STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Qwen3.8-Max-0902 vs Step 5 Preview

Qwen3.8-Max-0902 leads Step 5 Preview by 24.3 points on StealthMark, 63.3 to 39.0. It leads on all 9 benchmarks. Qwen3.8-Max-0902 scores higher on Beach, with its largest category advantage in anatomy & construction.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

63.3/100Overall rank 6/53
39.0/100Overall rank 36/53

General Intelligence

62.7/100
37.1/100

Visual Intelligence

64.5/100
41.9/100

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

BENCHMARK BY BENCHMARK

Where each model leads

  • Qwen3.8-Max-0902
  • Step 5 Preview
  • Other models
  • Median

DATASHEET

Specs and pricing

Both take about 1M tokens of context.

  • Qwen3.8-Max-0902
  • Step 5 Preview
  • Other models
  • Median
PricePer 1M output tokens, input below
Qwen3.8-Max-0902: $4.95$1.65 inputStep 5 Preview: No list price
Context windowTokens per request, max output below
Qwen3.8-Max-0902: 1MTied128K max outputStep 5 Preview: 1MTied
Output speedTokens per second, our measurement
Qwen3.8-Max-0902: 76tokens/sStep 5 Preview: Not measured
SizeTotal and active parameters
Qwen3.8-Max-0902: 2.4T95B activeEstimatedStep 5 Preview: 600B27B active
Developer
Qwen / Alibaba CloudStepFun
Released
2 Sep 2026Not published
Origin
ChinaNot published
Input → output
Text, image → textText, image, video → text
Architecture
Mixture-of-Experts; hosted version based on the open Qwen3.8-2.4T-A95BSparse mixture-of-experts; 92 layers (88 MoE), 352 routed experts with 8 selected per token plus a shared expert; grouped-query attention with 512-token sliding windows and full attention every fourth layer; 3 multi-token-prediction layers; vision tower for image and video input

Full datasheets, every price and sourceQwen3.8-Max-0902 ↗Step 5 Preview ↗

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.

Qwen3.8-Max-0902 72.4/100Rank 4/49

Survived 2 of 3
Foresight: complete playing field
Level 316 ptsTurn 20 / 20

Step 5 Preview 59.9/100Rank 42/491 of 3 levels

1 of 3 played
Foresight: complete playing field
Level 122 ptsTurn 28 / 28

Points per level

LevelQwen3.8-Max-0902Step 5 Preview
Level 1Second Thoughts
27 ptsSurvived
22 ptsSurvived
Level 2Pressure Pot
12 ptsOut of lives
Pending
Level 3Hide or Flight
16 ptsSurvived
Pending

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.

Qwen3.8-Max-0902 82.6/100Rank 6/50

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

Step 5 Preview 40.7/100Rank 28/50

Cleared 4 of 5
Latch: complete playing field
Level 515 ptsTurn 35 / 40

Points per level

LevelQwen3.8-Max-0902Step 5 Preview
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9 ptsCleared
Level 3Relay vault
19.2 ptsCleared
18.6 ptsCleared
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
15.6 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20.6 ptsCleared
15 ptsFinished early

Newton's Mirror

Same task instructions

Physics, perspective and recursive reflections, tested together. Explore the test ↗

The judgment

Qwen3.8-Max-0902

The central sphere and differentiated cyan/crimson interaction are supported. The tiny highlighted object above the sphere provides partial airborne-black evidence. The few isolated sphere and panel images preserve limited optical relationships, but most of the repeating mirror-room structure is missing. Core score: 64.5/170; including the floor-damage reward: 64.5/180.

Step 5 Preview

The main sphere, airborne black and small colored features occupy broadly appropriate positions. Most of the defining mirror system is absent, and paint interaction remains only partially supported. The small paint features do not visibly establish a separate volume-scale violation.

Score breakdown

CategoryQwen3.8-Max-0902Step 5 Preview
State at 600 ms23.0/2520.0/25
Camera and placement12.0/1513.5/15
Reflections29.0/12020.0/120
Materials and scale8.0/107.0/10
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

Qwen3.8-Max-0902

A coherent ornamental illustration with balanced framing, appealing color and legible magical accessories. The disconnected raised wrist, incorrect raised-arm side and palm orientation, bear-like facial proportions and shallow material modeling limit execution. Clean decoration and compact spatial balance remain strengths.

Step 5 Preview

A charming diagonal climber and warm palette communicate the central idea. Simple rounded construction, crowded limb counting, uncertain footholds and an unattached upper shelf limit its physical coherence. Growth bands and the yarn trail add specificity, but the requested material distinctions and unravelled bootie remain underdeveloped.

