GPT-6.1 Terra 62.0/100Rank 9/50

STEALTHMARK · HEAD TO HEAD
All comparisons ↗GPT-6.1 Terra leads Step 5 Preview by 21.4 points on StealthMark, 60.4 to 39.0. It leads on all 9 benchmarks. GPT-6.1 Terra scores higher on Beach, with its largest category advantage in anatomy & construction.
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-6.1 Terra ↗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-6.1 Terra
The sphere, airborne black and first reflected silhouettes preserve important geometry within the portrait frame. Paint deformation, contact order and forward transport are supported, with a small crimson endpoint overshoot. Major optical omissions dominate: short finite reflection sequences and smooth bands replace extensive, spatially ordered mirror imagery. Dark gloss and crisp upper emitter shapes provide partial material credit.
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-6.1 Terra | Step 5 Preview |
|---|---|---|
| State at 600 ms | 23.0/25 | 20.0/25 |
| Camera and placement | 11.0/15 | 13.5/15 |
| Reflections | 33.0/120 | 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-6.1 Terra
A balanced serpent emblem with six attached outward heads, delicate scales and softly rounded bodies. Its compact silhouette reads clearly, but central routing does not establish every alternating crossing or crisp inward corner. Repetitive texture, limited facial anatomy and weak contact shadows constrain its organic character.
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-6.1 Terra | Step 5 Preview |
|---|---|---|
| Task & likeness | 7.5/10 | 6.0/10 |
| Anatomy & construction | 6.5/10 | 4.5/10 |
| Space & placement | 6.5/10 | 5.0/10 |
| Light & reflections | 6.0/10 | 5.5/10 |
| Purposeful detail | 6.5/10 | 5.5/10 |
| Artistry & character | 6.5/10 | 5.0/10 |
| Materials & effects | 6.0/10 | 6.0/10 |
| Visual integrity | 6.0/10 | 5.0/10 |
GPT-6.1 Terra
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-6.1 Terra
A recognizable interpretation with developed facial shading, shaped sleeve folds and purposeful small features. These strengths support modest upward calibration, while the frontal torso, elongated proportions, schematic finger joints and unresolved seated support keep replication and construction uneven.
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-6.1 Terra | Step 5 Preview |
|---|---|---|
| Task & likeness | 5.5/10 | 4.0/10 |
| Anatomy & construction | 6.5/10 | 4.0/10 |
| Space & placement | 4.5/10 | 4.0/10 |
| Light & reflections | 6.5/10 | 3.5/10 |
| Purposeful detail | 6.0/10 | 4.0/10 |
| Artistry & character | 6.0/10 | 4.0/10 |
| Materials & effects | 6.0/10 | 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-6.1 Terra
A coherent sunset illustration with clear prompt fulfillment, controlled framing and varied, purposeful small details. Simplified joints, frontal staging, flattened animal forms and weakly directional shadows limit its anatomical, spatial and physical sophistication.
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-6.1 Terra | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.5/10 | 4.0/10 |
| Anatomy & construction | 7.5/10 | 3.0/10 |
| Space & placement | 6.5/10 | 3.5/10 |
| Light & reflections | 5.5/10 | 3.5/10 |
| Purposeful detail | 7.5/10 | 3.0/10 |
| Artistry & character | 7.0/10 | 3.0/10 |
| Materials & effects | 6.5/10 | 3.5/10 |
| Visual integrity | 7.5/10 | 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-6.1 Terra
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-6.1 Terra
A coherent cartoon with expressive animals, readable steering and a clear wake. Fine facial and hull details reward inspection. The main limits are the boatlike craft, simplified joints, weakly braced frontal raccoon and minimal directional lighting or material depth.
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-6.1 Terra | Step 5 Preview |
|---|---|---|
| Task & likeness | 6.5/10 | 4.0/10 |
| Anatomy & construction | 5.5/10 | 4.5/10 |
| Space & placement | 6.0/10 | 3.0/10 |
| Light & reflections | 5.0/10 | 3.5/10 |
| Purposeful detail | 7.0/10 | 4.0/10 |
| Artistry & character | 6.0/10 | 3.5/10 |
| Materials & effects | 6.0/10 | 3.0/10 |
| Visual integrity | 7.0/10 | 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-6.1 Terra
A coherent pelican cyclist with expressive proportions, purposeful feather detail and developed bicycle machinery. Continuous body contours, aligned wheels and readable pedal contacts support the scene. Simplified articulation, shallow modelling and an unresolved steering connection limit construction and placement.
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-6.1 Terra | Step 5 Preview |
|---|---|---|
| Task & likeness | 7.0/10 | 3.0/10 |
| Anatomy & construction | 7.0/10 | 3.0/10 |
| Space & placement | 6.0/10 | 3.0/10 |
| Light & reflections | 5.5/10 | 3.0/10 |
| Purposeful detail | 7.0/10 | 4.0/10 |
| Artistry & character | 6.5/10 | 3.0/10 |
| Materials & effects | 5.5/10 | 3.0/10 |
| Visual integrity | 6.0/10 | 2.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.