Beam 1.0 501B A23B 49.4/100Rank 18/47

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Callstack Apex leads Beam 1.0 501B A23B by 17.6 points on StealthMark, 49.5 to 31.9. It leads on 7 of the 8 benchmarks with results for both and Beam 1.0 501B A23B on 1, including Latch. Pixel Canary 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
Beam 1.0 501B A23B is 3× cheaper per output token, takes 4× more context and runs 3.8× faster in our speed test. Callstack Apex scores higher on StealthMark.
Full datasheets, every price and sourceBeam 1.0 501B A23B ↗Callstack Apex ↗
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 ↗


Beam 1.0 501B A23B
Central object placement is fairly close, but the defining mirrored-room structure is missing. The paint colors suggest the required contact order without establishing their different interaction histories. The faint floor oval does not demonstrate valid reflection geometry, so it earns no reflection credit. Rounded volume and glossy paint provide limited material credit despite weak metallic finishes and oversized paint bodies.
Callstack Apex
The principal sphere placement and paint contact sequence are supported. Isolated sphere and panel images provide limited optical structure, but missing lateral chains and side-floor continuations prevent a coherent repeating mirror room. The main and reflected spheres lack ordered curved nested imagery, while sparse planar emitter images and incomplete spherical emitter mapping leave most of the reflection system unsupported.
| Category | Beam 1.0 501B A23B | Callstack Apex |
|---|---|---|
| State at 600 ms | 20.5/25 | 20.0/25 |
| Camera and placement | 11.5/15 | 13.0/15 |
| Reflections | 2.0/120 | 10.0/120 |
| Materials and scale | 3.0/10 | 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.


Beam 1.0 501B A23B
An appealing expression and warm palette support a coherent simple cartoon. The central polishing joke is not legible: the cloth is unresolved and the nose sits away from the fan. Pointed radial plates, uncertain limb attachments and weak ground contact limit construction, while restrained surface detail limits material richness.
Callstack Apex
The cheerful yellow bird, cream eyes, orange features and miniature teal console closely match the brief. Clean block edges, restrained colors and soft shadows create an appealing composition. The body reads more like a gridded disc than a fully cubic sphere, and the outlined left wing has limited volume. The right wing reaches the cyan block, though its grip is ambiguous.
| Category | Beam 1.0 501B A23B | Callstack Apex |
|---|---|---|
| Task & likeness | 4.0/10 | 8.5/10 |
| Anatomy & construction | 3.5/10 | 7.0/10 |
| Space & placement | 5.5/10 | 7.5/10 |
| Light & reflections | 5.5/10 | 7.5/10 |
| Purposeful detail | 4.5/10 | 7.5/10 |
| Artistry & character | 4.0/10 | 7.0/10 |
| Materials & effects | 4.5/10 | 7.0/10 |
| Visual integrity | 7.0/10 | 7.5/10 |
Beam 1.0 501B A23B
A golden pangolin polishes its oversized amber tail while its nose smudges the same scale. The scene tests expressive anatomy, physical contact and contrasting translucent, polished and soft materials.
Callstack Apex
A rounded bird built from small cubes explores a miniature machine. The scene tests block construction, expressive proportions, contact and soft lighting.
Precise visual recall and portrait reconstruction.


