STEALTHMARK · HEAD TO HEAD

All comparisons ↗

DeepSeek-V4.1-Flash vs Kimi K3.1 Pro

Kimi K3.1 Pro leads DeepSeek-V4.1-Flash by 6.7 points on StealthMark, 56.7 to 50.0. It leads on 6 of 9 benchmarks, including both games, and DeepSeek-V4.1-Flash on 3. DeepSeek-V4.1-Flash scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

50.0/100Overall rank 16/53
56.7/100Overall rank 11/53

General Intelligence

48.5/100
53.9/100

Visual Intelligence

53.0/100
62.0/100

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

BENCHMARK BY BENCHMARK

Where each model leads

  • DeepSeek-V4.1-Flash
  • Kimi K3.1 Pro
  • Other models
  • Median

DATASHEET

Specs and pricing

DeepSeek-V4.1-Flash is 8.8× cheaper per output token and runs 2.1× faster in our speed test. Kimi K3.1 Pro scores higher on StealthMark. Both take about 1M tokens of context.

  • DeepSeek-V4.1-Flash
  • Kimi K3.1 Pro
  • Other models
  • Median
PricePer 1M output tokens, input below
DeepSeek-V4.1-Flash: $1.138.8× cheaper$0.28 inputKimi K3.1 Pro: $10$2 input
Context windowTokens per request, max output below
DeepSeek-V4.1-Flash: 1MTied384K max outputKimi K3.1 Pro: 1MTied1M max output
Output speedTokens per second, our measurement
DeepSeek-V4.1-Flash: 2422.1× fastertokens/sKimi K3.1 Pro: 117tokens/s
SizeTotal and active parameters
DeepSeek-V4.1-Flash: 763B16B activeKimi K3.1 Pro: 2.8T104B activeEstimated
Developer
DeepSeek-AIMoonshot AI
Released
10 Sep 202623 Oct 2026
Origin
ChinaBoth
Input → output
Text, image → textText, image, video → text
Architecture
20-layer encoder + 20-layer decoder with CSA2, Single-Pass mHC, Engram n-gram memory and DSpark/MTPPost-trained version of Kimi K3, a Mixture-of-Experts model

Full datasheets, every price and sourceDeepSeek-V4.1-Flash ↗Kimi K3.1 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.

DeepSeek-V4.1-Flash 55.4/100Rank 12/47

Survived 1 of 3
Foresight: complete playing field
Level 318 ptsTurn 20 / 20

Kimi K3.1 Pro 61.1/100Rank 10/47

Survived 1 of 3
Foresight: complete playing field
Level 315 ptsTurn 20 / 20

Points per level

LevelDeepSeek-V4.1-FlashKimi K3.1 Pro
Level 1Second Thoughts
16 ptsOut of lives
15 ptsOut of lives
Level 2Pressure Pot
7 ptsOut of lives
12 ptsOut of lives
Level 3Hide or Flight
18 ptsSurvived
15 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.

DeepSeek-V4.1-Flash 65.2/100Rank 19/48

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

Kimi K3.1 Pro 81.8/100Rank 8/48

Cleared 5 of 5
Latch: complete playing field
Level 519.8 ptsTurn 31 / 40

Points per level

LevelDeepSeek-V4.1-FlashKimi K3.1 Pro
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9 ptsCleared
9.8 ptsCleared
Level 3Relay vault
17.2 ptsClearedFinished early · 3 beacons left
19.2 ptsCleared
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20.6 ptsCleared
19.8 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

DeepSeek-V4.1-Flash

The first wall and floor images provide limited reflection geometry, but the room's mirror recurrence is substantially incomplete, particularly the outer-edge chains and lateral sightlines. The main sphere and its large reflected images lack ordered, curved room and virtual-sphere imagery. Repeated emitter mapping is missing from both planar mirrors and spherical surfaces.

Kimi K3.1 Pro

The settled sphere, separate airborne black paint and crimson-before-cyan interaction are supported, with a modest crimson travel overshoot. A shared downward framing displacement remains after accounting for the square canvas. The principal limitation is the reflection system: sparse sphere copies and generic curved bands omit most of the ordered mirror-room structure. Materials receive a small upward revision because bounded bright images and dark bands visibly establish some polish, while soft shading and bulky paint remain separate weaknesses.

Score breakdown

CategoryDeepSeek-V4.1-FlashKimi K3.1 Pro
State at 600 ms23.5/2523.5/25
Camera and placement13.5/1510.5/15
Reflections30.0/12026.0/120
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

DeepSeek-V4.1-Flash

Expressive faces, cobalt coloring and a flowing diagonal composition make the mutual inspection charming. Execution is uneven: the long pointed flipper lacks a convincing grip, the enlarged shrimp face appears detached from its body, and the large lens is oval. Flat anatomical shading and an unexplained purple ringed patch beneath the whale weaken the requested polished depth.

Kimi K3.1 Pro

The transformed reflection, attentive pose and constellation anatomy clearly communicate introspection. Purposeful fine details enrich a coherent composition. Tubular limbs, crowded lower-body overlaps, shallow depth and limited cast lighting keep the overall execution within the competent range.

