STEALTHMARK · HEAD TO HEAD

All comparisons ↗

DeepSeek-V4.1-Flash-1017 vs Gemini 3.8 Flash

DeepSeek-V4.1-Flash-1017 leads Gemini 3.8 Flash by 11.3 points on StealthMark, 59.2 to 47.9. It leads on 7 of 9 benchmarks, including both games, and Gemini 3.8 Flash on 2. 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
47.9/100Overall rank 20/53

General Intelligence

56.8/100
43.9/100

Visual Intelligence

63.5/100
55.2/100

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-1017
  • Gemini 3.8 Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

DeepSeek-V4.1-Flash-1017 scores higher on StealthMark, is 3.1× cheaper per output token and runs 1.8× faster in our speed test. Both take about 1M tokens of context.

  • DeepSeek-V4.1-Flash-1017
  • Gemini 3.8 Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
DeepSeek-V4.1-Flash-1017: $1.203.1× cheaper$0.30 inputGemini 3.8 Flash: $3.75$0.75 input
Context windowTokens per request, max output below
DeepSeek-V4.1-Flash-1017: 1MTied384K max outputGemini 3.8 Flash: 1MTied64K max output
Output speedTokens per second, our measurement
DeepSeek-V4.1-Flash-1017: 3101.8× fastertokens/sGemini 3.8 Flash: 170tokens/s
SizeTotal and active parameters
DeepSeek-V4.1-Flash-1017: 763B16B activeEstimatedGemini 3.8 Flash: Not disclosed
Developer
DeepSeek-AIGoogle
Released
17 Oct 20262 Sep 2026
Origin
ChinaUnited States
Input → output
Text, image → textText, image, video, audio, PDF → text
Architecture
Sparse mixture-of-experts with a causal encoder-decoder design and native image understanding.Not published

Full datasheets, every price and sourceDeepSeek-V4.1-Flash-1017 ↗Gemini 3.8 Flash ↗

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

Gemini 3.8 Flash 45.4/100Rank 20/47

Survived 1 of 3
Foresight: complete playing field
Level 311 ptsTurn 17 / 20

Points per level

LevelDeepSeek-V4.1-Flash-1017Gemini 3.8 Flash
Level 1Second Thoughts
26 ptsSurvived
4 ptsOut of lives
Level 2Pressure Pot
7 ptsOut of lives
10 ptsSurvived
Level 3Hide or Flight
10 ptsOut of lives
11 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

Gemini 3.8 Flash 72.9/100Rank 14/48

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

Points per level

LevelDeepSeek-V4.1-Flash-1017Gemini 3.8 Flash
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9.8 ptsCleared
Level 3Relay vault
19.2 ptsCleared
18.8 ptsCleared
Level 4Passing bay
16.4 ptsClearedFinished early · 3 beacons left
17.8 ptsClearedFinished early · 1 beacon left
Level 5Second thoughts
20 ptsCleared
20.6 ptsCleared

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.

Gemini 3.8 Flash

Crimson is carried well down the camera-facing surface, supporting its earlier interaction. The depiction remains highly simplified, with imperfect material rendering. Isolated wall and floor images and a few highlights provide scant reflective evidence; displaced first reflections, missing receding chains and absent nested sphere and emitter imagery leave the room's optical structure largely unsupported.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Gemini 3.8 Flash
State at 600 ms23.0/2522.5/25
Camera and placement13.5/1511.0/15
Reflections34.0/1204.5/120
Materials and scale8.5/107.0/10
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-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.

Gemini 3.8 Flash

The dominant four-point silhouette, luminous color progression, raised brows and enormous grin closely fulfill the brief. Attached, secondary limbs support the exuberant expression. Clean facial drawing and glossy eyes give strong character, while shallow depth, minimally articulated extremities and visible steps in the outer glow limit refinement.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Gemini 3.8 Flash
Task & likeness7.5/108.0/10
Anatomy & construction7.5/106.0/10
Space & placement8.0/106.5/10
Light & reflections7.0/107.0/10
Purposeful detail7.5/105.0/10
Artistry & character8.0/103.5/10
Materials & effects7.5/105.0/10
Visual integrity6.5/106.5/10

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.

Gemini 3.8 Flash

A luminous star-shaped creature tests expressive features, a clear silhouette and smooth colour transitions.

Mona Lisa

Different 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.

Gemini 3.8 Flash

The dark clothing, overlapping hands and hazy landscape make the Mona Lisa reference recognizable. Replication is limited by the frontal, elongated face, heavy mouth and chin, and poorly resolved hands, wrists and forearm. Soft shading gives some volume, but muddy transitions, blunt landscape shapes and rigid facial modeling weaken the portrait’s expression and painterly character.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Gemini 3.8 Flash
Task & likeness5.0/103.0/10
Anatomy & construction5.0/102.0/10
Space & placement6.0/103.5/10
Light & reflections6.0/103.0/10
Purposeful detail5.5/105.0/10
Artistry & character5.5/103.0/10
Materials & effects5.5/105.0/10
Visual integrity6.0/101.0/10

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.

Gemini 3.8 Flash

A vivid purple-and-gold sunset anchors an appealing beach composition with dolphins, birds, a turtle and playful accessories. Palm silhouettes frame the bright reflection effectively. Sparse animal anatomy, wirelike palm foliage, conspicuously regular reflection bands and limited surface texture keep the execution below exceptional.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Gemini 3.8 Flash
Task & likeness7.0/109.0/10
Anatomy & construction5.5/107.0/10
Space & placement5.5/107.0/10
Light & reflections6.0/108.0/10
Purposeful detail6.5/107.0/10
Artistry & character5.0/107.0/10
Materials & effects5.5/107.0/10
Visual integrity4.5/108.0/10

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

DeepSeek-V4.1-Flash-1017

This benchmark has not been assessed yet.

Gemini 3.8 Flash

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.

Gemini 3.8 Flash

Expressive animals, a bold diagonal hull and sweeping spray create an appealing action scene. The raccoon's support on the dog's back is unclear, and the dog lacks a readable paw-to-control grip and connected steering assembly. Clean graphic shapes and lively accessories are stronger than the anatomical construction. Sunset illumination and reflections remain largely decorative.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Gemini 3.8 Flash
Task & likeness8.0/107.0/10
Anatomy & construction7.0/106.0/10
Space & placement7.0/107.0/10
Light & reflections6.5/106.5/10
Purposeful detail7.0/107.5/10
Artistry & character7.0/107.5/10
Materials & effects6.5/107.5/10
Visual integrity8.0/107.5/10

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.

Gemini 3.8 Flash

The pelican’s enormous bill, lively feathers and orange bicycle create a clear, appealing composition. Basket contents, spokes and facial details reward inspection. Both legs connect to the body, but foot-to-pedal placement and wing-to-handlebar contact are ambiguous. Bicycle mechanics and lighting remain schematic, limiting an otherwise polished illustration.

Score breakdown

CategoryDeepSeek-V4.1-Flash-1017Gemini 3.8 Flash
Task & likeness8.5/109.0/10
Anatomy & construction7.0/107.5/10
Space & placement7.5/107.5/10
Light & reflections6.5/107.0/10
Purposeful detail7.5/108.5/10
Artistry & character7.0/108.0/10
Materials & effects7.0/107.0/10
Visual integrity7.5/108.0/10

Benchmark task

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