STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Qwen3.8-Flash vs Step 5 Preview

Qwen3.8-Flash leads Step 5 Preview by 7.6 points on StealthMark, 46.6 to 39.0. It leads on 8 of 9 benchmarks, including both games, and Step 5 Preview on 1. Qwen3.8-Flash scores higher on Beach, with its largest category advantage in anatomy & construction.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

46.6/100Overall rank 23/53
39.0/100Overall rank 36/53

General Intelligence

38.5/100
37.1/100

Visual Intelligence

60.3/100
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

Open or local

Local modelOpen model · Qwen Community 1.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Qwen3.8-Flash
  • Step 5 Preview
  • Other models
  • Median

DATASHEET

Specs and pricing

Both take about 1M tokens of context.

  • Qwen3.8-Flash
  • Step 5 Preview
  • Other models
  • Median
PricePer 1M output tokens, input below
Qwen3.8-Flash: $0.38$0.11 inputStep 5 Preview: No list price
Context windowTokens per request, max output below
Qwen3.8-Flash: 1MTied128K max outputStep 5 Preview: 1MTied
Output speedTokens per second, our measurement
Qwen3.8-Flash: 75tokens/sStep 5 Preview: Not measured
SizeTotal and active parameters
Qwen3.8-Flash: 180B6B activeEstimatedStep 5 Preview: 600B27B active
Developer
Qwen / Alibaba CloudStepFun
Released
26 Aug 2026Not published
Origin
ChinaNot published
Input → output
Text, image, video → textBoth
Architecture
Hosted Flash based on Flash-Next: sparse attention and n-gram memory; Flash-Next previews Qwen 4 architectureSparse 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-Flash ↗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-Flash 29.7/100Rank 33/49

Survived 1 of 3
Foresight: complete playing field
Level 35 ptsTurn 10 / 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-FlashStep 5 Preview
Level 1Second Thoughts
26 ptsSurvived
22 ptsSurvived
Level 2Pressure Pot
3 ptsOut of lives
Pending
Level 3Hide or Flight
5 ptsOut of lives
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-Flash 69.8/100Rank 18/50

Cleared 5 of 5
Latch: complete playing field
Level 520 ptsTurn 30 / 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-FlashStep 5 Preview
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9 ptsCleared
Level 3Relay vault
18.8 ptsCleared
18.6 ptsCleared
Level 4Passing bay
17.2 ptsClearedFinished early · 3 beacons left
15.6 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20 ptsCleared
15 ptsFinished early

Newton's Mirror

Same task instructions

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

The judgment

Qwen3.8-Flash

The full-frame illustration supports a central steel sphere, an airborne black blob and the relative ordering of cyan and crimson. Its faint floor return and symmetric repetitions provide sparse mirror structure; outer chains, large reflected images, nested imagery and emitter mapping remain deficient. Vertical framing is substantially displaced, and paint contact histories remain unresolved.

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-FlashStep 5 Preview
State at 600 ms19.0/2520.0/25
Camera and placement3.5/1513.5/15
Reflections9.5/12020.0/120
Materials and scale4.0/107.0/10
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-Flash

A coherent, appealing fantasy illustration with disciplined framing, luminous teal accents and consistent ornament. Most requested elements are clearly present. The bear-like facial proportions, lowered resting hand, obscured bent-leg construction and limited fabric modeling constrain likeness and anatomical clarity; glow effects are attractive but weakly integrated with surrounding surfaces.

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-FlashStep 5 Preview
Task & likeness8.0/106.0/10
Anatomy & construction7.0/104.5/10
Space & placement8.0/105.0/10
Light & reflections7.5/105.5/10
Purposeful detail8.0/105.5/10
Artistry & character7.5/105.0/10
Materials & effects7.5/106.0/10
Visual integrity8.5/105.0/10

Benchmark task

Qwen3.8-Flash

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-Flash

The dark dress, crossed hands and hazy landscape evoke the Mona Lisa, but replication is limited by a generic frontal face, coarse smile and poorly articulated fingers. The gold frame has clearer definition than the portrait. Heavy mottling obscures features, while soft shading provides some volume without convincing anatomical detail.

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-FlashStep 5 Preview
Task & likeness5.0/104.0/10
Anatomy & construction4.5/104.0/10
Space & placement5.5/104.0/10
Light & reflections5.5/103.5/10
Purposeful detail5.5/104.0/10
Artistry & character5.5/104.0/10
Materials & effects5.5/103.0/10
Visual integrity5.5/103.5/10

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-Flash

Sweeping palms, coordinated sunset colors and a central reflection create an expressive beach composition with clear depth. Birds, animals and varied activities thoroughly realize the brief. Small figures and animal anatomy remain rudimentary, water movement is schematic, and contact shadows are weak. Scattered foreground details and the clipped orange disk limit the finish.

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-FlashStep 5 Preview
Task & likeness9.0/104.0/10
Anatomy & construction7.0/103.0/10
Space & placement8.0/103.5/10
Light & reflections7.5/103.5/10
Purposeful detail8.5/103.0/10
Artistry & character8.0/103.0/10
Materials & effects6.5/103.5/10
Visual integrity7.0/104.0/10

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-Flash

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-Flash

The raccoon clearly rides the dog's back, with expressive features and appealing blue-orange color contrast. The dog's paws do not clearly operate connected controls, and the shallow vehicle lacks convincing jet ski construction. Clean outlines support the cartoon style, but generic shading and blurred water streaks limit depth and motion.

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-FlashStep 5 Preview
Task & likeness7.0/104.0/10
Anatomy & construction5.5/104.5/10
Space & placement6.5/103.0/10
Light & reflections5.5/103.5/10
Purposeful detail7.0/104.0/10
Artistry & character6.5/103.5/10
Materials & effects5.5/103.0/10
Visual integrity7.0/103.0/10

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-Flash

The pelican's expressive face, oversized bill and flowing scarf create an appealing focal point. The bicycle has recognizable frame, chain and wheel construction, but the far foot lacks a clear pedal connection and the wing's steering contact is ambiguous. Clean contours and gentle gradients support the illustration; simplified volume and weak directional shadows limit depth.

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-FlashStep 5 Preview
Task & likeness8.5/103.0/10
Anatomy & construction8.0/103.0/10
Space & placement7.5/103.0/10
Light & reflections6.5/103.0/10
Purposeful detail8.0/104.0/10
Artistry & character8.0/103.0/10
Materials & effects7.0/103.0/10
Visual integrity7.5/102.0/10

Benchmark task

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