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

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Claude Fable 5.1 leads Beam 1.0 501B A23B by 30.1 points on StealthMark, 62.0 to 31.9. It leads on 8 of 9 benchmarks, including Latch, and Beam 1.0 501B A23B on 1, including Foresight. Claude Fable 5.1 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 50× cheaper per output token and runs 8× faster in our speed test. Claude Fable 5.1 scores higher on StealthMark. Both take about 1M tokens of context.
Full datasheets, every price and sourceBeam 1.0 501B A23B ↗Claude Fable 5.1 ↗
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.
Claude Fable 5.1
The broad paint sequence, bilateral near-field sphere arrangement, overlaps and diminishing panel repetitions are recognizable; crimson is slightly too low. Small paint scale and basic shading provide material cues, although the steel response remains soft. Inaccurate light projections, missing outer chains and incomplete nested room imagery remain the principal limitations.
| Category | Beam 1.0 501B A23B | Claude Fable 5.1 |
|---|---|---|
| State at 600 ms | 20.5/25 | 24.0/25 |
| Camera and placement | 11.5/15 | 14.0/15 |
| Reflections | 2.0/120 | 48.0/120 |
| Materials and scale | 3.0/10 | 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.


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.
Claude Fable 5.1
The coral palette, friendly face, matte shading and cream arch create a coherent emblem. However, the mantle is elongated rather than compact, and the appendages spread mostly sideways and downward instead of forming an evenly spaced, flower-like starburst. Two thin hanging appendages weaken the thick-arm motif. Clean contours and balanced framing support the simple design.
| Category | Beam 1.0 501B A23B | Claude Fable 5.1 |
|---|---|---|
| Task & likeness | 4.0/10 | 6.5/10 |
| Anatomy & construction | 3.5/10 | 7.0/10 |
| Space & placement | 5.5/10 | 7.5/10 |
| Light & reflections | 5.5/10 | 6.5/10 |
| Purposeful detail | 4.5/10 | 6.0/10 |
| Artistry & character | 4.0/10 | 7.0/10 |
| Materials & effects | 4.5/10 | 6.5/10 |
| Visual integrity | 7.0/10 | 8.0/10 |
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.
Claude Fable 5.1
A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.
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.
Claude Fable 5.1
The dark clothing, crossed hands and hazy landscape establish the Mona Lisa composition. Replication is limited by the frontal, elongated face, wide eyes and simplified smile. Rounded, parallel fingers and unclear wrist transitions weaken the hands. Warm facial shading gives some volume, but broad garment shapes and scattered crack marks substitute for convincing folds and painterly detail.
| Category | Beam 1.0 501B A23B | Claude Fable 5.1 |
|---|---|---|
| Task & likeness | 0.0/10 | 5.5/10 |
| Anatomy & construction | 0.0/10 | 6.0/10 |
| Space & placement | 0.0/10 | 6.0/10 |
| Light & reflections | 0.5/10 | 6.0/10 |
| Purposeful detail | 0.0/10 | 5.0/10 |
| Artistry & character | 0.0/10 | 5.5/10 |
| Materials & effects | 0.0/10 | 6.0/10 |
| Visual integrity | 0.0/10 | 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.


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.
Claude Fable 5.1
The colorful sunset, layered shoreline, animals, kite and beach toys fulfill the lively beach brief. Clean silhouettes and a balanced composition give the illustration character. Construction is simplified: the umbrella resembles a segmented fan, dolphins have weak water interaction, and the sun’s reflection forms a rigid widening wedge. Flat surfaces and sparse contact shadows limit depth.
| Category | Beam 1.0 501B A23B | Claude Fable 5.1 |
|---|---|---|
| Task & likeness | 7.0/10 | 8.5/10 |
| Anatomy & construction | 5.0/10 | 7.0/10 |
| Space & placement | 6.0/10 | 7.0/10 |
| Light & reflections | 5.0/10 | 7.0/10 |
| Purposeful detail | 5.5/10 | 7.5/10 |
| Artistry & character | 4.0/10 | 7.5/10 |
| Materials & effects | 5.0/10 | 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.


Beam 1.0 501B A23B
This benchmark has not been assessed yet.
Claude Fable 5.1
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.
Claude Fable 5.1
The raccoon rides on the dog's back, and the dog's extended foreleg reaches the jet ski controls. Expressive faces, a clear silhouette and sweeping spray make the action readable. Limb and handlebar overlaps weaken construction; broad shading provides limited volume, and the glowing sun has little corresponding reflection on the water. Clean vector shapes support an appealing but simplified illustration.
| Category | Beam 1.0 501B A23B | Claude Fable 5.1 |
|---|---|---|
| Task & likeness | 5.0/10 | 8.5/10 |
| Anatomy & construction | 3.5/10 | 6.5/10 |
| Space & placement | 5.5/10 | 7.0/10 |
| Light & reflections | 4.0/10 | 5.5/10 |
| Purposeful detail | 6.5/10 | 7.0/10 |
| Artistry & character | 3.5/10 | 7.0/10 |
| Materials & effects | 5.0/10 | 6.5/10 |
| Visual integrity | 6.5/10 | 7.5/10 |
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.
Claude Fable 5.1
The pelican reads clearly, with an expressive face, prominent bill and appealing composition. Both legs connect to the body, but the far foot's pedal contact and the wing's steering grip remain unclear. Wheel alignment and background layers are coherent. Clean contours and feather lines give polish, while schematic machinery, limited surface texture and weak directional lighting constrain the finish.
| Category | Beam 1.0 501B A23B | Claude Fable 5.1 |
|---|---|---|
| Task & likeness | 5.5/10 | 8.5/10 |
| Anatomy & construction | 4.5/10 | 7.0/10 |
| Space & placement | 5.0/10 | 7.5/10 |
| Light & reflections | 4.0/10 | 6.0/10 |
| Purposeful detail | 4.0/10 | 7.0/10 |
| Artistry & character | 4.0/10 | 7.0/10 |
| Materials & effects | 4.0/10 | 6.0/10 |
| Visual integrity | 5.5/10 | 8.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.