STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Beam 1.0 501B A23B vs Fledge Alpha

Fledge Alpha leads Beam 1.0 501B A23B by 3.9 points on StealthMark, 35.8 to 31.9. It leads on 5 of the 7 benchmarks with results for both and Beam 1.0 501B A23B on 2. Beam 1.0 501B A23B scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

See the difference ↘
All results ↗
Model guide ↗

Overall StealthMark

31.9/100Overall rank 42/53
35.8/100Overall rank 38/53

General Intelligence

30.9/100
27.1/100

Visual Intelligence

33.8/100
45.2/100

Reasoning efficiency

On every task, result quality and reasoning tokens are each compared with all measured models and weighed equally. Each dot is one model.

Single-step reasoning Result quality weighed against reasoning tokens on a single problem

Multi-step reasoning Result quality weighed against reasoning tokens across connected steps, as in agentic workflows

  • Fledge AlphaMulti-step reasoning not measured

Open or local

Open modelApache 2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Beam 1.0 501B A23B
  • Fledge Alpha
  • Other models
  • Median

DATASHEET

Specs and pricing

Beam 1.0 501B A23B runs 16× faster in our speed test. Fledge Alpha scores higher on StealthMark.

  • Beam 1.0 501B A23B
  • Fledge Alpha
  • Other models
  • Median
PricePer 1M output tokens, input below
Beam 1.0 501B A23B: $1$0.25 inputFledge Alpha: No list price
Context windowTokens per request, max output below
Beam 1.0 501B A23B: 1M128K max outputFledge Alpha: Not published
Output speedTokens per second, our measurement
Beam 1.0 501B A23B: 97216× fastertokens/sFledge Alpha: 63tokens/s
SizeTotal and active parameters
Beam 1.0 501B A23B: 501B23.4B activeFledge Alpha: Not disclosed
Developer
Reflection AINot published
Released
16 Oct 2026Not published
Origin
United StatesNot published
Input → output
Text → textNot published
Architecture
Sparse mixture-of-experts transformer; 52 layers (3 dense, 49 MoE), 256 experts with 8 selected per token; gated GQA and sliding-window attentionNot published

Full datasheets, every price and sourceBeam 1.0 501B A23B ↗

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.

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

Survived 1 of 3
Foresight: complete playing field
Level 39 ptsTurn 20 / 20

Points per level

LevelBeam 1.0 501B A23BFledge Alpha
Level 1Second Thoughts
18 ptsOut of lives
No run
Level 2Pressure Pot
9 ptsOut of lives
No run
Level 3Hide or Flight
9 ptsSurvived
No run

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.

Beam 1.0 501B A23B 37.3/100Rank 29/48

Cleared 2 of 5
Latch: complete playing field
Level 55 ptsTurn 30 / 40

Points per level

LevelBeam 1.0 501B A23BFledge Alpha
Level 1Hold the door
5.2 ptsCleared
No run
Level 2Crossfeed
9.6 ptsCleared
No run
Level 3Relay vault
11.2 ptsFinished early
No run
Level 4Passing bay
3.6 ptsFinished early
No run
Level 5Second thoughts
5 ptsFinished early
No run

Newton's Mirror

Same task instructions

Physics, perspective and recursive reflections, tested together. Explore the test ↗

The judgment

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.

Fledge Alpha

The candidate communicates a round metallic sphere, three paint colors and a separate airborne black blob. Its hovering support relationship, displaced framing and unresolved paint interaction limit physical credit. Sparse planar light ghosts and a soft sphere highlight provide little evidence for the required wall/floor repetitions and curved nested mirror imagery.

Score breakdown

CategoryBeam 1.0 501B A23BFledge Alpha
State at 600 ms20.5/259.0/25
Camera and placement11.5/155.0/15
Reflections2.0/1207.5/120
Materials and scale3.0/103.5/10
Floor-damage reward0.0/100.0/10

Benchmark task

A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.

Selfie

Different task instructions

Visual construction and creative interpretation.

The judgment

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.

