STEALTHMARK · HEAD TO HEAD

All comparisons ↗

DeepSeek-V4.1-Flash-1017 vs Qwen3.5-9B

DeepSeek-V4.1-Flash-1017 leads Qwen3.5-9B by 48.7 points on StealthMark, 59.2 to 10.5. It leads on all 9 benchmarks. DeepSeek-V4.1-Flash-1017 scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

59.2/100Overall rank 9/53
10.5/100Overall rank 53/53

General Intelligence

56.8/100
7.8/100

Visual Intelligence

63.5/100
14.9/100

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

Open modelMIT
Local modelOpen model · Apache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • DeepSeek-V4.1-Flash-1017
  • Qwen3.5-9B
  • Other models
  • Median

DATASHEET

Specs and pricing

DeepSeek-V4.1-Flash-1017 scores higher on StealthMark and runs 1.9× faster in our speed test. Qwen3.5-9B is 4.8× cheaper per output token. Both take about 1M tokens of context.

  • DeepSeek-V4.1-Flash-1017
  • Qwen3.5-9B
  • Other models
  • Median
PricePer 1M output tokens, input below
DeepSeek-V4.1-Flash-1017: $1.20$0.30 inputQwen3.5-9B: $0.254.8× cheaper$0.17 input
Context windowTokens per request, max output below
DeepSeek-V4.1-Flash-1017: 1MTied384K max outputQwen3.5-9B: 1.01MTied
Output speedTokens per second, our measurement
DeepSeek-V4.1-Flash-1017: 3101.9× fastertokens/sQwen3.5-9B: 161tokens/s
SizeTotal and active parameters
DeepSeek-V4.1-Flash-1017: 763B16B activeEstimatedQwen3.5-9B: 9BAll activeEstimated
Developer
DeepSeek-AIQwen
Released
17 Oct 20262 Mar 2026
Origin
ChinaBoth
Input → output
Text, image → textText, image, video → text
Architecture
Sparse mixture-of-experts with a causal encoder-decoder design and native image understanding.Dense causal language model with vision encoder; Gated DeltaNet + gated attention; MTP-trained

Full datasheets, every price and sourceDeepSeek-V4.1-Flash-1017 ↗Qwen3.5-9B ↗

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.

DeepSeek-V4.1-Flash-1017 52.9/100Rank 15/47

Survived 1 of 3
Foresight: complete playing field
Level 310 ptsTurn 15 / 20

Qwen3.5-9B 12.8/100Rank 43/47

Survived 0 of 3
Foresight: complete playing field
Level 32 ptsTurn 8 / 20

Points per level

LevelDeepSeek-V4.1-Flash-1017Qwen3.5-9B
Level 1Second Thoughts
26 ptsSurvived
4 ptsOut of lives
Level 2Pressure Pot
7 ptsOut of lives
4 ptsOut of lives
Level 3Hide or Flight
10 ptsOut of lives
2 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.

DeepSeek-V4.1-Flash-1017 73.9/100Rank 13/48

Cleared 5 of 5
Latch: complete playing field
Level 520 ptsTurn 30 / 40

Qwen3.5-9B 3.8/100Rank 43/48

Cleared 1 of 5
Latch: complete playing field
Level 54.4 ptsTurn 33 / 40

Points per level

LevelDeepSeek-V4.1-Flash-1017Qwen3.5-9B
Level 1Hold the door
5.2 ptsCleared
5 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
3.8 ptsFinished early
Level 3Relay vault
19.2 ptsCleared
1.2 ptsFinished early
Level 4Passing bay
16.4 ptsClearedFinished early · 3 beacons left
0.2 ptsFinished early
Level 5Second thoughts
20 ptsCleared
4.4 ptsFinished early

Newton's Mirror

Same task instructions

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

The judgment

DeepSeek-V4.1-Flash-1017

Principal sphere and airborne-black placements are supported, and diminishing bilateral chains provide limited optical structure. Missing nested imagery, incomplete outer chains, distorted first images and sparse emitter recurrence remain the dominant weaknesses. Oversized paint bodies and unresolved cyan contact impose separate limitations.

Qwen3.5-9B

Horizontal centering and a separate airborne black blob are visible. Cyan's recent contact and crimson's forward transport are insufficiently demonstrated, while sphere support remains obscured. The enlarged, lowered sphere substantially changes the composition. The wall and floor sphere images, recursive room structure and curved emitter mappings are almost entirely missing.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Qwen3.5-9B
State at 600 ms23.0/253.0/25
Camera and placement13.5/154.5/15
Reflections34.0/1202.0/120
Materials and scale8.5/103.0/10
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

DeepSeek-V4.1-Flash-1017

An expressive, intricately drawn storybook scene with a complete flowing silhouette and differentiated glossy materials. The supported main lens and continuous shrimp body make the central interaction readable, but reciprocal eye lines, facial magnification and the smaller lens grip remain ambiguous. Bright granular fringes and crowded accessory lines limit the finish.

