STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Beam 1.0 501B A23B vs Claude Haiku 5.5

Claude Haiku 5.5 leads Beam 1.0 501B A23B by 17.6 points on StealthMark, 49.5 to 31.9. It leads on 7 of 9 benchmarks, including Latch, and Beam 1.0 501B A23B on 2, including Foresight. Claude Haiku 5.5 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
49.5/100Overall rank 17/53

General Intelligence

30.9/100
47.6/100

Visual Intelligence

33.8/100
52.8/100

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

  • Claude Haiku 5.5

Open or local

Open modelApache 2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Beam 1.0 501B A23B
  • Claude Haiku 5.5
  • Other models
  • Median

DATASHEET

Specs and pricing

Beam 1.0 501B A23B runs 2.4× faster in our speed test. Claude Haiku 5.5 scores higher on StealthMark and is 2× cheaper per output token. Both take about 1M tokens of context.

  • Beam 1.0 501B A23B
  • Claude Haiku 5.5
  • Other models
  • Median
PricePer 1M output tokens, input below
Beam 1.0 501B A23B: $1$0.25 inputClaude Haiku 5.5: $0.502× cheaper$0.10 input
Context windowTokens per request, max output below
Beam 1.0 501B A23B: 1MTied128K max outputClaude Haiku 5.5: 1MTied128K max output
Output speedTokens per second, our measurement
Beam 1.0 501B A23B: 9722.4× fastertokens/sClaude Haiku 5.5: 402tokens/s
SizeTotal and active parameters
Beam 1.0 501B A23B: 501B23.4B activeClaude Haiku 5.5: Not disclosed
Developer
Reflection AIAnthropic
Released
16 Oct 20267 Oct 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 ↗Claude Haiku 5.5 ↗

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

Claude Haiku 5.5 34.4/100Rank 25/47

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

Points per level

LevelBeam 1.0 501B A23BClaude Haiku 5.5
Level 1Second Thoughts
18 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
7 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
9 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

Claude Haiku 5.5 78.3/100Rank 10/48

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

Points per level

LevelBeam 1.0 501B A23BClaude Haiku 5.5
Level 1Hold the door
5.2 ptsCleared
5 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
9.8 ptsCleared
Level 3Relay vault
11.2 ptsFinished early
18.8 ptsCleared
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.

Claude Haiku 5.5

The centered sphere, compact airborne black blob and differentiated cyan/crimson interaction support substantial state and placement credit. The few recognizable sphere and panel images establish limited optical relationships, but most of the required mirror system is missing. Rounded volume and localized paint warrant substantial material credit despite the soft, illustrative finish.

Score breakdown

CategoryBeam 1.0 501B A23BClaude Haiku 5.5
State at 600 ms20.5/2525.0/25
Camera and placement11.5/158.0/15
Reflections2.0/12024.5/120
Materials and scale3.0/107.5/10
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.

Claude Haiku 5.5

A coherent coral squid emblem with a compact mantle, restrained face and clean centered presentation. Its radial silhouette and floating placement work, but sharp arm tips, crowded roots and sparse surface modeling limit softness, construction and finish.

Score breakdown

CategoryBeam 1.0 501B A23BClaude Haiku 5.5
Task & likeness4.0/106.5/10
Anatomy & construction3.5/104.0/10
Space & placement5.5/106.5/10
Light & reflections5.5/104.0/10
Purposeful detail4.5/103.5/10
Artistry & character4.0/103.5/10
Materials & effects4.5/104.5/10
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.

Claude Haiku 5.5

A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.

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.

Claude Haiku 5.5

A recognizable but basic Mona Lisa reinterpretation. Clean contours and smooth facial lighting provide coherence and volume. Replication remains limited by the frontal pose, elongated neck, schematic expression, unresolved crossed hands and sparse landscape. Lighting is more successful than anatomical construction and purposeful detail.

Score breakdown

CategoryBeam 1.0 501B A23BClaude Haiku 5.5
Task & likeness0.0/103.0/10
Anatomy & construction0.0/104.0/10
Space & placement0.0/104.0/10
Light & reflections0.5/105.5/10
Purposeful detail0.0/102.5/10
Artistry & character0.0/103.5/10
Materials & effects0.0/102.5/10
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.

Claude Haiku 5.5

A cheerful, coherent beach illustration with attractive sunset colors, readable accessories and clean silhouettes. Its sun and sailboat reflections establish useful physical relationships. Simple animal construction, flattened foreground placement, sparse directional shadows and minimally differentiated surfaces limit its drawing refinement.

Score breakdown

CategoryBeam 1.0 501B A23BClaude Haiku 5.5
Task & likeness7.0/108.5/10
Anatomy & construction5.0/106.5/10
Space & placement6.0/107.0/10
Light & reflections5.0/107.0/10
Purposeful detail5.5/107.0/10
Artistry & character4.0/106.0/10
Materials & effects5.0/106.0/10
Visual integrity5.0/108.5/10

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.

Claude Haiku 5.5

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.

Claude Haiku 5.5

A tidy, appealing cartoon with recognizable animals and a pleasing sunset palette. Steering lacks visible controls, while schematic limbs and uncertain raccoon support weaken the requested interaction. Shallow vehicle construction, flat character lighting and modest displacement limit physical coherence. Clean shapes and readable identifying details remain strengths.

Score breakdown

CategoryBeam 1.0 501B A23BClaude Haiku 5.5
Task & likeness5.0/104.0/10
Anatomy & construction3.5/103.5/10
Space & placement5.5/105.5/10
Light & reflections4.0/104.0/10
Purposeful detail6.5/105.5/10
Artistry & character3.5/104.5/10
Materials & effects5.0/105.5/10
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.

Claude Haiku 5.5

A cheerful, recognizable illustration with clean contours and a balanced warm palette. Aligned wheels and readable frame geometry establish the bicycle, but shoulder construction, feet and steering contact remain imprecise. Sparse drivetrain detail, flat materials and absent grounding shadows limit anatomical and spatial conviction.

Score breakdown

CategoryBeam 1.0 501B A23BClaude Haiku 5.5
Task & likeness5.5/108.0/10
Anatomy & construction4.5/105.5/10
Space & placement5.0/106.5/10
Light & reflections4.0/105.0/10
Purposeful detail4.0/106.0/10
Artistry & character4.0/105.0/10
Materials & effects4.0/105.0/10
Visual integrity5.5/108.0/10

Benchmark task

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