GPT-5.6 Sol 62.9/100Rank 8/49

STEALTHMARK · HEAD TO HEAD
All comparisons ↗GPT-5.6 Sol leads Inkling-Small by 26.5 points on StealthMark, 54.1 to 27.6. It leads on all 9 benchmarks. GPT-5.6 Sol scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.
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 ↗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 ↗


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.
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 | GPT-5.6 Sol | Inkling-Small |
|---|---|---|
| State at 600 ms | 23.0/25 | 14.0/25 |
| Camera and placement | 6.0/15 | 3.0/15 |
| Reflections | 11.0/120 | 8.0/120 |
| Materials and scale | 7.5/10 | 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.


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.
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 | GPT-5.6 Sol | Inkling-Small |
|---|---|---|
| Task & likeness | 7.5/10 | 2.5/10 |
| Anatomy & construction | 6.0/10 | 1.5/10 |
| Space & placement | 7.0/10 | 3.5/10 |
| Light & reflections | 5.0/10 | 3.0/10 |
| Purposeful detail | 6.0/10 | 4.5/10 |
| Artistry & character | 6.5/10 | 3.0/10 |
| Materials & effects | 4.5/10 | 3.5/10 |
| Visual integrity | 6.0/10 | 2.0/10 |
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.
Inkling-Small
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.
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 | GPT-5.6 Sol | Inkling-Small |
|---|---|---|
| Task & likeness | 4.5/10 | 2.5/10 |
| Anatomy & construction | 4.0/10 | 2.5/10 |
| Space & placement | 5.5/10 | 3.0/10 |
| Light & reflections | 5.0/10 | 2.5/10 |
| Purposeful detail | 5.0/10 | 2.0/10 |
| Artistry & character | 4.5/10 | 2.5/10 |
| Materials & effects | 5.5/10 | 2.0/10 |
| Visual integrity | 6.5/10 | 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.


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.
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 | GPT-5.6 Sol | Inkling-Small |
|---|---|---|
| Task & likeness | 8.5/10 | 3.5/10 |
| Anatomy & construction | 6.0/10 | 3.0/10 |
| Space & placement | 7.0/10 | 3.0/10 |
| Light & reflections | 6.5/10 | 3.0/10 |
| Purposeful detail | 7.0/10 | 3.0/10 |
| Artistry & character | 6.5/10 | 3.0/10 |
| Materials & effects | 6.5/10 | 2.5/10 |
| Visual integrity | 7.0/10 | 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.


GPT-5.6 Sol
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.


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.
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 | GPT-5.6 Sol | Inkling-Small |
|---|---|---|
| Task & likeness | 6.5/10 | 4.0/10 |
| Anatomy & construction | 5.0/10 | 3.0/10 |
| Space & placement | 6.5/10 | 4.0/10 |
| Light & reflections | 6.5/10 | 5.0/10 |
| Purposeful detail | 7.5/10 | 5.5/10 |
| Artistry & character | 5.0/10 | 4.0/10 |
| Materials & effects | 7.0/10 | 5.0/10 |
| Visual integrity | 5.0/10 | 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.


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.
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 | GPT-5.6 Sol | Inkling-Small |
|---|---|---|
| Task & likeness | 8.5/10 | 4.0/10 |
| 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 | 4.5/10 |
| Artistry & character | 6.5/10 | 5.0/10 |
| Materials & effects | 7.0/10 | 4.5/10 |
| Visual integrity | 4.5/10 | 3.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.