STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Beam 1.0 501B A23B vs DeepSeek-V4.1-Flash

DeepSeek-V4.1-Flash leads Beam 1.0 501B A23B by 18.1 points on StealthMark, 50.0 to 31.9. It leads on all 9 benchmarks. DeepSeek-V4.1-Flash scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

31.9/100Overall rank 42/53
50.0/100Overall rank 16/53

General Intelligence

30.9/100
48.5/100

Visual Intelligence

33.8/100
53.0/100

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

Open or local

Open modelApache 2.0
Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • Beam 1.0 501B A23B
  • DeepSeek-V4.1-Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

Beam 1.0 501B A23B is 13% cheaper per output token and runs 4× faster in our speed test. DeepSeek-V4.1-Flash scores higher on StealthMark. Both take about 1M tokens of context.

  • Beam 1.0 501B A23B
  • DeepSeek-V4.1-Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
Beam 1.0 501B A23B: $113% cheaper$0.25 inputDeepSeek-V4.1-Flash: $1.13$0.28 input
Context windowTokens per request, max output below
Beam 1.0 501B A23B: 1MTied128K max outputDeepSeek-V4.1-Flash: 1MTied384K max output
Output speedTokens per second, our measurement
Beam 1.0 501B A23B: 9724× fastertokens/sDeepSeek-V4.1-Flash: 242tokens/s
SizeTotal and active parameters
Beam 1.0 501B A23B: 501B23.4B activeDeepSeek-V4.1-Flash: 763B16B active
Developer
Reflection AIDeepSeek-AI
Released
16 Oct 202610 Sep 2026
Origin
United StatesChina
Input → output
Text → textText, image → text
Architecture
Sparse mixture-of-experts transformer; 52 layers (3 dense, 49 MoE), 256 experts with 8 selected per token; gated GQA and sliding-window attention20-layer encoder + 20-layer decoder with CSA2, Single-Pass mHC, Engram n-gram memory and DSpark/MTP

Full datasheets, every price and sourceBeam 1.0 501B A23B ↗DeepSeek-V4.1-Flash ↗

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

DeepSeek-V4.1-Flash 55.4/100Rank 12/47

Survived 1 of 3
Foresight: complete playing field
Level 318 ptsTurn 20 / 20

Points per level

LevelBeam 1.0 501B A23BDeepSeek-V4.1-Flash
Level 1Second Thoughts
18 ptsOut of lives
16 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
7 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
18 ptsSurvived

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

DeepSeek-V4.1-Flash 65.2/100Rank 19/48

Cleared 5 of 5
Latch: complete playing field
Level 520.6 ptsTurn 27 / 40

Points per level

LevelBeam 1.0 501B A23BDeepSeek-V4.1-Flash
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
9 ptsCleared
Level 3Relay vault
11.2 ptsFinished early
17.2 ptsClearedFinished early · 3 beacons left
Level 4Passing bay
3.6 ptsFinished early
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
5 ptsFinished early
20.6 ptsCleared

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.

DeepSeek-V4.1-Flash

The first wall and floor images provide limited reflection geometry, but the room's mirror recurrence is substantially incomplete, particularly the outer-edge chains and lateral sightlines. The main sphere and its large reflected images lack ordered, curved room and virtual-sphere imagery. Repeated emitter mapping is missing from both planar mirrors and spherical surfaces.

Score breakdown

CategoryBeam 1.0 501B A23BDeepSeek-V4.1-Flash
State at 600 ms20.5/2523.5/25
Camera and placement11.5/1513.5/15
Reflections2.0/12030.0/120
Materials and scale3.0/108.0/10
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.

DeepSeek-V4.1-Flash

Expressive faces, cobalt coloring and a flowing diagonal composition make the mutual inspection charming. Execution is uneven: the long pointed flipper lacks a convincing grip, the enlarged shrimp face appears detached from its body, and the large lens is oval. Flat anatomical shading and an unexplained purple ringed patch beneath the whale weaken the requested polished depth.

