STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Beam 1.0 501B A23B vs MiMo-V2.6-Flash

MiMo-V2.6-Flash leads Beam 1.0 501B A23B by 12.7 points on StealthMark, 44.6 to 31.9. It leads on 7 of 9 benchmarks, including Latch, and Beam 1.0 501B A23B on 2, including Foresight. 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
44.6/100Overall rank 28/53

General Intelligence

30.9/100
41.0/100

Visual Intelligence

33.8/100
49.8/100

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

Open or local

Open modelApache 2.0
Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • Beam 1.0 501B A23B
  • MiMo-V2.6-Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

Beam 1.0 501B A23B runs 1.8× faster in our speed test. MiMo-V2.6-Flash scores higher on StealthMark and is 3.6× cheaper per output token. Both take about 1M tokens of context.

  • Beam 1.0 501B A23B
  • MiMo-V2.6-Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
Beam 1.0 501B A23B: $1$0.25 inputMiMo-V2.6-Flash: $0.283.6× cheaper$0.14 input
Context windowTokens per request, max output below
Beam 1.0 501B A23B: 1MTied128K max outputMiMo-V2.6-Flash: 1MTied128K max output
Output speedTokens per second, our measurement
Beam 1.0 501B A23B: 9721.8× fastertokens/sMiMo-V2.6-Flash: 547tokens/s
SizeTotal and active parameters
Beam 1.0 501B A23B: 501B23.4B activeMiMo-V2.6-Flash: 309B15B active
Developer
Reflection AIXiaomi
Released
16 Oct 202621 Sep 2026
Origin
United StatesChina
Input → output
Text → textText, image, video, audio → 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 attentionReleased Flash-RL checkpoint: sparse Mixture-of-Experts; hosted Flash and MOPD variants are distinct artifacts

Full datasheets, every price and sourceBeam 1.0 501B A23B ↗MiMo-V2.6-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

MiMo-V2.6-Flash 71.3/100Rank 36/471 of 3 levels

1 of 3 played
Foresight: complete playing field
Level 212 ptsTurn 14 / 18

Points per level

LevelBeam 1.0 501B A23BMiMo-V2.6-Flash
Level 1Second Thoughts
18 ptsOut of lives
Pending
Level 2Pressure Pot
9 ptsOut of lives
12 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
Not played

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

MiMo-V2.6-Flash 66.3/100Rank 27/483 of 5 levels

3 of 5 played
Latch: complete playing field
Level 318 ptsTurn 36 / 36

Points per level

LevelBeam 1.0 501B A23BMiMo-V2.6-Flash
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
9.6 ptsCleared
Level 3Relay vault
11.2 ptsFinished early
18 ptsCleared
Level 4Passing bay
3.6 ptsFinished early
Pending
Level 5Second thoughts
5 ptsFinished early
Not played

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.

MiMo-V2.6-Flash

The faint lower sphere image provides limited reflection evidence through reversed paint-color ordering. The wider reflection system and nested room imagery are absent. The colored beads do not resolve the required impact and transport history, while displaced paint positions and weak material rendering further limit the result.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Flash
State at 600 ms20.5/255.0/25
Camera and placement11.5/154.5/15
Reflections2.0/1206.5/120
Materials and scale3.0/102.5/10
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.

MiMo-V2.6-Flash

The centered rabbit has an appealing alert expression, a balanced silhouette, and a restrained technological palette. Outfit panels and orbital accents are cleanly resolved. The orb-holding paw has an ambiguous grip, the ears lack distinct angular bends, and the halo's interlocking construction is unclear. Soft shading suggests volume, but materials and spatial depth remain simplified.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Flash
Task & likeness4.0/108.0/10
Anatomy & construction3.5/106.5/10
Space & placement5.5/107.0/10
Light & reflections5.5/107.0/10
Purposeful detail4.5/106.0/10
Artistry & character4.0/105.5/10
Materials & effects4.5/106.5/10
Visual integrity7.0/108.0/10

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.

MiMo-V2.6-Flash

A small rabbit in an explorer outfit floats with a luminous orb. The scene tests character anatomy, pose and the placement of geometric forms around it.

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.

MiMo-V2.6-Flash

The dark clothing, long hair, folded hands and hazy landscape make the reference recognizable. Replication is limited by the frontal symmetry, elongated face, wide staring eyes and downturned mouth. Both arms connect to the hands, but the overlapping palms and looplike fingers are poorly resolved. Soft facial shading provides some volume; the clothing and landscape remain broad, simplified shapes.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Flash
Task & likeness0.0/103.0/10
Anatomy & construction0.0/102.5/10
Space & placement0.0/104.0/10
Light & reflections0.5/103.0/10
Purposeful detail0.0/104.0/10
Artistry & character0.0/102.5/10
Materials & effects0.0/103.5/10
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.

MiMo-V2.6-Flash

The warm sunset, aligned reflection, framing palms and playful beach animals create an appealing, coherent scene. Small toys and shells remain readable. Drawing is simplified: animals have limited volume, water uses repetitive horizontal strokes, and foreground shadows do not consistently follow the central sun. Clean execution supports a competent illustration, but depth and material rendering remain modest.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Flash
Task & likeness7.0/107.5/10
Anatomy & construction5.0/106.5/10
Space & placement6.0/107.0/10
Light & reflections5.0/106.0/10
Purposeful detail5.5/107.0/10
Artistry & character4.0/106.0/10
Materials & effects5.0/106.0/10
Visual integrity5.0/108.0/10

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.

MiMo-V2.6-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.

MiMo-V2.6-Flash

The raccoon riding the dog reads clearly, with expressive faces and a cheerful waterscape. The steering action is weak: no paw reaches the handlebar, which meets the dog's muzzle. The vehicle resembles a thin board with a steering post. Overlapping limbs obscure anatomy, while limited shadows, reflections and surface modeling keep the scene flat.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Flash
Task & likeness5.0/106.5/10
Anatomy & construction3.5/104.0/10
Space & placement5.5/106.5/10
Light & reflections4.0/104.5/10
Purposeful detail6.5/105.5/10
Artistry & character3.5/104.0/10
Materials & effects5.0/105.5/10
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.

MiMo-V2.6-Flash

The pelican is immediately recognizable, with an expressive eye and prominent pouch, and the landscape provides clear framing. Clean outlines and spokes support the cheerful illustration. Both feet visibly miss the bicycle's pedal mechanism, weakening the riding action. Simplified machinery, shallow depth and loosely directional shading limit the requested masterpiece quality.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Flash
Task & likeness5.5/108.0/10
Anatomy & construction4.5/105.5/10
Space & placement5.0/107.0/10
Light & reflections4.0/106.0/10
Purposeful detail4.0/107.0/10
Artistry & character4.0/106.5/10
Materials & effects4.0/105.5/10
Visual integrity5.5/107.5/10

Benchmark task

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