Fledge Alpha

A coherent, appealing mascot with expressive eyes, a cheerful beak and a readable swept-back silhouette. Its larger forward foot and trailing feathers suggest a running stride, but the upright body, stiff legs and minimally articulated feet limit convincing motion. Clean flat shapes suit the brief, while uneven feather junctions and incomplete cream accents reduce polish.

Score breakdown

CategoryBeam 1.0 501B A23BFledge Alpha
Task & likeness4.0/107.5/10
Anatomy & construction3.5/106.5/10
Space & placement5.5/107.0/10
Light & reflections5.5/105.5/10
Purposeful detail4.5/106.5/10
Artistry & character4.0/104.0/10
Materials & effects4.5/106.0/10
Visual integrity7.0/106.5/10

Benchmark task

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.

Fledge Alpha

An eager young seabird running toward the viewer tests expressive anatomy, balance and a convincing forward-moving pose.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

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.

Fledge Alpha

A recognizable but basic Mona Lisa reinterpretation with a coherent silhouette and subdued palette. Curtain-like hair obscures much of the face, while elongated facial construction and oversized, minimally articulated hands substantially weaken replication. Soft shading supplies modest volume, but anatomy, landscape depth and purposeful detail remain underdeveloped.

Score breakdown

CategoryBeam 1.0 501B A23BFledge Alpha
Task & likeness0.0/103.0/10
Anatomy & construction0.0/103.0/10
Space & placement0.0/102.5/10
Light & reflections0.5/102.5/10
Purposeful detail0.0/103.0/10
Artistry & character0.0/103.0/10
Materials & effects0.0/102.5/10
Visual integrity0.0/102.5/10

Benchmark task

An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.

Beach

Different task instructions

Creativity, perspective and visual beauty.

The judgment

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.

Fledge Alpha

A cheerful, recognizable sunset beach with a cohesive warm palette and clear accessories. Simple construction, uncertain palm support, an ambiguous upper boundary and schematic reflections limit depth and finish. The scene communicates its subject successfully but lacks the developed forms, lighting and detail of exceptional illustration.

Score breakdown

CategoryBeam 1.0 501B A23BFledge Alpha
Task & likeness7.0/107.5/10
Anatomy & construction5.0/104.0/10
Space & placement6.0/105.5/10
Light & reflections5.0/105.0/10
Purposeful detail5.5/103.0/10
Artistry & character4.0/103.0/10
Materials & effects5.0/102.5/10
Visual integrity5.0/104.0/10

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

Ground Truth

Different task instructions

Physical reasoning, light and visual reconstruction.

The judgment

Beam 1.0 501B A23B

This benchmark has not been assessed yet.

Fledge Alpha

This benchmark has not been assessed yet.

Benchmark task

A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.

Raccoon

Different task instructions

Scene composition and interacting subjects.

The judgment

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.

Fledge Alpha

An appealing sunset illustration with recognizable characters and a clear riding action. Color, expression and silhouette are stronger than anatomical construction: overlapping paws obscure support, the dog's steering limb is simplified, and the vehicle controls lack definition. The wake conveys movement, while lighting and water reflections remain decorative.

Score breakdown

CategoryBeam 1.0 501B A23BFledge Alpha
Task & likeness5.0/108.5/10
Anatomy & construction3.5/105.5/10
Space & placement5.5/107.5/10
Light & reflections4.0/106.5/10
Purposeful detail6.5/107.0/10
Artistry & character3.5/105.5/10
Materials & effects5.0/107.0/10
Visual integrity6.5/104.5/10

Benchmark task

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.

Pelican

Different task instructions

Subject construction and spatial relationships.

The judgment

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.

Fledge Alpha

A clear, cheerful illustration with a recognizable pelican, coherent bicycle silhouette and tidy composition. Simplified leg articulation, steering contact, mechanical detail and lighting keep it at a competent illustrative level.

Score breakdown

CategoryBeam 1.0 501B A23BFledge Alpha
Task & likeness5.5/108.0/10
Anatomy & construction4.5/106.0/10
Space & placement5.0/106.5/10
Light & reflections4.0/104.5/10
Purposeful detail4.0/105.5/10
Artistry & character4.0/105.0/10
Materials & effects4.0/105.5/10
Visual integrity5.5/106.5/10

Benchmark task

A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.