Score breakdown

CategoryDeepSeek-V4.1-FlashKimi K3.1 Pro
Task & likeness7.0/108.0/10
Anatomy & construction6.5/105.5/10
Space & placement6.5/106.5/10
Light & reflections6.0/106.5/10
Purposeful detail7.0/107.5/10
Artistry & character7.5/107.0/10
Materials & effects7.0/107.0/10
Visual integrity7.0/107.0/10

Benchmark task

DeepSeek-V4.1-Flash

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.

Kimi K3.1 Pro

An imagined creature encounters its reflection. The scene tests original character design, visual self-interpretation and the relationship between a subject and its reflected image.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

DeepSeek-V4.1-Flash

The centered portrait, dark hair, crossed hands and muted landscape make the reference recognizable. Replication is limited by the frontal pose, staring eyes and weakly defined smile. Hands are overlapping oval masses with almost no finger articulation, while wrists disappear into sleeves. Soft gradients suggest volume, but broad, indistinct surfaces and faint stray lines leave the drawing basic and uneven.

Kimi K3.1 Pro

A coherent, recognizable interpretation with controlled color and readable landscape layers. Replication is limited by the frontal seated construction, elongated facial proportions and oversized, weakly articulated hands. Smooth shading supplies some volume but little of the reference's subtle expression, fabric structure or atmospheric transitions.

Score breakdown

CategoryDeepSeek-V4.1-FlashKimi K3.1 Pro
Task & likeness3.5/105.0/10
Anatomy & construction3.0/105.0/10
Space & placement4.5/105.5/10
Light & reflections4.5/106.0/10
Purposeful detail3.0/105.5/10
Artistry & character4.0/106.0/10
Materials & effects3.0/105.0/10
Visual integrity5.5/106.5/10

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

The glowing sunset, silhouetted palm and playful foreground create a coherent, appealing beach illustration. Birds, crab, boat and reflections fulfill the brief. The airborne animals have weakly defined anatomy and little convincing splash interaction. Broad, blurred reflections and largely flat surfaces limit depth and finish.

Kimi K3.1 Pro

A coherent, playful beach illustration with readable animals, an organized composition and an aligned sunset reflection. Connected silhouettes, sand texture and atmospheric effects demonstrate controlled execution. Simplified joints, flattened foreground viewpoints and inconsistent shadows limit anatomical and spatial credibility.

Score breakdown

CategoryDeepSeek-V4.1-FlashKimi K3.1 Pro
Task & likeness8.0/108.5/10
Anatomy & construction5.5/105.5/10
Space & placement6.5/105.5/10
Light & reflections6.5/106.5/10
Purposeful detail5.5/106.5/10
Artistry & character5.0/105.5/10
Materials & effects6.0/106.5/10
Visual integrity5.5/107.5/10

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

This benchmark has not been assessed yet.

Kimi K3.1 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

DeepSeek-V4.1-Flash

The sunset palette and silhouetted grouping establish an appealing scene. A masked rider sits above a pointed-eared dog, but merged body shapes leave limbs and support unresolved. The boatlike craft lacks readable steering controls, so the requested action is unclear. Sparse facial marks and glowing spray dots offer limited detail.

Kimi K3.1 Pro

The additional comparisons support retaining the assessment. Readable steering, shaped animal contours and purposeful details coexist with simplified joints, a frontal passenger whose seated weight is weakly conveyed, and limited physical lighting. The angled craft establishes more depth than the riding pose resolves.

Score breakdown

CategoryDeepSeek-V4.1-FlashKimi K3.1 Pro
Task & likeness5.0/107.0/10
Anatomy & construction4.0/105.5/10
Space & placement5.5/106.0/10
Light & reflections6.0/105.5/10
Purposeful detail3.5/107.0/10
Artistry & character4.0/106.0/10
Materials & effects5.0/106.0/10
Visual integrity6.0/107.0/10

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

DeepSeek-V4.1-Flash

A recognizable pelican rides a brightly colored bicycle against a striking sunset. The sweeping bill, trailing scarf and circular wheels create a controlled composition. Both legs connect, but pedal linkage, body support and the wing's handlebar grip remain loosely resolved. Clean vector shapes and feather details work well; simplified shading limits volume and integration with the sunset light.

Kimi K3.1 Pro

A characterful coastal illustration with controlled contours and varied feather, accessory and bicycle detail. Layered scenery and subtle shading enrich the presentation. Soft leg articulation, unresolved riding contacts, shallow depth and generalized lighting limit physical precision.

Score breakdown

CategoryDeepSeek-V4.1-FlashKimi K3.1 Pro
Task & likeness8.5/108.5/10
Anatomy & construction7.0/107.5/10
Space & placement7.5/106.5/10
Light & reflections7.0/106.5/10
Purposeful detail6.5/107.5/10
Artistry & character8.0/107.5/10
Materials & effects7.0/106.5/10
Visual integrity8.0/107.5/10

Benchmark task

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