Gemma 4 31B 30.2/100Rank 30/50

STEALTHMARK · HEAD TO HEAD
All comparisons ↗GPT-6.1 Terra leads Gemma 4 31B by 34.6 points on StealthMark, 60.4 to 25.8. It leads on all 9 benchmarks. GPT-6.1 Terra 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
Gemma 4 31B is 13× cheaper per output token. GPT-6.1 Terra scores higher on StealthMark and takes 4× more context.
Full datasheets, every price and sourceGemma 4 31B ↗GPT-6.1 Terra ↗
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 ↗


Gemma 4 31B
The sphere's volume, separate airborne black blob and vertical color ordering are readable. The large, low sphere, plain surrounding planes and absent nested optical imagery leave the central geometric and reflection requirements unsupported. Paint contact and transport remain unresolved. Material credit recognizes the visible convex shading, highlights and distinct surface colors while retaining deductions for the schematic finish and oversized blobs.
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.
| Category | Gemma 4 31B | GPT-6.1 Terra |
|---|---|---|
| State at 600 ms | 11.0/25 | 23.0/25 |
| Camera and placement | 3.0/15 | 11.0/15 |
| Reflections | 0.0/120 | 33.0/120 |
| Materials and scale | 5.5/10 | 7.5/10 |
| 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.


Gemma 4 31B
A clean, appealing luminous mascot with coherent body continuity and a readable jar-hugging pose. Rounded highlights, smooth gradients and balanced framing work well. The teardrop silhouette, modest eyes and nearly even grin only partly satisfy the character brief; sparse jar construction and simple geometry limit sophistication.
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.
| Category | Gemma 4 31B | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 6.0/10 | 7.5/10 |
| Anatomy & construction | 6.0/10 | 6.5/10 |
| Space & placement | 7.5/10 | 6.5/10 |
| Light & reflections | 6.5/10 | 6.0/10 |
| Purposeful detail | 5.5/10 | 6.5/10 |
| Artistry & character | 5.0/10 | 6.5/10 |
| Materials & effects | 6.5/10 | 6.0/10 |
| Visual integrity | 7.5/10 | 6.0/10 |
Gemma 4 31B
A small luminous creature proudly holding an empty glass jar tests expression, transparent materials and the balance of character and prop.
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.
Precise visual recall and portrait reconstruction.


Gemma 4 31B
The portrait is recognizable through its silhouette, palette and smile, with clean execution of simple shapes. Replication remains weak: the face and pose differ markedly, hands become fingerless ovals, clothing lacks construction, and the landscape loses its atmospheric detail. Basic gradients provide limited volume.
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.
| Category | Gemma 4 31B | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 3.0/10 | 5.5/10 |
| Anatomy & construction | 4.0/10 | 6.5/10 |
| Space & placement | 4.0/10 | 4.5/10 |
| Light & reflections | 3.5/10 | 6.5/10 |
| Purposeful detail | 2.0/10 | 6.0/10 |
| Artistry & character | 3.5/10 | 6.0/10 |
| Materials & effects | 2.5/10 | 6.0/10 |
| Visual integrity | 5.5/10 | 6.5/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Gemma 4 31B
A coherent beach illustration with clean silhouettes, a sweeping shoreline and an effective sunset palette. Requested subjects are recognizable, but primitive animal construction, sparse detail, unsupported palm placement and schematic reflections limit drawing sophistication and physical credibility.
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.
| Category | Gemma 4 31B | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 5.0/10 | 8.5/10 |
| Anatomy & construction | 2.0/10 | 7.5/10 |
| Space & placement | 5.0/10 | 6.5/10 |
| Light & reflections | 2.5/10 | 5.5/10 |
| Purposeful detail | 2.0/10 | 7.5/10 |
| Artistry & character | 2.0/10 | 7.0/10 |
| Materials & effects | 2.0/10 | 6.5/10 |
| Visual integrity | 5.0/10 | 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.


Gemma 4 31B
This benchmark has not been assessed yet.
GPT-6.1 Terra
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.


Gemma 4 31B
Clean, simple silhouettes communicate a raccoon riding on a dog. Limited animal specificity, absent steering controls and a flat platform weaken the requested scene. Small facial marks provide purposeful detail, while unresolved support, flat lighting and schematic water restrict physical coherence. Primitive but coherent construction supports basic drawing quality.
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.
| Category | Gemma 4 31B | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 2.5/10 | 6.5/10 |
| Anatomy & construction | 3.0/10 | 5.5/10 |
| Space & placement | 4.0/10 | 6.0/10 |
| Light & reflections | 1.0/10 | 5.0/10 |
| Purposeful detail | 2.5/10 | 7.0/10 |
| Artistry & character | 2.5/10 | 6.0/10 |
| Materials & effects | 2.0/10 | 6.0/10 |
| Visual integrity | 7.0/10 | 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.


Gemma 4 31B
A clean, readable illustration with balanced placement and coherent basic geometry. The sky gradient and ground shadow establish diffuse illumination. Primitive shapes and sparse detail limit artistry, while unclear leg attachment, missing pedal contact and unresolved steering weaken the riding action.
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.
| Category | Gemma 4 31B | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 4.0/10 | 7.0/10 |
| Anatomy & construction | 3.0/10 | 7.0/10 |
| Space & placement | 4.5/10 | 6.0/10 |
| Light & reflections | 3.0/10 | 5.5/10 |
| Purposeful detail | 3.0/10 | 7.0/10 |
| Artistry & character | 3.0/10 | 6.5/10 |
| Materials & effects | 4.0/10 | 5.5/10 |
| Visual integrity | 4.5/10 | 6.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.