STEALTHMARK · HEAD TO HEAD

All comparisons ↗

DeepSeek-V4.1-Flash vs GPT-6.1 Terra

GPT-6.1 Terra leads DeepSeek-V4.1-Flash by 10.4 points on StealthMark, 60.4 to 50.0. It leads on 6 of 9 benchmarks, including both games, and DeepSeek-V4.1-Flash on 3. GPT-6.1 Terra scores higher on Ground Truth.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

50.0/100Overall rank 17/54
60.4/100Overall rank 9/54

General Intelligence

48.5/100
58.0/100

Visual Intelligence

53.0/100
64.9/100

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

BENCHMARK BY BENCHMARK

Where each model leads

  • DeepSeek-V4.1-Flash
  • GPT-6.1 Terra
  • Other models
  • Median

DATASHEET

Specs and pricing

DeepSeek-V4.1-Flash is 4.4× cheaper per output token. GPT-6.1 Terra scores higher on StealthMark. Both take about 1M tokens of context.

  • DeepSeek-V4.1-Flash
  • GPT-6.1 Terra
  • Other models
  • Median
PricePer 1M output tokens, input below
DeepSeek-V4.1-Flash: $1.134.4× cheaper$0.28 inputGPT-6.1 Terra: $5$1 input
Context windowTokens per request, max output below
DeepSeek-V4.1-Flash: 1MTied384K max outputGPT-6.1 Terra: 1.05MTied128K max output
Output speedTokens per second, our measurement
DeepSeek-V4.1-Flash: 242tokens/sGPT-6.1 Terra: Not measured
SizeTotal and active parameters
DeepSeek-V4.1-Flash: 763B16B activeGPT-6.1 Terra: Not disclosed
Developer
DeepSeek-AIOpenAI
Released
10 Sep 202626 Oct 2026
Origin
ChinaUnited States
Input → output
Text, image → textBoth
Architecture
20-layer encoder + 20-layer decoder with CSA2, Single-Pass mHC, Engram n-gram memory and DSpark/MTPNot published

Full datasheets, every price and sourceDeepSeek-V4.1-Flash ↗GPT-6.1 Terra ↗

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 13/50

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

GPT-6.1 Terra 62.0/100Rank 9/50

Survived 2 of 3
Foresight: complete playing field
Level 315 ptsTurn 20 / 20

Points per level

LevelDeepSeek-V4.1-FlashGPT-6.1 Terra
Level 1Second Thoughts
16 ptsOut of lives
21 ptsSurvived
Level 2Pressure Pot
7 ptsOut of lives
9 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 22/51

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

GPT-6.1 Terra 77.7/100Rank 12/51

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

Points per level

LevelDeepSeek-V4.1-FlashGPT-6.1 Terra
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
17.8 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20.6 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

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.

GPT-6.1 Terra

The sphere, airborne black and first reflected silhouettes preserve important geometry within the portrait frame. Paint deformation, contact order and forward transport are supported, with a small crimson endpoint overshoot. Major optical omissions dominate: short finite reflection sequences and smooth bands replace extensive, spatially ordered mirror imagery. Dark gloss and crisp upper emitter shapes provide partial material credit.

Score breakdown

CategoryDeepSeek-V4.1-FlashGPT-6.1 Terra
State at 600 ms23.5/2523.0/25
Camera and placement13.5/1511.0/15
Reflections30.0/12033.0/120
Materials and scale8.0/107.5/10
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.

GPT-6.1 Terra

A balanced serpent emblem with six attached outward heads, delicate scales and softly rounded bodies. Its compact silhouette reads clearly, but central routing does not establish every alternating crossing or crisp inward corner. Repetitive texture, limited facial anatomy and weak contact shadows constrain its organic character.

Score breakdown

CategoryDeepSeek-V4.1-FlashGPT-6.1 Terra
Task & likeness7.0/107.5/10
Anatomy & construction6.5/106.5/10
Space & placement6.5/106.5/10
Light & reflections6.0/106.0/10
Purposeful detail7.0/106.5/10
Artistry & character7.5/106.5/10
Materials & effects7.0/106.0/10
Visual integrity7.0/106.0/10

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.

GPT-6.1 Terra

A pale serpent woven into an interlocking knot tests connected anatomy, repeated structure and readable overlaps. Organic surface detail must work with the overall geometry.

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.

GPT-6.1 Terra

A recognizable interpretation with developed facial shading, shaped sleeve folds and purposeful small features. These strengths support modest upward calibration, while the frontal torso, elongated proportions, schematic finger joints and unresolved seated support keep replication and construction uneven.

Score breakdown

CategoryDeepSeek-V4.1-FlashGPT-6.1 Terra
Task & likeness3.5/105.5/10
Anatomy & construction3.0/106.5/10
Space & placement4.5/104.5/10
Light & reflections4.5/106.5/10
Purposeful detail3.0/106.0/10
Artistry & character4.0/106.0/10
Materials & effects3.0/106.0/10
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.

GPT-6.1 Terra

A coherent sunset illustration with clear prompt fulfillment, controlled framing and varied, purposeful small details. Simplified joints, frontal staging, flattened animal forms and weakly directional shadows limit its anatomical, spatial and physical sophistication.

Score breakdown

CategoryDeepSeek-V4.1-FlashGPT-6.1 Terra
Task & likeness8.0/108.5/10
Anatomy & construction5.5/107.5/10
Space & placement6.5/106.5/10
Light & reflections6.5/105.5/10
Purposeful detail5.5/107.5/10
Artistry & character5.0/107.0/10
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.

GPT-6.1 Terra

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.

GPT-6.1 Terra

A coherent cartoon with expressive animals, readable steering and a clear wake. Fine facial and hull details reward inspection. The main limits are the boatlike craft, simplified joints, weakly braced frontal raccoon and minimal directional lighting or material depth.

Score breakdown

CategoryDeepSeek-V4.1-FlashGPT-6.1 Terra
Task & likeness5.0/106.5/10
Anatomy & construction4.0/105.5/10
Space & placement5.5/106.0/10
Light & reflections6.0/105.0/10
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.

GPT-6.1 Terra

A coherent pelican cyclist with expressive proportions, purposeful feather detail and developed bicycle machinery. Continuous body contours, aligned wheels and readable pedal contacts support the scene. Simplified articulation, shallow modelling and an unresolved steering connection limit construction and placement.

Score breakdown

CategoryDeepSeek-V4.1-FlashGPT-6.1 Terra
Task & likeness8.5/107.0/10
Anatomy & construction7.0/107.0/10
Space & placement7.5/106.0/10
Light & reflections7.0/105.5/10
Purposeful detail6.5/107.0/10
Artistry & character8.0/106.5/10
Materials & effects7.0/105.5/10
Visual integrity8.0/106.0/10

Benchmark task

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