Gemini 4 Argon 48.6/100Rank 19/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Gemini 4 Argon leads GPT-5.6 Luna by 29.6 points on StealthMark, 67.4 to 37.8. It leads on all 9 benchmarks. Gemini 4 Argon 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
Gemini 4 Argon scores higher on StealthMark. GPT-5.6 Luna is 8.3× cheaper per output token and runs 26% faster in our speed test. Both take about 1M tokens of context.
Full datasheets, every price and sourceGemini 4 Argon ↗GPT-5.6 Luna ↗
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 ↗


Gemini 4 Argon
The central sphere, separate airborne black blob, flattened cyan contact and displaced crimson aftermath support the principal camera and physical-state requirements. Open lateral lanes and initial reflection placements provide partial optical structure, but missing outer chains, sparse nested imagery and incomplete emitter mappings remain substantial limitations. The raised crimson mass also weakens paint-scale fidelity.
GPT-5.6 Luna
The room enclosure has coherent symmetric perspective, with the overhead panel, sphere and black aligned centrally. The sphere and airborne black occupy substantially lower positions than the reference framing, inconsistent with the prescribed camera aim. The diagonal crimson streak does not establish the required surface transport. Faint wall sphere images provide limited mirrored correspondence, but the shallow floor image, missing receding chains, absent nested sphere imagery and sparse emitter mapping leave most reflection structure unsupported.
| Category | Gemini 4 Argon | GPT-5.6 Luna |
|---|---|---|
| State at 600 ms | 24.5/25 | 15.0/25 |
| Camera and placement | 14.5/15 | 4.0/15 |
| Reflections | 50.5/120 | 3.5/120 |
| Materials and scale | 8.5/10 | 6.5/10 |
| 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.


Gemini 4 Argon
An appealing, controlled illustration with a distinctive buoyant silhouette, expressive comic face and rich luminous colour. The full composition and grounded slipper read clearly. The principal limitation is the crowded raised-foot interaction: paws, toes and lining overlap without making the bent leg or tight fit unmistakable.
GPT-5.6 Luna
Six pale, outward-facing heads and six rounded lobes make the knot recognizable. The central hexagonal opening remains clear. However, broad gray crossing panels flatten the weave, several inner joins resemble capped strips, and sparse oversized scale marks leave the bodies looking more like decorated ribbons than living snakes.
| Category | Gemini 4 Argon | GPT-5.6 Luna |
|---|---|---|
| Task & likeness | 7.0/10 | 7.5/10 |
| Anatomy & construction | 6.5/10 | 6.0/10 |
| Space & placement | 7.5/10 | 6.5/10 |
| Light & reflections | 7.5/10 | 5.0/10 |
| Purposeful detail | 8.0/10 | 5.5/10 |
| Artistry & character | 7.0/10 | 6.0/10 |
| Materials & effects | 7.0/10 | 5.0/10 |
| Visual integrity | 7.5/10 | 6.0/10 |
Gemini 4 Argon
A luminous little dragon struggles with its bedtime slippers while a buoyant tail pulls it upward. The scene tests expressive anatomy, physical contact and the contrast between translucent forms and heavy objects.
GPT-5.6 Luna
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.


