STEALTHMARK · HEAD TO HEAD

All comparisons ↗

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

MiMo-V2.6-Pro leads Beam 1.0 501B A23B by 16.0 points on StealthMark, 47.9 to 31.9. It leads on all 9 benchmarks. MiMo-V2.6-Pro 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
47.9/100Overall rank 21/53

General Intelligence

30.9/100
44.3/100

Visual Intelligence

33.8/100
54.3/100

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-Pro
  • Other models
  • Median

DATASHEET

Specs and pricing

Beam 1.0 501B A23B runs 8.4× faster in our speed test. MiMo-V2.6-Pro scores higher on StealthMark and is 15% cheaper per output token. Both take about 1M tokens of context.

  • Beam 1.0 501B A23B
  • MiMo-V2.6-Pro
  • Other models
  • Median
PricePer 1M output tokens, input below
Beam 1.0 501B A23B: $1$0.25 inputMiMo-V2.6-Pro: $0.8715% cheaper$0.43 input
Context windowTokens per request, max output below
Beam 1.0 501B A23B: 1MTied128K max outputMiMo-V2.6-Pro: 1MTied128K max output
Output speedTokens per second, our measurement
Beam 1.0 501B A23B: 9728.4× fastertokens/sMiMo-V2.6-Pro: 116tokens/s
SizeTotal and active parameters
Beam 1.0 501B A23B: 501B23.4B activeMiMo-V2.6-Pro: 1.02T42B 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 attentionSparse Mixture-of-Experts; OpenRouter maps the route to the released Pro-RL checkpoint. The UltraSpeed edition is a separate route

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

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-Pro 54.6/100Rank 13/47

Survived 1 of 3
Foresight: complete playing field
Level 319 ptsTurn 20 / 20

Points per level

LevelBeam 1.0 501B A23BMiMo-V2.6-Pro
Level 1Second Thoughts
18 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
9 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
19 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

MiMo-V2.6-Pro 52.6/100Rank 22/48

Cleared 5 of 5
Latch: complete playing field
Level 520.4 ptsTurn 28 / 40

Points per level

LevelBeam 1.0 501B A23BMiMo-V2.6-Pro
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
9 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
11.2 ptsFinished early
17.2 ptsClearedFinished early · 1 beacon left
Level 4Passing bay
3.6 ptsFinished early
16 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
5 ptsFinished early
20.4 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.

MiMo-V2.6-Pro

The main framing and visible paint-contact story are well supported. Major optical omissions dominate the result: sparse repetitions, undersized first images, missing outer chains and absent curved nested imagery prevent a coherent mirror-room system. The metallic forms remain convincing in volume but have a soft illustrative finish.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Pro
State at 600 ms20.5/2523.0/25
Camera and placement11.5/1512.0/15
Reflections2.0/12019.0/120
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.

MiMo-V2.6-Pro

An appealing rabbit with balanced framing, expressive eyes and purposeful costume accents. Simple frontal construction limits anatomical and spatial accomplishment. The orange orb provides an effective luminous focal point, but unreadable wrist connections weaken the requested gestures and prevent stronger integrity credit.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Pro
Task & likeness4.0/106.5/10
Anatomy & construction3.5/105.0/10
Space & placement5.5/105.5/10
Light & reflections5.5/106.5/10
Purposeful detail4.5/106.5/10
Artistry & character4.0/105.0/10
Materials & effects4.5/106.5/10
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.

MiMo-V2.6-Pro

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-Pro

The portrait is recognizable through its dark silhouette, slight smile and muted landscape, but replication is weak. A frontal, oversized head and symmetric torso replace the reference's turned seated pose; angular, separated hands omit its central gesture. Smooth shading maintains coherence while anatomical detail, depth and material rendering remain basic.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Pro
Task & likeness0.0/103.5/10
Anatomy & construction0.0/103.5/10
Space & placement0.0/104.0/10
Light & reflections0.5/105.0/10
Purposeful detail0.0/103.0/10
Artistry & character0.0/104.0/10
Materials & effects0.0/104.0/10
Visual integrity0.0/106.0/10

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.

MiMo-V2.6-Pro

A readable sunset beach with clear requested subjects, appealing framing and purposeful accessories. Schematic anatomy, flattened foreground objects, repetitive water highlights and sparse directional shadows limit construction and physical depth. The kite's unresolved anchor also constrains integrity.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Pro
Task & likeness7.0/108.5/10
Anatomy & construction5.0/105.0/10
Space & placement6.0/106.0/10
Light & reflections5.0/106.5/10
Purposeful detail5.5/106.5/10
Artistry & character4.0/105.0/10
Materials & effects5.0/106.0/10
Visual integrity5.0/106.0/10

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-Pro

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-Pro

A coherent, cheerful cartoon with recognizable animals, readable steering contact and useful small details. The dog's orientation follows the craft more successfully than a wholly frontal pose would. Simple anatomy, weak raccoon grip and compressed seating contacts still limit physical credibility. Gradients and spray provide polish without resolving complex construction.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Pro
Task & likeness5.0/107.0/10
Anatomy & construction3.5/105.0/10
Space & placement5.5/105.5/10
Light & reflections4.0/105.5/10
Purposeful detail6.5/106.0/10
Artistry & character3.5/104.0/10
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.

MiMo-V2.6-Pro

The distinctive bill, continuous silhouette and detailed wheels establish a readable pelican cyclist. Shaped feathers and soft shading add character, but jointless legs, crowded pedal contacts, absent steering contact and loosely directional lighting limit the construction. The comparisons support retaining the baseline category scores.

Score breakdown

CategoryBeam 1.0 501B A23BMiMo-V2.6-Pro
Task & likeness5.5/106.5/10
Anatomy & construction4.5/105.0/10
Space & placement5.0/106.0/10
Light & reflections4.0/105.5/10
Purposeful detail4.0/106.0/10
Artistry & character4.0/106.0/10
Materials & effects4.0/105.5/10
Visual integrity5.5/106.0/10

Benchmark task

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