Gemini 3.8 Flash 45.4/100Rank 21/49

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Gemini 3.8 Flash leads Step 5 Preview by 8.9 points on StealthMark, 47.9 to 39.0. It leads on 7 of 9 benchmarks, including both games, and Step 5 Preview on 2. Gemini 3.8 Flash 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 1M tokens of context.
Full datasheets, every price and sourceGemini 3.8 Flash ↗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 ↗


Gemini 3.8 Flash
Crimson is carried well down the camera-facing surface, supporting its earlier interaction. The depiction remains highly simplified, with imperfect material rendering. Isolated wall and floor images and a few highlights provide scant reflective evidence; displaced first reflections, missing receding chains and absent nested sphere and emitter imagery leave the room's optical structure largely unsupported.
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 | Gemini 3.8 Flash | Step 5 Preview |
|---|---|---|
| State at 600 ms | 22.5/25 | 20.0/25 |
| Camera and placement | 11.0/15 | 13.5/15 |
| Reflections | 4.5/120 | 20.0/120 |
| Materials and scale | 7.0/10 | 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.


Gemini 3.8 Flash
The dominant four-point silhouette, luminous color progression, raised brows and enormous grin closely fulfill the brief. Attached, secondary limbs support the exuberant expression. Clean facial drawing and glossy eyes give strong character, while shallow depth, minimally articulated extremities and visible steps in the outer glow limit refinement.
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 | Gemini 3.8 Flash | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.0/10 | 6.0/10 |
| Anatomy & construction | 6.0/10 | 4.5/10 |
| Space & placement | 6.5/10 | 5.0/10 |
| Light & reflections | 7.0/10 | 5.5/10 |
| Purposeful detail | 5.0/10 | 5.5/10 |
| Artistry & character | 3.5/10 | 5.0/10 |
| Materials & effects | 5.0/10 | 6.0/10 |
| Visual integrity | 6.5/10 | 5.0/10 |
Gemini 3.8 Flash
A luminous star-shaped creature tests expressive features, a clear silhouette and smooth colour transitions.
Step 5 Preview
Character scenes test expression, anatomy, materials and coherent visual construction.
Precise visual recall and portrait reconstruction.


Gemini 3.8 Flash
The dark clothing, overlapping hands and hazy landscape make the Mona Lisa reference recognizable. Replication is limited by the frontal, elongated face, heavy mouth and chin, and poorly resolved hands, wrists and forearm. Soft shading gives some volume, but muddy transitions, blunt landscape shapes and rigid facial modeling weaken the portrait’s expression and painterly character.
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 | Gemini 3.8 Flash | Step 5 Preview |
|---|---|---|
| Task & likeness | 3.0/10 | 4.0/10 |
| Anatomy & construction | 2.0/10 | 4.0/10 |
| Space & placement | 3.5/10 | 4.0/10 |
| Light & reflections | 3.0/10 | 3.5/10 |
| Purposeful detail | 5.0/10 | 4.0/10 |
| Artistry & character | 3.0/10 | 4.0/10 |
| Materials & effects | 5.0/10 | 3.0/10 |
| Visual integrity | 1.0/10 | 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.


Gemini 3.8 Flash
A vivid purple-and-gold sunset anchors an appealing beach composition with dolphins, birds, a turtle and playful accessories. Palm silhouettes frame the bright reflection effectively. Sparse animal anatomy, wirelike palm foliage, conspicuously regular reflection bands and limited surface texture keep the execution below exceptional.
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 | Gemini 3.8 Flash | Step 5 Preview |
|---|---|---|
| Task & likeness | 9.0/10 | 4.0/10 |
| Anatomy & construction | 7.0/10 | 3.0/10 |
| Space & placement | 7.0/10 | 3.5/10 |
| Light & reflections | 8.0/10 | 3.5/10 |
| Purposeful detail | 7.0/10 | 3.0/10 |
| Artistry & character | 7.0/10 | 3.0/10 |
| Materials & effects | 7.0/10 | 3.5/10 |
| Visual integrity | 8.0/10 | 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.


Gemini 3.8 Flash
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.


Gemini 3.8 Flash
Expressive animals, a bold diagonal hull and sweeping spray create an appealing action scene. The raccoon's support on the dog's back is unclear, and the dog lacks a readable paw-to-control grip and connected steering assembly. Clean graphic shapes and lively accessories are stronger than the anatomical construction. Sunset illumination and reflections remain largely decorative.
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 | Gemini 3.8 Flash | Step 5 Preview |
|---|---|---|
| Task & likeness | 7.0/10 | 4.0/10 |
| Anatomy & construction | 6.0/10 | 4.5/10 |
| Space & placement | 7.0/10 | 3.0/10 |
| Light & reflections | 6.5/10 | 3.5/10 |
| Purposeful detail | 7.5/10 | 4.0/10 |
| Artistry & character | 7.5/10 | 3.5/10 |
| Materials & effects | 7.5/10 | 3.0/10 |
| Visual integrity | 7.5/10 | 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.


Gemini 3.8 Flash
The pelican’s enormous bill, lively feathers and orange bicycle create a clear, appealing composition. Basket contents, spokes and facial details reward inspection. Both legs connect to the body, but foot-to-pedal placement and wing-to-handlebar contact are ambiguous. Bicycle mechanics and lighting remain schematic, limiting an otherwise polished illustration.
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 | Gemini 3.8 Flash | Step 5 Preview |
|---|---|---|
| Task & likeness | 9.0/10 | 3.0/10 |
| Anatomy & construction | 7.5/10 | 3.0/10 |
| Space & placement | 7.5/10 | 3.0/10 |
| Light & reflections | 7.0/10 | 3.0/10 |
| Purposeful detail | 8.5/10 | 4.0/10 |
| Artistry & character | 8.0/10 | 3.0/10 |
| Materials & effects | 7.0/10 | 3.0/10 |
| Visual integrity | 8.0/10 | 2.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.