STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra vs Kimi K3

GPT-6.1 Terra leads Kimi K3 by 9.8 points on StealthMark, 60.4 to 50.6. It leads on 5 of 9 benchmarks, including both games, and Kimi K3 on 4. GPT-6.1 Terra scores higher on Newton's Mirror, with its largest category advantage in reflections.

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All results ↗
All results ↗

Overall StealthMark

60.4/100Overall rank 9/54
50.6/100Overall rank 16/54

General Intelligence

58.0/100
44.4/100

Visual Intelligence

64.9/100
61.4/100

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 modelKimi K3 License

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6.1 Terra
  • Kimi K3
  • Other models
  • Median

DATASHEET

Specs and pricing

GPT-6.1 Terra scores higher on StealthMark and is 2.2× cheaper per output token. Both take about 1.05M tokens of context.

  • GPT-6.1 Terra
  • Kimi K3
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6.1 Terra: $52.2× cheaper$1 inputKimi K3: $10.80$0.24 input
Context windowTokens per request, max output below
GPT-6.1 Terra: 1.05MTied128K max outputKimi K3: 1MTied1M max output
Output speedTokens per second, our measurement
GPT-6.1 Terra: Not measuredKimi K3: 115tokens/s
SizeTotal and active parameters
GPT-6.1 Terra: Not disclosedKimi K3: 2.8T104B active
Developer
OpenAIMoonshot AI
Released
26 Oct 202616 Jul 2026
Origin
United StatesChina
Input → output
Text, image → textBoth
Architecture
Not publishedMixture-of-Experts with KDA + Gated MLA attention, 896 experts and native vision encoder

Full datasheets, every price and sourceGPT-6.1 Terra ↗Kimi K3 ↗

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.

GPT-6.1 Terra 62.0/100Rank 9/50

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

Kimi K3 52.7/100Rank 17/50

Survived 0 of 3
Foresight: complete playing field
Level 311 ptsTurn 17 / 20

Points per level

LevelGPT-6.1 TerraKimi K3
Level 1Second Thoughts
21 ptsSurvived
17 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
10 ptsOut of lives
Level 3Hide or Flight
15 ptsSurvived
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.

GPT-6.1 Terra 77.7/100Rank 12/51

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

Kimi K3 57.7/100Rank 23/51

Cleared 3 of 5
Latch: complete playing field
Level 514.2 ptsTurn 4 / 40

Points per level

LevelGPT-6.1 TerraKimi K3
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9.6 ptsCleared
Level 3Relay vault
19.2 ptsCleared
18.2 ptsClearedFinished early · 3 beacons left
Level 4Passing bay
17.8 ptsClearedFinished early · 3 beacons left
14.2 ptsFinished early
Level 5Second thoughts
20.6 ptsCleared
14.2 ptsFinished early

Newton's Mirror

Same task instructions

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

The judgment

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.

Kimi K3

The room fills the complete portrait frame without visible borders or labels. The main sphere and airborne black are convincingly placed within the portrait frame. Paint ordering is supported, but its contact and transport history remains weakly expressed. Symmetric wall ghosts, inverted floor imagery and panel echoes establish a basic mirror system. Diffuse gradients dominate, with little ordered nested imagery or repeated emitter mapping on either planar or spherical surfaces. The wall images sit too low, and the floor image is unusually large and low.

Score breakdown

CategoryGPT-6.1 TerraKimi K3
State at 600 ms23.0/2518.0/25
Camera and placement11.0/158.0/15
Reflections33.0/12024.0/120
Materials and scale7.5/106.5/10
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

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.

Kimi K3

The indigo creature and warm reflected counterpart create a balanced, contemplative composition. Equations, constellations and book emblems give the transformation meaning. Clean silhouettes and controlled glow support the scene, but minimally articulated legs, shallow spatial cues and smooth, generalized surfaces limit its anatomical and material richness.

Score breakdown

CategoryGPT-6.1 TerraKimi K3
Task & likeness7.5/109.0/10
Anatomy & construction6.5/107.0/10
Space & placement6.5/108.0/10
Light & reflections6.0/107.5/10
Purposeful detail6.5/108.0/10
Artistry & character6.5/108.5/10
Materials & effects6.0/107.5/10
Visual integrity6.0/108.0/10

Benchmark task

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.

Kimi K3

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

Same task instructions

Precise visual recall and portrait reconstruction.

The judgment

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.

Kimi K3

The centered portrait, dark veil, folded hands and misty landscape clearly evoke Mona Lisa. Replication is limited by the elongated neck, simplified facial proportions and oval hands with shallow finger marks. Soft shading gives some volume, but pervasive blur substitutes for controlled painterly transitions and precise detail.

Score breakdown

CategoryGPT-6.1 TerraKimi K3
Task & likeness5.5/104.5/10
Anatomy & construction6.5/103.5/10
Space & placement4.5/104.5/10
Light & reflections6.5/104.5/10
Purposeful detail6.0/104.0/10
Artistry & character6.0/104.5/10
Materials & effects6.0/104.5/10
Visual integrity6.5/105.0/10

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

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.

Kimi K3

A coordinated sunset palette, expressive silhouettes and varied small details create a lively, appealing beach illustration. The central sun and framing palm and umbrella organize the busy scene, with clean contours preserving readability. Bodies and people remain diagrammatic, depth is shallow, and inverted figure reflections cross matte-looking sand without convincing surface lighting. Materials and movement are mostly conveyed through flat shapes.

Score breakdown

CategoryGPT-6.1 TerraKimi K3
Task & likeness8.5/108.5/10
Anatomy & construction7.5/107.0/10
Space & placement6.5/107.0/10
Light & reflections5.5/106.5/10
Purposeful detail7.5/108.5/10
Artistry & character7.0/108.5/10
Materials & effects6.5/106.5/10
Visual integrity7.5/107.0/10

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

GPT-6.1 Terra

This benchmark has not been assessed yet.

Kimi K3

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

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.

Kimi K3

The raccoon rides on the dog's back, and the dog's paw meets a steering assembly connected to the red hull. Expressive faces, a warm sunset and sweeping spray create an appealing composition. Crowded body overlaps obscure some limb connections, and the raccoon's right ear appears slightly separated. Flat shading and stylized reflections limit volume and depth.

Score breakdown

CategoryGPT-6.1 TerraKimi K3
Task & likeness6.5/108.0/10
Anatomy & construction5.5/106.5/10
Space & placement6.0/107.5/10
Light & reflections5.0/107.0/10
Purposeful detail7.0/107.5/10
Artistry & character6.0/106.0/10
Materials & effects6.0/107.5/10
Visual integrity7.0/107.0/10

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

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.

Kimi K3

The pelican and bicycle are immediately recognizable, with an expressive bill, flowing scarf and cheerful composition. Both legs remain attached, but pedal connections and wing contact with the handlebar are weakly resolved. Wheel alignment and landscape layers are coherent. Clean outlines support the illustration, while flat surfaces and limited lighting keep it short of masterful execution.

Score breakdown

CategoryGPT-6.1 TerraKimi K3
Task & likeness7.0/108.0/10
Anatomy & construction7.0/106.5/10
Space & placement6.0/107.5/10
Light & reflections5.5/105.0/10
Purposeful detail7.0/106.5/10
Artistry & character6.5/106.0/10
Materials & effects5.5/106.0/10
Visual integrity6.0/106.5/10

Benchmark task

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