Score breakdown

CategoryBeam 1.0 501B A23BDeepSeek-V4.1-Flash
Task & likeness4.0/107.0/10
Anatomy & construction3.5/106.5/10
Space & placement5.5/106.5/10
Light & reflections5.5/106.0/10
Purposeful detail4.5/107.0/10
Artistry & character4.0/107.5/10
Materials & effects4.5/107.0/10
Visual integrity7.0/107.0/10

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.

DeepSeek-V4.1-Flash

A whale and a tiny shrimp examine one another through bubble lenses, with an octopus nearby. The scene tests interacting characters, differences in scale and transparent materials.

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.

DeepSeek-V4.1-Flash

The centered portrait, dark hair, crossed hands and muted landscape make the reference recognizable. Replication is limited by the frontal pose, staring eyes and weakly defined smile. Hands are overlapping oval masses with almost no finger articulation, while wrists disappear into sleeves. Soft gradients suggest volume, but broad, indistinct surfaces and faint stray lines leave the drawing basic and uneven.

Score breakdown

CategoryBeam 1.0 501B A23BDeepSeek-V4.1-Flash
Task & likeness0.0/103.5/10
Anatomy & construction0.0/103.0/10
Space & placement0.0/104.5/10
Light & reflections0.5/104.5/10
Purposeful detail0.0/103.0/10
Artistry & character0.0/104.0/10
Materials & effects0.0/103.0/10
Visual integrity0.0/105.5/10

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.

DeepSeek-V4.1-Flash

The glowing sunset, silhouetted palm and playful foreground create a coherent, appealing beach illustration. Birds, crab, boat and reflections fulfill the brief. The airborne animals have weakly defined anatomy and little convincing splash interaction. Broad, blurred reflections and largely flat surfaces limit depth and finish.

Score breakdown

CategoryBeam 1.0 501B A23BDeepSeek-V4.1-Flash
Task & likeness7.0/108.0/10
Anatomy & construction5.0/105.5/10
Space & placement6.0/106.5/10
Light & reflections5.0/106.5/10
Purposeful detail5.5/105.5/10
Artistry & character4.0/105.0/10
Materials & effects5.0/106.0/10
Visual integrity5.0/105.5/10

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.

DeepSeek-V4.1-Flash

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.

DeepSeek-V4.1-Flash

The sunset palette and silhouetted grouping establish an appealing scene. A masked rider sits above a pointed-eared dog, but merged body shapes leave limbs and support unresolved. The boatlike craft lacks readable steering controls, so the requested action is unclear. Sparse facial marks and glowing spray dots offer limited detail.

Score breakdown

CategoryBeam 1.0 501B A23BDeepSeek-V4.1-Flash
Task & likeness5.0/105.0/10
Anatomy & construction3.5/104.0/10
Space & placement5.5/105.5/10
Light & reflections4.0/106.0/10
Purposeful detail6.5/103.5/10
Artistry & character3.5/104.0/10
Materials & effects5.0/105.0/10
Visual integrity6.5/106.0/10

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.

DeepSeek-V4.1-Flash

A recognizable pelican rides a brightly colored bicycle against a striking sunset. The sweeping bill, trailing scarf and circular wheels create a controlled composition. Both legs connect, but pedal linkage, body support and the wing's handlebar grip remain loosely resolved. Clean vector shapes and feather details work well; simplified shading limits volume and integration with the sunset light.

Score breakdown

CategoryBeam 1.0 501B A23BDeepSeek-V4.1-Flash
Task & likeness5.5/108.5/10
Anatomy & construction4.5/107.0/10
Space & placement5.0/107.5/10
Light & reflections4.0/107.0/10
Purposeful detail4.0/106.5/10
Artistry & character4.0/108.0/10
Materials & effects4.0/107.0/10
Visual integrity5.5/108.0/10

Benchmark task

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