GPT-5.6 Sol 62.9/100Rank 8/51

STEALTHMARK · HEAD TO HEAD
All comparisons ↗GPT-5.6 Sol leads GPT-6.1 Terra Low by 12.8 points on StealthMark, 54.1 to 41.3. It leads on 8 of 9 benchmarks, including both games, and GPT-6.1 Terra Low on 1. GPT-5.6 Sol scores higher on Ground Truth.
See the difference ↘BENCHMARK BY BENCHMARK
DATASHEET
Full datasheets, every price and sourceGPT-5.6 Sol ↗
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.
GPT-6.1 Terra Low
Deformed colored paint and a separate airborne black body establish readable interaction history. Cyan has travelled too far, framing differs substantially, and the mirror system supplies only elementary bands and oval copies. Missing recursive geometry, nested spherical imagery and emitter mapping remain the dominant weaknesses.
| Category | GPT-5.6 Sol | GPT-6.1 Terra Low |
|---|---|---|
| State at 600 ms | 23.0/25 | 22.0/25 |
| Camera and placement | 6.0/15 | 4.0/15 |
| Reflections | 11.0/120 | 10.0/120 |
| Materials and scale | 7.5/10 | 6.0/10 |
| 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.
GPT-6.1 Terra Low
Six attached outward-facing heads, delicate scales and soft ivory shading establish an orderly decorative motif. Separate paddle-shaped bodies replace the required interlocking loops and leave no enclosed central hexagon. Surface detail provides interest, but repeated simple forms, schematic faces and limited anatomical modeling constrain the result.
| Category | GPT-5.6 Sol | GPT-6.1 Terra Low |
|---|---|---|
| Task & likeness | 7.5/10 | 4.0/10 |
| Anatomy & construction | 6.0/10 | 3.5/10 |
| Space & placement | 7.0/10 | 4.5/10 |
| 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 | 5.5/10 |
| Visual integrity | 6.0/10 | 4.0/10 |
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.
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.
GPT-6.1 Terra Low
A recognizable, coherent portrait with purposeful facial detail, warm local volume and layered scenery. The frontal pose, enlarged face, merged hands and shallow clothing construction substantially limit replication and drawing skill. The visible successes support retaining the current assessment.
| Category | GPT-5.6 Sol | GPT-6.1 Terra Low |
|---|---|---|
| Task & likeness | 4.5/10 | 5.0/10 |
| Anatomy & construction | 4.0/10 | 4.5/10 |
| Space & placement | 5.5/10 | 5.0/10 |
| Light & reflections | 5.0/10 | 6.0/10 |
| Purposeful detail | 5.0/10 | 5.0/10 |
| Artistry & character | 4.5/10 | 5.5/10 |
| Materials & effects | 5.5/10 | 5.0/10 |
| Visual integrity | 6.5/10 | 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.


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.
GPT-6.1 Terra Low
A coherent sunset scene demonstrates the beach, animals, birds and reflections. Flowing silhouettes, warm color transitions and intact attachments are its strongest properties. Simplified anatomy, the turtle's elevated viewing angle and symbolic surface effects constrain drawing complexity and physical depth.
| Category | GPT-5.6 Sol | GPT-6.1 Terra Low |
|---|---|---|
| Task & likeness | 8.5/10 | 8.0/10 |
| Anatomy & construction | 6.0/10 | 5.5/10 |
| Space & placement | 7.0/10 | 5.5/10 |
| Light & reflections | 6.5/10 | 6.5/10 |
| Purposeful detail | 7.0/10 | 6.0/10 |
| Artistry & character | 6.5/10 | 5.0/10 |
| Materials & effects | 6.5/10 | 5.5/10 |
| Visual integrity | 7.0/10 | 7.5/10 |
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.
GPT-6.1 Terra Low
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.
GPT-6.1 Terra Low
Recognizable animals, a coherent craft and sweeping wake make an appealing cartoon. Basic limb construction, weakly demonstrated raccoon seating and limited shared perspective constrain the scene. Small identifying details work well, while lighting and materials remain broadly graphic.
| Category | GPT-5.6 Sol | GPT-6.1 Terra Low |
|---|---|---|
| Task & likeness | 6.5/10 | 6.5/10 |
| Anatomy & construction | 5.0/10 | 5.0/10 |
| Space & placement | 6.5/10 | 5.5/10 |
| Light & reflections | 6.5/10 | 4.5/10 |
| Purposeful detail | 7.5/10 | 6.0/10 |
| Artistry & character | 5.0/10 | 5.0/10 |
| Materials & effects | 7.0/10 | 5.0/10 |
| Visual integrity | 5.0/10 | 6.0/10 |
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.
GPT-6.1 Terra Low
A coherent coastal illustration with a distinctive pelican, controlled contours and clearly organised bicycle wheels. Visible saddle support and shaped neck and wing contours earn credit beyond basic geometric construction. Rubbery legs, unresolved pedal contacts and absent steering contact limit the riding action. Lighting and materials remain restrained and spatially shallow.
| Category | GPT-5.6 Sol | GPT-6.1 Terra Low |
|---|---|---|
| Task & likeness | 8.5/10 | 7.0/10 |
| Anatomy & construction | 5.0/10 | 5.5/10 |
| Space & placement | 7.5/10 | 6.0/10 |
| Light & reflections | 7.5/10 | 5.5/10 |
| Purposeful detail | 8.0/10 | 6.5/10 |
| Artistry & character | 6.5/10 | 6.0/10 |
| Materials & effects | 7.0/10 | 6.0/10 |
| Visual integrity | 4.5/10 | 6.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.