GPT-5.6 Sol 62.9/100Rank 8/49

STEALTHMARK · HEAD TO HEAD
All comparisons ↗GPT-5.6 Sol leads Step 5 Preview by 15.1 points on StealthMark, 54.1 to 39.0. It leads on 8 of 9 benchmarks, including both games, and Step 5 Preview on 1. GPT-5.6 Sol 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 1.05M tokens of context.
Full datasheets, every price and sourceGPT-5.6 Sol ↗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 ↗


GPT-5.6 Sol
The central sphere and paint ordering are supported, but a frontal, centrally converging chamber replaces the required corner perspective. The first wall and floor images have incorrect placement and scale relationships. Sparse reflection cues remain, while continuous outer chains, open lateral sightlines, dense planar light sequences and curved nested spherical imagery are largely missing.
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 | GPT-5.6 Sol | Step 5 Preview |
|---|---|---|
| State at 600 ms | 23.0/25 | 20.0/25 |
| Camera and placement | 6.0/15 | 13.5/15 |
| Reflections | 11.0/120 | 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.


GPT-5.6 Sol
Six evenly spaced lobes, outward-facing heads and a clear central hexagon establish the requested knot. The ivory silhouette is controlled, but broad crossing bands resemble rigid strips, shading provides limited muscular volume, and repetitive scale lines extend across black loop openings. Small oval heads have readable eyes and mouths but limited anatomical character or moist surface detail.
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 | GPT-5.6 Sol | Step 5 Preview |
|---|---|---|
| Task & likeness | 7.5/10 | 6.0/10 |
| Anatomy & construction | 6.0/10 | 4.5/10 |
| Space & placement | 7.0/10 | 5.0/10 |
| Light & reflections | 5.0/10 | 5.5/10 |
| Purposeful detail | 6.0/10 | 5.5/10 |
| Artistry & character | 6.5/10 | 5.0/10 |
| Materials & effects | 4.5/10 | 6.0/10 |
| Visual integrity | 6.0/10 | 5.0/10 |
GPT-5.6 Sol
A pale serpent woven into an interlocking knot tests connected anatomy, repeated structure and readable overlaps. Organic surface detail must work with the overall geometry.
Step 5 Preview
Character scenes test expression, anatomy, materials and coherent visual construction.
Precise visual recall and portrait reconstruction.


GPT-5.6 Sol
The crossed hands, dark dress and winding landscape establish the Mona Lisa composition. Replication is limited by enlarged eyes, an elongated face and a more frontal pose. Broad gradients suggest volume, but outlined features and flattened, overlapping fingers weaken the portrait. The frame and restrained palette unify the image; visible grain adds texture without convincing painterly transitions.
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 | GPT-5.6 Sol | Step 5 Preview |
|---|---|---|
| Task & likeness | 4.5/10 | 4.0/10 |
| Anatomy & construction | 4.0/10 | 4.0/10 |
| Space & placement | 5.5/10 | 4.0/10 |
| Light & reflections | 5.0/10 | 3.5/10 |
| Purposeful detail | 5.0/10 | 4.0/10 |
| Artistry & character | 4.5/10 | 4.0/10 |
| Materials & effects | 5.5/10 | 3.0/10 |
| Visual integrity | 6.5/10 | 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.


GPT-5.6 Sol
The purple-to-gold sunset, framing palms and varied beach activities create an appealing, coherent illustration. The sun’s reflection establishes a clear focal path. Figures and animals are recognizable but geometrically simplified; airborne dolphins lack convincing splashes, and the boat reflection is schematic. Clean silhouettes and playful details succeed more strongly than anatomical depth or material realism.
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 | GPT-5.6 Sol | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.5/10 | 4.0/10 |
| Anatomy & construction | 6.0/10 | 3.0/10 |
| Space & placement | 7.0/10 | 3.5/10 |
| Light & reflections | 6.5/10 | 3.5/10 |
| Purposeful detail | 7.0/10 | 3.0/10 |
| Artistry & character | 6.5/10 | 3.0/10 |
| Materials & effects | 6.5/10 | 3.5/10 |
| Visual integrity | 7.0/10 | 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.


GPT-5.6 Sol
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.


GPT-5.6 Sol
Expressive faces, bold silhouettes and layered waves make an appealing cartoon. The raccoon sits convincingly behind the dog's shoulders, and the dog's forward paw reaches the steering grip. Steering construction and seated support remain somewhat ambiguous. The glowing sunset lacks a corresponding warm reflection or consistent illumination on the riders.
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 | GPT-5.6 Sol | Step 5 Preview |
|---|---|---|
| Task & likeness | 6.5/10 | 4.0/10 |
| Anatomy & construction | 5.0/10 | 4.5/10 |
| Space & placement | 6.5/10 | 3.0/10 |
| Light & reflections | 6.5/10 | 3.5/10 |
| Purposeful detail | 7.5/10 | 4.0/10 |
| Artistry & character | 5.0/10 | 3.5/10 |
| Materials & effects | 7.0/10 | 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.


GPT-5.6 Sol
The expressive pelican and balanced coastal composition remain appealing, but a sky-colored slit between the neck contours above the wing leaves the central anatomy incoherent. This visible construction and layering defect prevents a clean-integrity assessment. Clustered feet lack clear pedal contacts and the chain routing is schematic; lighting and water reflections remain graphic.
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 | GPT-5.6 Sol | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.5/10 | 3.0/10 |
| Anatomy & construction | 5.0/10 | 3.0/10 |
| Space & placement | 7.5/10 | 3.0/10 |
| Light & reflections | 7.5/10 | 3.0/10 |
| Purposeful detail | 8.0/10 | 4.0/10 |
| Artistry & character | 6.5/10 | 3.0/10 |
| Materials & effects | 7.0/10 | 3.0/10 |
| Visual integrity | 4.5/10 | 2.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.