Score breakdown

CategoryQwen3.8-Max-0902Step 5 Preview
Task & likeness7.5/106.0/10
Anatomy & construction6.5/104.5/10
Space & placement8.0/105.0/10
Light & reflections7.0/105.5/10
Purposeful detail7.5/105.5/10
Artistry & character7.0/105.0/10
Materials & effects7.5/106.0/10
Visual integrity6.5/105.0/10

Benchmark task

Qwen3.8-Max-0902

A floating capybara in ornate robes tests character anatomy, layered fabric and the placement of surrounding luminous forms.

Step 5 Preview

Character scenes test expression, anatomy, materials and coherent visual construction.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Qwen3.8-Max-0902

A recognizable, cohesive Mona Lisa interpretation with readable landscape layers and a restrained expression. Continuous body construction and clean contours support readability, but broad hands, simplified drapery, frontal symmetry and limited facial volume keep the execution basic and uneven.

Step 5 Preview

A recognizable, coherent simplification with purposeful facial contours and differentiated fingers. These provide more construction and detail than the broad silhouette alone suggests. The oversized face, frontal seated pose, unresolved wrists and sparse landscape still substantially limit likeness, depth and finish.

Score breakdown

CategoryQwen3.8-Max-0902Step 5 Preview
Task & likeness4.5/104.0/10
Anatomy & construction3.5/104.0/10
Space & placement5.0/104.0/10
Light & reflections5.0/103.5/10
Purposeful detail5.0/104.0/10
Artistry & character5.0/104.0/10
Materials & effects3.5/103.0/10
Visual integrity5.0/103.5/10

Benchmark task

An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.

Beach

Same task instructions

Creativity, perspective and visual beauty.

The judgment

Qwen3.8-Max-0902

A strong stylized beach illustration with coherent sunset color, lively dolphin arcs and balanced activity. Clean contours, readable ground contact and an aligned reflection support the finish. Schematic anatomy, sparse small-subject features, flat materials and repetitive water highlights limit physical depth and refinement.

Step 5 Preview

A recognizable sunset beach with clear warm-cool contrast and playful accessories. Basic animal construction, shallow foreground placement and schematic reflections limit spatial and physical credibility. Sparse descriptive detail and abruptly ended sky bands constrain the finish.

Score breakdown

CategoryQwen3.8-Max-0902Step 5 Preview
Task & likeness8.5/104.0/10
Anatomy & construction7.5/103.0/10
Space & placement7.5/103.5/10
Light & reflections8.0/103.5/10
Purposeful detail7.0/103.0/10
Artistry & character8.0/103.0/10
Materials & effects6.5/103.5/10
Visual integrity8.5/104.0/10

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

Ground Truth

Same task instructions

Physical reasoning, light and visual reconstruction.

The judgment

Qwen3.8-Max-0902

This benchmark has not been assessed yet.

Step 5 Preview

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

Same task instructions

Scene composition and interacting subjects.

The judgment

Qwen3.8-Max-0902

The riding arrangement and steering action are readable, supported by coherent visible attachments and useful character details. Clean shapes, strong color separation and clustered foam make the scene appealing and active. Stiff anatomy, crowded controls, limited directional lighting and simple surface treatments constrain sophistication.

Step 5 Preview

Recognizable animals, a bright palette and identifying accessories support a basic cartoon. Primitive anatomy, partial seated support, unresolved steering and weak hull-water contact limit the central action. Lighting and spray provide atmosphere without establishing convincing physical depth.

Score breakdown

CategoryQwen3.8-Max-0902Step 5 Preview
Task & likeness8.0/104.0/10
Anatomy & construction7.0/104.5/10
Space & placement7.0/103.0/10
Light & reflections6.5/103.5/10
Purposeful detail7.0/104.0/10
Artistry & character6.5/103.5/10
Materials & effects6.0/103.0/10
Visual integrity7.5/103.0/10

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

Same task instructions

Subject construction and spatial relationships.

The judgment

Qwen3.8-Max-0902

An appealing graphic illustration with a recognizable pelican, readable bicycle and clean coastal composition. Steering contact and one connected pedal support the action. Ambiguous neck-to-torso construction, an unclear opposing pedal connection, shallow space and limited material and lighting effects constrain its execution.

Step 5 Preview

The pelican and bicycle are recognizable, with a pleasant palette and basic diffuse shading. The riding relationship fails physically: the bird is unsupported, the front wheel is unmounted, and pedalling is unresolved. Simple geometric construction and sparse material treatment further limit the drawing.

Score breakdown

CategoryQwen3.8-Max-0902Step 5 Preview
Task & likeness8.5/103.0/10
Anatomy & construction6.5/103.0/10
Space & placement7.0/103.0/10
Light & reflections6.0/103.0/10
Purposeful detail7.5/104.0/10
Artistry & character7.5/103.0/10
Materials & effects6.0/103.0/10
Visual integrity8.0/102.0/10

Benchmark task

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