Beam 1.0 501B A23B
The candidate shows a faint warm oval against an almost entirely black field. Minimal placement and smooth tonal variation are visible, but the portrait, anatomy, crossed hands and landscape remain unreadable. The saved comparisons provide no specific evidence supporting a change to the baseline categories.
Callstack Apex
The framed portrait recalls Mona Lisa through dark hair, folded arms and a hazy landscape. Replication is limited by wide, staring eyes, an elongated neck and a downturned mouth. The overlapping hands lack convincing finger and wrist construction. Soft tonal shading suggests volume, but pervasive blur obscures clothing, landscape and anatomical detail.
| Category | Beam 1.0 501B A23B | Callstack Apex |
|---|---|---|
| Task & likeness | 0.0/10 | 3.5/10 |
| Anatomy & construction | 0.0/10 | 4.0/10 |
| Space & placement | 0.0/10 | 4.5/10 |
| Light & reflections | 0.5/10 | 6.0/10 |
| Purposeful detail | 0.0/10 | 4.5/10 |
| Artistry & character | 0.0/10 | 4.5/10 |
| Materials & effects | 0.0/10 | 5.5/10 |
| Visual integrity | 0.0/10 | 5.5/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Beam 1.0 501B A23B
A coherent, cheerful beach illustration fulfills the main subjects with clean shapes and a strong sunset focal point. Its basic geometric construction, ambiguous animal anatomy, shallow depth and schematic lighting limit its accomplishment. Decorative details provide interest without developing intricate forms or convincing physical surfaces.
Callstack Apex
A cohesive sunset beach illustration with lively wildlife, playful accents, and an appealing warm-to-purple palette. Palm framing and the aligned sun reflection organize the scene, while connected silhouettes keep the activities readable. Schematic joints, ambiguous dolphin junctions, loosely matched reflections, and repetitive surface marks limit construction, lighting coherence, and material depth.
| Category | Beam 1.0 501B A23B | Callstack Apex |
|---|---|---|
| Task & likeness | 7.0/10 | 8.5/10 |
| Anatomy & construction | 5.0/10 | 4.5/10 |
| Space & placement | 6.0/10 | 7.5/10 |
| Light & reflections | 5.0/10 | 5.5/10 |
| Purposeful detail | 5.5/10 | 7.5/10 |
| Artistry & character | 4.0/10 | 6.5/10 |
| Materials & effects | 5.0/10 | 7.0/10 |
| Visual integrity | 5.0/10 | 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.


Beam 1.0 501B A23B
This benchmark has not been assessed yet.
Callstack Apex
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.


Beam 1.0 501B A23B
A cheerful, readable illustration with recognizable animals, expressive faces and useful accessories. Simple rounded construction limits complexity, while ambiguous steering attachments and weak hull-to-water contact reduce physical coherence. Lighting and surface effects establish the setting without convincing environmental interaction.
Callstack Apex
The raccoon clearly rides the dog's back, and the dog's paws reach the jet ski controls. Expressive faces, a sweeping tail and a strong sunset composition give the illustration character. Limbs remain connected, but the dog's foreleg joints and vehicle seating are loosely constructed. Angular splashes convey speed more successfully than convincing water displacement; lighting and reflections remain decorative.
| Category | Beam 1.0 501B A23B | Callstack Apex |
|---|---|---|
| Task & likeness | 5.0/10 | 9.0/10 |
| Anatomy & construction | 3.5/10 | 7.0/10 |
| Space & placement | 5.5/10 | 7.5/10 |
| Light & reflections | 4.0/10 | 7.0/10 |
| Purposeful detail | 6.5/10 | 8.5/10 |
| Artistry & character | 3.5/10 | 7.5/10 |
| Materials & effects | 5.0/10 | 7.0/10 |
| Visual integrity | 6.5/10 | 8.0/10 |
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.

Beam 1.0 501B A23B
A cheerful, clearly readable pelican-and-bicycle illustration with clean contours and balanced composition. Simple geometric construction limits artistic complexity, while ambiguous neck and steering overlaps, merged pedal contacts and an incomplete drivetrain weaken physical coherence.
Callstack Apex
An appealing cartoon with a distinctive pelican, expressive eye, warm bill and carefully drawn bicycle wheels. The wing reaches the handlebar, but the feet do not clearly engage the pedals, weakening the riding mechanics. Layered hills create depth; limited ground shadows weaken contact. Clean curves and purposeful feather details give the illustration polish.
| Category | Beam 1.0 501B A23B | Callstack Apex |
|---|---|---|
| Task & likeness | 5.5/10 | 8.5/10 |
| Anatomy & construction | 4.5/10 | 6.5/10 |
| Space & placement | 5.0/10 | 7.5/10 |
| Light & reflections | 4.0/10 | 7.5/10 |
| Purposeful detail | 4.0/10 | 8.0/10 |
| Artistry & character | 4.0/10 | 8.0/10 |
| Materials & effects | 4.0/10 | 7.5/10 |
| Visual integrity | 5.5/10 | 8.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.