Qwen3.5-9B

Glowing teal spheres and a harmonious palette provide visible strengths, but the central character remains seriously unresolved. A large gap separates head and torso, limbs cannot be traced, and scattered garment shapes fail to establish the ornate costume. The foreground mound replaces the tall enclosing arch. Clean primitive edges do not repair these construction failures.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Qwen3.5-9B
Task & likeness7.5/103.0/10
Anatomy & construction7.5/102.0/10
Space & placement8.0/103.0/10
Light & reflections7.0/103.5/10
Purposeful detail7.5/102.0/10
Artistry & character8.0/102.0/10
Materials & effects7.5/104.0/10
Visual integrity6.5/103.0/10

Benchmark task

DeepSeek-V4.1-Flash-1017

A whale and a tiny shrimp examine one another through bubble lenses, with an octopus nearby. The scene tests interacting characters, differences in scale and transparent materials.

Qwen3.5-9B

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

Mona Lisa

Same task instructions

Precise visual recall and portrait reconstruction.

The judgment

DeepSeek-V4.1-Flash-1017

A coherent graphic interpretation with controlled contours, modeled facial volume and purposeful portrait details. Replication remains limited by the frontal pose, enlarged face, altered expression and ambiguous crossed hands. Landscape layering provides depth, while schematic fabric, smooth surfaces and tonal bands constrain the finish.

Qwen3.5-9B

A centered dark oval with sparse facial marks forms a simple graphic face, but scarcely replicates the Mona Lisa. The portrait's body, crossed hands, clothing and landscape are missing, while angular facial construction and flat tones lose its likeness, volume and subtle expression.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Qwen3.5-9B
Task & likeness5.0/100.0/10
Anatomy & construction5.0/100.0/10
Space & placement6.0/100.0/10
Light & reflections6.0/100.0/10
Purposeful detail5.5/100.0/10
Artistry & character5.5/100.5/10
Materials & effects5.5/100.0/10
Visual integrity6.0/100.5/10

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

DeepSeek-V4.1-Flash-1017

A coherent, colorful beach illustration with controlled curves, clean layering and varied readable accessories. Castle details and small animal features strengthen its finish. Schematic airborne animals, uncertain board support, shallow architectural depth and decorative reflections limit physical coherence and drawing sophistication.

Qwen3.5-9B

The beach is recognizable, and sweeping shoreline curves provide basic rhythm. Wildlife and playful activity remain poorly resolved, with ambiguous body construction and object contact. The sun glows without corresponding reflections or surface lighting. Fragmented subjects and an unintegrated rectangular panel substantially weaken composition and finish.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Qwen3.5-9B
Task & likeness7.0/101.5/10
Anatomy & construction5.5/100.5/10
Space & placement5.5/101.5/10
Light & reflections6.0/101.0/10
Purposeful detail6.5/102.5/10
Artistry & character5.0/101.5/10
Materials & effects5.5/100.5/10
Visual integrity4.5/101.5/10

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

DeepSeek-V4.1-Flash-1017

This benchmark has not been assessed yet.

Qwen3.5-9B

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

DeepSeek-V4.1-Flash-1017

An appealing cartoon with recognizable riders, expressive faces and a cohesive twilight palette. Clean shapes support the composition, but ambiguous limb overlaps, weak seat contact and loosely resolved steering limit physical coherence. Lighting and water effects are decorative, with modest material differentiation and drawing complexity.

Qwen3.5-9B

Bright colors, clean individual shapes and basic animal cues make the scene partly recognizable. Back seating, body continuity, steering and jet ski construction remain unresolved. Background gradients and wave rhythm provide some finish, but substantial anatomical, spatial and interaction weaknesses dominate.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Qwen3.5-9B
Task & likeness8.0/102.5/10
Anatomy & construction7.0/101.0/10
Space & placement7.0/102.0/10
Light & reflections6.5/101.0/10
Purposeful detail7.0/101.5/10
Artistry & character7.0/101.0/10
Materials & effects6.5/101.0/10
Visual integrity8.0/102.5/10

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

Same task instructions

Subject construction and spatial relationships.

The judgment

DeepSeek-V4.1-Flash-1017

An expressive, controlled illustration with continuous body construction, substantial bicycle detail and effective landscape depth. Unclear foot-to-pedal and wing-to-handlebar contacts limit physical conviction and local readability. Purposeful detail and composition are stronger than directional lighting and material treatment.

Qwen3.5-9B

The oversized bill and orderly spoked wheels make the subject partly recognizable. Clean contours and strong color contrast provide graphic clarity, but unresolved appendages, steering, drivetrain and support dominate the construction. Sparse shading and detail further limit the illustration.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Qwen3.5-9B
Task & likeness8.5/104.0/10
Anatomy & construction7.0/101.5/10
Space & placement7.5/103.0/10
Light & reflections6.5/101.5/10
Purposeful detail7.5/102.5/10
Artistry & character7.0/101.5/10
Materials & effects7.0/101.5/10
Visual integrity7.5/102.5/10

Benchmark task

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