STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Beam 1.0 501B A23B vs MAI-Thinking-1

Beam 1.0 501B A23B leads MAI-Thinking-1 by 17.8 points on StealthMark, 31.9 to 14.1. It leads on 6 of 9 benchmarks, including both games, and MAI-Thinking-1 on 3. 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 ↗
All results ↗

Overall StealthMark

31.9/100Overall rank 42/53
14.1/100Overall rank 51/53

General Intelligence

30.9/100
7.4/100

Visual Intelligence

33.8/100
24.6/100

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

  • MAI-Thinking-1Single-step reasoning not measured

Open or local

Open modelApache 2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Beam 1.0 501B A23B
  • MAI-Thinking-1
  • Other models
  • Median

DATASHEET

Specs and pricing

Beam 1.0 501B A23B scores higher on StealthMark, is 8× cheaper per output token, takes 4.1× more context and runs 10× faster in our speed test.

  • Beam 1.0 501B A23B
  • MAI-Thinking-1
  • Other models
  • Median
PricePer 1M output tokens, input below
Beam 1.0 501B A23B: $18× cheaper$0.25 inputMAI-Thinking-1: $8$2 input
Context windowTokens per request, max output below
Beam 1.0 501B A23B: 1M4.1× larger128K max outputMAI-Thinking-1: 256K64K max outputEstimated
Output speedTokens per second, our measurement
Beam 1.0 501B A23B: 97210× fastertokens/sMAI-Thinking-1: 93tokens/s
SizeTotal and active parameters
Beam 1.0 501B A23B: 501B23.4B activeMAI-Thinking-1: 1T35B activeEstimated
Developer
Reflection AIMicrosoft AI
Released
16 Oct 202612 Aug 2026
Origin
United StatesBoth
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 attentionSparse Mixture-of-Experts (MoE)

Full datasheets, every price and sourceBeam 1.0 501B A23B ↗MAI-Thinking-1 ↗

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

MAI-Thinking-1 6.4/100Rank 44/47

Survived 0 of 3
Foresight: complete playing field
Level 31 ptsTurn 8 / 20

Points per level

LevelBeam 1.0 501B A23BMAI-Thinking-1
Level 1Second Thoughts
18 ptsOut of lives
3 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
3 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
1 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

MAI-Thinking-1 3.6/100Rank 44/48

Cleared 1 of 5
Latch: complete playing field
Level 511.8 ptsTurn 16 / 40

Points per level

LevelBeam 1.0 501B A23BMAI-Thinking-1
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
2 ptsOut of turns
Level 3Relay vault
11.2 ptsFinished early
2.2 ptsFinished early
Level 4Passing bay
3.6 ptsFinished early
3 ptsFinished early
Level 5Second thoughts
5 ptsFinished early
11.8 ptsFinished early

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.

MAI-Thinking-1

The small paint features and convex shading deserve moderate material credit. The sphere remains undersized and low, with black unusually close to its apex. Crimson and cyan do not establish the required impact histories. Faint reflected echoes supply limited optical evidence, while the defining recursive room, nested sphere and emitter structures remain unestablished.

Score breakdown

CategoryBeam 1.0 501B A23BMAI-Thinking-1
State at 600 ms20.5/253.0/25
Camera and placement11.5/152.5/15
Reflections2.0/1204.0/120
Materials and scale3.0/102.0/10
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.

MAI-Thinking-1

A recognizable lantern-and-moth illustration with appealing coloured wings and tidy outer contours. Simple construction, a small focal subject and crowded overlaps limit character and depth. The face, six-leg anatomy, seedling and antenna-driven watering joke remain insufficiently readable.

Score breakdown

CategoryBeam 1.0 501B A23BMAI-Thinking-1
Task & likeness4.0/104.0/10
Anatomy & construction3.5/104.5/10
Space & placement5.5/105.0/10
Light & reflections5.5/104.5/10
Purposeful detail4.5/104.0/10
Artistry & character4.0/105.0/10
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.

MAI-Thinking-1

A fluffy moth tends a lantern greenhouse amid a gardening mishap. The scene tests insect anatomy, expressive action, translucent wings and the interaction of light with small objects.

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.

MAI-Thinking-1

A recognizable Mona Lisa motif emerges from dark hair, a pale face and a landscape band. Replication remains weak: the oversized frontal head, broad smile, unresolved torso and missing crossed-hand anatomy diverge substantially from the reference. Simple fills and sparse strokes provide limited volume, material definition or painterly complexity.

Score breakdown

CategoryBeam 1.0 501B A23BMAI-Thinking-1
Task & likeness0.0/101.0/10
Anatomy & construction0.0/100.5/10
Space & placement0.0/101.0/10
Light & reflections0.5/101.5/10
Purposeful detail0.0/101.0/10
Artistry & character0.0/101.5/10
Materials & effects0.0/100.5/10
Visual integrity0.0/103.0/10

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.

MAI-Thinking-1

A coherent, cheerful beach scene with balanced placement, clean shapes and controlled sunset colours. Animals, birds and playful accessories are recognizable, but basic dolphin construction, weak grounding, schematic reflections and sparse material detail limit the drawing's accomplishment.

Score breakdown

CategoryBeam 1.0 501B A23BMAI-Thinking-1
Task & likeness7.0/106.0/10
Anatomy & construction5.0/104.0/10
Space & placement6.0/105.0/10
Light & reflections5.0/104.0/10
Purposeful detail5.5/104.5/10
Artistry & character4.0/104.0/10
Materials & effects5.0/103.5/10
Visual integrity5.0/104.5/10

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.

MAI-Thinking-1

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.

MAI-Thinking-1

The recognizable raccoon and clean, shaded forms make a readable cartoon. The dog's steering remains undemonstrated, while ambiguous seating contacts and a minimally constructed craft weaken the central interaction. Controlled gradients and edges deserve credit, but anatomy, purposeful detail and water displacement remain basic.

Score breakdown

CategoryBeam 1.0 501B A23BMAI-Thinking-1
Task & likeness5.0/103.0/10
Anatomy & construction3.5/102.0/10
Space & placement5.5/105.0/10
Light & reflections4.0/103.5/10
Purposeful detail6.5/103.0/10
Artistry & character3.5/102.5/10
Materials & effects5.0/103.5/10
Visual integrity6.5/105.5/10

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.

MAI-Thinking-1

A recognizable pelican and bicycle combine clean rounded forms, expressive facial details and effective surface shading. Aligned wheels and soft shadows establish placement, but unresolved pedal engagement, absent steering contact and sparse drivetrain construction weaken the riding action. Limited feather complexity and shallow space constrain an otherwise appealing illustration.

Score breakdown

CategoryBeam 1.0 501B A23BMAI-Thinking-1
Task & likeness5.5/107.0/10
Anatomy & construction4.5/104.5/10
Space & placement5.0/105.5/10
Light & reflections4.0/107.0/10
Purposeful detail4.0/105.0/10
Artistry & character4.0/105.0/10
Materials & effects4.0/104.5/10
Visual integrity5.5/107.0/10

Benchmark task

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