7.0/10 |
| Purposeful detail | 3.0/10 | 7.0/10 |
| Artistry & character | 3.0/10 | 6.0/10 |
| Materials & effects | 3.5/10 | 6.5/10 |
| Visual integrity | 4.0/10 | 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.


Step 5 Preview
This benchmark has not been assessed yet.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
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.


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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
Expressive animals, a readable riding arrangement and sweeping spray create an appealing cartoon. The raccoon sits convincingly on the dog's back, but the dog's paw does not clearly grip the handlebar, whose connection to the hull is unresolved. Flat lighting provides little volume or reflection. A dark rectangular strip interrupts the upper-right background.
| Category | Step 5 Preview | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 4.0/10 | 8.0/10 |
| Anatomy & construction | 4.5/10 | 6.5/10 |
| Space & placement | 3.0/10 | 7.5/10 |
| Light & reflections | 3.5/10 | 5.5/10 |
| Purposeful detail | 4.0/10 | 7.0/10 |
| Artistry & character | 3.5/10 | 7.0/10 |
| Materials & effects | 3.0/10 | 7.5/10 |
| Visual integrity | 3.0/10 | 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.


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.
Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM)
The pelican is immediately recognizable, with an expressive face, convincing bill silhouette and appealing pastel composition. Both legs connect to feet, and the wing reaches the handlebar. Bicycle construction is less resolved: the far pedal lacks a clear crank connection and no chain is visible. Clean contours and orderly spokes support the illustration, while flat lighting and simplified surfaces limit depth.
| Category | Step 5 Preview | Pareto 26.9 (Union of GPT-6 Astra + DeepSeek + GLM) |
|---|---|---|
| Task & likeness | 3.0/10 | 8.0/10 |
| Anatomy & construction | 3.0/10 | 6.0/10 |
| Space & placement | 3.0/10 | 7.0/10 |
| Light & reflections | 3.0/10 | 6.0/10 |
| Purposeful detail | 4.0/10 | 6.0/10 |
| Artistry & character | 3.0/10 | 6.0/10 |
| Materials & effects | 3.0/10 | 6.0/10 |
| Visual integrity | 2.0/10 | 8.5/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.