STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Beam 1.0 501B A23B vs GPT-5.6 Luna

GPT-5.6 Luna leads Beam 1.0 501B A23B by 5.9 points on StealthMark, 37.8 to 31.9. It leads on 7 of 9 benchmarks, including Latch, and Beam 1.0 501B A23B on 2, including Foresight. GPT-5.6 Luna scores higher on Newton's Mirror, with its largest category advantage in materials and scale.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

31.9/100Overall rank 42/53
37.8/100Overall rank 37/53

General Intelligence

30.9/100
30.4/100

Visual Intelligence

33.8/100
50.2/100

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

  • GPT-5.6 Luna

Open or local

Open modelApache 2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Beam 1.0 501B A23B
  • GPT-5.6 Luna
  • Other models
  • Median

DATASHEET

Specs and pricing

Beam 1.0 501B A23B is 20% cheaper per output token and runs 5.4× faster in our speed test. GPT-5.6 Luna scores higher on StealthMark. Both take about 1M tokens of context.

  • Beam 1.0 501B A23B
  • GPT-5.6 Luna
  • Other models
  • Median
PricePer 1M output tokens, input below
Beam 1.0 501B A23B: $120% cheaper$0.25 inputGPT-5.6 Luna: $1.20$0.20 input
Context windowTokens per request, max output below
Beam 1.0 501B A23B: 1MTied128K max outputGPT-5.6 Luna: 1.05MTied128K max output
Output speedTokens per second, our measurement
Beam 1.0 501B A23B: 9725.4× fastertokens/sGPT-5.6 Luna: 181tokens/s
SizeTotal and active parameters
Beam 1.0 501B A23B: 501B23.4B activeGPT-5.6 Luna: Not disclosed
Developer
Reflection AIOpenAI
Released
16 Oct 20269 Jul 2026
Origin
United StatesBoth
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 attentionNot published

Full datasheets, every price and sourceBeam 1.0 501B A23B ↗GPT-5.6 Luna ↗

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

GPT-5.6 Luna 25.1/100Rank 35/47

Survived 0 of 3
Foresight: complete playing field
Level 38 ptsTurn 15 / 20

Points per level

LevelBeam 1.0 501B A23BGPT-5.6 Luna
Level 1Second Thoughts
18 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
6 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
8 ptsOut of lives

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

GPT-5.6 Luna 52.9/100Rank 21/48

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

Points per level

LevelBeam 1.0 501B A23BGPT-5.6 Luna
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
8.6 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
11.2 ptsFinished early
18 ptsCleared
Level 4Passing bay
3.6 ptsFinished early
17 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.

GPT-5.6 Luna

The room enclosure has coherent symmetric perspective, with the overhead panel, sphere and black aligned centrally. The sphere and airborne black occupy substantially lower positions than the reference framing, inconsistent with the prescribed camera aim. The diagonal crimson streak does not establish the required surface transport. Faint wall sphere images provide limited mirrored correspondence, but the shallow floor image, missing receding chains, absent nested sphere imagery and sparse emitter mapping leave most reflection structure unsupported.

Score breakdown

CategoryBeam 1.0 501B A23BGPT-5.6 Luna
State at 600 ms20.5/2515.0/25
Camera and placement11.5/154.0/15
Reflections2.0/1203.5/120
Materials and scale3.0/106.5/10
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.

GPT-5.6 Luna

Six pale, outward-facing heads and six rounded lobes make the knot recognizable. The central hexagonal opening remains clear. However, broad gray crossing panels flatten the weave, several inner joins resemble capped strips, and sparse oversized scale marks leave the bodies looking more like decorated ribbons than living snakes.

Score breakdown

CategoryBeam 1.0 501B A23BGPT-5.6 Luna
Task & likeness4.0/107.5/10
Anatomy & construction3.5/106.0/10
Space & placement5.5/106.5/10
Light & reflections5.5/105.0/10
Purposeful detail4.5/105.5/10
Artistry & character4.0/106.0/10
Materials & effects4.5/105.0/10
Visual integrity7.0/106.0/10

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.

GPT-5.6 Luna

A pale serpent woven into an interlocking knot tests connected anatomy, repeated structure and readable overlaps. Organic surface detail must work with the overall geometry.

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.

GPT-5.6 Luna

The central portrait, dark clothing, crossed hands and muted landscape clearly evoke Mona Lisa. Replication is limited by the elongated face, conspicuous eyes and simplified smile. Overlapping fingers have uncertain anatomy, while broad gradients and heavy outlines flatten the portrait. The composition and restrained palette remain coherent.

Score breakdown

CategoryBeam 1.0 501B A23BGPT-5.6 Luna
Task & likeness0.0/103.5/10
Anatomy & construction0.0/103.5/10
Space & placement0.0/104.0/10
Light & reflections0.5/104.5/10
Purposeful detail0.0/104.0/10
Artistry & character0.0/104.0/10
Materials & effects0.0/103.5/10
Visual integrity0.0/104.5/10

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.

GPT-5.6 Luna

The warm sunset, palm silhouette and varied beach activities create an appealing, readable composition. Animals, birds and a broad sun reflection satisfy the brief. Drawing remains elementary: angular airborne sea animals lack splash or convincing motion, the crab's claws are awkwardly constructed, and repeated reflection bands suggest a stepped platform. Clean outlines and pleasant colors exceed the anatomical and spatial sophistication.

Score breakdown

CategoryBeam 1.0 501B A23BGPT-5.6 Luna
Task & likeness7.0/107.5/10
Anatomy & construction5.0/104.0/10
Space & placement6.0/105.5/10
Light & reflections5.0/104.0/10
Purposeful detail5.5/106.5/10
Artistry & character4.0/103.5/10
Materials & effects5.0/104.0/10
Visual integrity5.0/103.5/10

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.

GPT-5.6 Luna

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.

GPT-5.6 Luna

Expressive animals, a striped tail and clean outlines make the scene appealing and readable. The raccoon sits convincingly on the dog's back, but the overlapping steering paws are ambiguous and the control stem stops above the hull. Broad wake shapes suggest motion; the glowing sun lacks a corresponding water reflection.

Score breakdown

CategoryBeam 1.0 501B A23BGPT-5.6 Luna
Task & likeness5.0/107.0/10
Anatomy & construction3.5/105.0/10
Space & placement5.5/106.5/10
Light & reflections4.0/106.0/10
Purposeful detail6.5/106.5/10
Artistry & character3.5/104.5/10
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.

GPT-5.6 Luna

A recognizable pelican cyclist with an expressive profile, balanced composition and controlled outlines. Head, neck and torso connect coherently. The bicycle wheels and frame are convincing, but overlapping feet obscure pedal contact, the drivetrain lacks a clear chain, and the wing's handlebar grip is schematic. Atmospheric color succeeds more strongly than directional lighting or material depth.

Score breakdown

CategoryBeam 1.0 501B A23BGPT-5.6 Luna
Task & likeness5.5/108.5/10
Anatomy & construction4.5/105.5/10
Space & placement5.0/107.5/10
Light & reflections4.0/106.5/10
Purposeful detail4.0/106.5/10
Artistry & character4.0/105.5/10
Materials & effects4.0/107.0/10
Visual integrity5.5/106.5/10

Benchmark task

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