STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Beam 1.0 501B A23B vs LongCat-2.0

Beam 1.0 501B A23B leads LongCat-2.0 by 6.4 points on StealthMark, 31.9 to 25.5. LongCat-2.0 leads on 5 of the 7 benchmarks with results for both and Beam 1.0 501B A23B on 2. Owl Alpha scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
Model guide ↗

Overall StealthMark

31.9/100Overall rank 42/53
25.5/100Overall rank 45/53

General Intelligence

30.9/100
17.2/100

Visual Intelligence

33.8/100
34.4/100

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

  • LongCat-2.0Multi-step reasoning not measured

Open or local

Open modelApache 2.0
Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • Beam 1.0 501B A23B
  • LongCat-2.0
  • Other models
  • Median

DATASHEET

Specs and pricing

Beam 1.0 501B A23B scores higher on StealthMark, is 20% cheaper per output token and runs 11× faster in our speed test. Both take about 1M tokens of context.

  • Beam 1.0 501B A23B
  • LongCat-2.0
  • Other models
  • Median
PricePer 1M output tokens, input below
Beam 1.0 501B A23B: $120% cheaper$0.25 inputLongCat-2.0: $1.20$0.30 input
Context windowTokens per request, max output below
Beam 1.0 501B A23B: 1MTied128K max outputLongCat-2.0: 1MTied
Output speedTokens per second, our measurement
Beam 1.0 501B A23B: 97211× fastertokens/sLongCat-2.0: 86tokens/s
SizeTotal and active parameters
Beam 1.0 501B A23B: 501B23.4B activeLongCat-2.0: Not disclosed
Developer
Reflection AIMeituan
Released
16 Oct 2026Not published
Origin
United StatesChina
Input → output
Text → textBoth
Architecture
Sparse mixture-of-experts transformer; 52 layers (3 dense, 49 MoE), 256 experts with 8 selected per token; gated GQA and sliding-window attentionMixture-of-Experts with LongCat Sparse Attention

Full datasheets, every price and sourceBeam 1.0 501B A23B ↗LongCat-2.0 ↗

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 A23BLongCat-2.0
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 A23BLongCat-2.0
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.

LongCat-2.0

Cyan lies on the sphere's facing middle rather than showing its recent interaction near the apex. Separate airborne black and elongated crimson support part of the timing sequence. Small side images and an overlapping lower image provide limited reflection ordering, but recursive room structure, nested imagery and emitter mappings are largely absent. The main sphere is smaller and higher in the frame than prescribed, and the surfaces have a soft, matte appearance.

Score breakdown

CategoryBeam 1.0 501B A23BLongCat-2.0
State at 600 ms20.5/259.5/25
Camera and placement11.5/156.5/15
Reflections2.0/12012.5/120
Materials and scale3.0/105.5/10
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.

LongCat-2.0

Amber slit eyes, a pointed beak, cream feathers and gold-trimmed black clothing establish the secretive owl rogue. The head appears frontal rather than lowered, with much of the face exposed. The centered silhouette is effective, but stiff cloak geometry, shallow facial modeling and extremely dark clothing limit depth and finish. Sparse gold markings suggest the requested circuitry only loosely.

Score breakdown

CategoryBeam 1.0 501B A23BLongCat-2.0
Task & likeness4.0/107.0/10
Anatomy & construction3.5/106.0/10
Space & placement5.5/106.0/10
Light & reflections5.5/105.5/10
Purposeful detail4.5/106.0/10
Artistry & character4.0/106.5/10
Materials & effects4.5/105.5/10
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.

LongCat-2.0

A cloaked owl with luminous eyes tests expression, fabric folds and the separation of dark forms.

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.

LongCat-2.0

The centered portrait, slight smile, overlapping hands and distant landscape suggest Mona Lisa, but replication is weak. The face has little volume, the shoulders and torso form a narrow wedge, and the hands are fingerless ovals with unresolved wrists. Broad gray background bands provide limited depth. A bright head rim and pale hands contrast with an almost featureless dark figure.

Score breakdown

CategoryBeam 1.0 501B A23BLongCat-2.0
Task & likeness0.0/100.5/10
Anatomy & construction0.0/100.5/10
Space & placement0.0/100.5/10
Light & reflections0.5/100.5/10
Purposeful detail0.0/100.0/10
Artistry & character0.0/100.5/10
Materials & effects0.0/100.0/10
Visual integrity0.0/100.5/10

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.

LongCat-2.0

The sunset, palms, birds and beach animals create a cheerful, readable scene. Clean silhouettes and a vivid sky establish the composition, but construction remains schematic. The right palm appears rooted in open water, shadows have limited connection to the sunset, and the sun’s reflection consists of rigid bands. Small creatures and beach equipment are recognizable but minimally developed.

Score breakdown

CategoryBeam 1.0 501B A23BLongCat-2.0
Task & likeness7.0/107.5/10
Anatomy & construction5.0/105.5/10
Space & placement6.0/105.5/10
Light & reflections5.0/106.0/10
Purposeful detail5.5/105.0/10
Artistry & character4.0/105.0/10
Materials & effects5.0/103.0/10
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.

LongCat-2.0

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.

LongCat-2.0

The raccoon is recognizable and expressive, with a clear mask and striped tail. The dog's anatomy is poorly resolved, and the flattened craft lacks convincing steering and seating. Feet extend below the hull, weakening the sense of support. An appealing palette, clean shapes and decorative water effects give the illustration some polish.

Score breakdown

CategoryBeam 1.0 501B A23BLongCat-2.0
Task & likeness5.0/104.0/10
Anatomy & construction3.5/103.0/10
Space & placement5.5/104.5/10
Light & reflections4.0/105.5/10
Purposeful detail6.5/106.0/10
Artistry & character3.5/103.0/10
Materials & effects5.0/105.5/10
Visual integrity6.5/105.0/10

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.

LongCat-2.0

A clearly recognizable pelican cycles through a well-composed coastal sunset. Warm colors, flowing scarf, feather contours and bicycle details give the illustration character. The legs connect to the body, but the farther foot's pedal contact and the wing's handlebar grip remain ambiguous. Clean vector shapes provide polish, with limited material texture and directional shading.

Score breakdown

CategoryBeam 1.0 501B A23BLongCat-2.0
Task & likeness5.5/108.5/10
Anatomy & construction4.5/107.0/10
Space & placement5.0/108.0/10
Light & reflections4.0/107.5/10
Purposeful detail4.0/108.0/10
Artistry & character4.0/108.5/10
Materials & effects4.0/107.0/10
Visual integrity5.5/108.5/10

Benchmark task

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