Gemini 4 Argon
A coherent, moderately complex Mona Lisa reconstruction with substantial portrait volume, articulated clothing and landscape recession. Specific source features support replication beyond recognition alone. Altered facial likeness, uncertain crossed-hand anatomy and pervasive colored crackle keep the result uneven despite its developed shading and detail.
GPT-5.6 Luna
The central portrait, dark clothing, crossed hands and muted landscape clearly evoke Mona Lisa. Replication is limited by the elongated face, conspicuous eyes and simplified smile. Overlapping fingers have uncertain anatomy, while broad gradients and heavy outlines flatten the portrait. The composition and restrained palette remain coherent.
| Category | Gemini 4 Argon | GPT-5.6 Luna |
|---|---|---|
| Task & likeness | 6.5/10 | 3.5/10 |
| Anatomy & construction | 6.5/10 | 3.5/10 |
| Space & placement | 6.5/10 | 4.0/10 |
| Light & reflections | 7.0/10 | 4.5/10 |
| Purposeful detail | 6.0/10 | 4.0/10 |
| Artistry & character | 6.5/10 | 4.0/10 |
| Materials & effects | 7.0/10 | 3.5/10 |
| Visual integrity | 7.0/10 | 4.5/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Gemini 4 Argon
A strong decorative beach illustration with controlled color, intricate silhouettes and abundant playful detail. Connected dolphin forms and recognizable equipment support its construction, while the aligned sunset reflection anchors the scene. Compressed wave depth, ambiguous foreground support and uneven reflection specificity limit physical coherence. The saved comparisons support retaining the category assessments.
GPT-5.6 Luna
The warm sunset, palm silhouette and varied beach activities create an appealing, readable composition. Animals, birds and a broad sun reflection satisfy the brief. Drawing remains elementary: angular airborne sea animals lack splash or convincing motion, the crab's claws are awkwardly constructed, and repeated reflection bands suggest a stepped platform. Clean outlines and pleasant colors exceed the anatomical and spatial sophistication.
| Category | Gemini 4 Argon | GPT-5.6 Luna |
|---|---|---|
| Task & likeness | 9.0/10 | 7.5/10 |
| Anatomy & construction | 7.5/10 | 4.0/10 |
| Space & placement | 8.5/10 | 5.5/10 |
| Light & reflections | 8.5/10 | 4.0/10 |
| Purposeful detail | 9.0/10 | 6.5/10 |
| Artistry & character | 8.0/10 | 3.5/10 |
| Materials & effects | 8.0/10 | 4.0/10 |
| Visual integrity | 8.0/10 | 3.5/10 |
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Physical reasoning, light and visual reconstruction.


Gemini 4 Argon
This benchmark has not been assessed yet.
GPT-5.6 Luna
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.


Gemini 4 Argon
An accomplished illustration with expressive characters, intricate spray and strong depth. Direct back seating, steering connections and hull-water contact are only partly demonstrated. Clean graphic execution and purposeful detail remain strengths, while shadows and reflections provide limited physical grounding.
GPT-5.6 Luna
Expressive animals, a striped tail and clean outlines make the scene appealing and readable. The raccoon sits convincingly on the dog's back, but the overlapping steering paws are ambiguous and the control stem stops above the hull. Broad wake shapes suggest motion; the glowing sun lacks a corresponding water reflection.
| Category | Gemini 4 Argon | GPT-5.6 Luna |
|---|---|---|
| Task & likeness | 8.5/10 | 7.0/10 |
| Anatomy & construction | 8.0/10 | 5.0/10 |
| Space & placement | 7.5/10 | 6.5/10 |
| Light & reflections | 7.5/10 | 6.0/10 |
| Purposeful detail | 8.5/10 | 6.5/10 |
| Artistry & character | 8.5/10 | 4.5/10 |
| Materials & effects | 8.0/10 | 5.5/10 |
| Visual integrity | 8.0/10 | 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.


Gemini 4 Argon
An expressive, detailed illustration with controlled gradients and coherent environmental depth. Continuous body contours and connected bicycle components establish competent construction. Steering grip and pedal engagement remain less explicit than the decorative details and wheel placement. These contact uncertainties limit action and placement credit without establishing broken anatomy.
GPT-5.6 Luna
A recognizable pelican cyclist with an expressive profile, balanced composition and controlled outlines. Head, neck and torso connect coherently. The bicycle wheels and frame are convincing, but overlapping feet obscure pedal contact, the drivetrain lacks a clear chain, and the wing's handlebar grip is schematic. Atmospheric color succeeds more strongly than directional lighting or material depth.
| Category | Gemini 4 Argon | GPT-5.6 Luna |
|---|---|---|
| Task & likeness | 9.0/10 | 8.5/10 |
| Anatomy & construction | 8.5/10 | 5.5/10 |
| Space & placement | 8.0/10 | 7.5/10 |
| Light & reflections | 8.0/10 | 6.5/10 |
| Purposeful detail | 8.5/10 | 6.5/10 |
| Artistry & character | 8.5/10 | 5.5/10 |
| Materials & effects | 8.5/10 | 7.0/10 |
| Visual integrity | 8.5/10 | 6.5/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.