STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra vs Qwen3.6-27B

GPT-6.1 Terra leads Qwen3.6-27B by 28.0 points on StealthMark, 60.4 to 32.4. It leads on all 9 benchmarks. GPT-6.1 Terra scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

60.4/100Overall rank 9/54
32.4/100Overall rank 42/54

General Intelligence

58.0/100
25.6/100

Visual Intelligence

64.9/100
43.9/100

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

Local modelOpen model · Apache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6.1 Terra
  • Qwen3.6-27B
  • Other models
  • Median

DATASHEET

Specs and pricing

GPT-6.1 Terra scores higher on StealthMark. Qwen3.6-27B is 39% cheaper per output token. Both take about 1.05M tokens of context.

  • GPT-6.1 Terra
  • Qwen3.6-27B
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6.1 Terra: $5$1 inputQwen3.6-27B: $3.6039% cheaper$0.60 input
Context windowTokens per request, max output below
GPT-6.1 Terra: 1.05MTied128K max outputQwen3.6-27B: 1.01MTied64K max output
Output speedTokens per second, our measurement
GPT-6.1 Terra: Not measuredQwen3.6-27B: 96tokens/s
SizeTotal and active parameters
GPT-6.1 Terra: Not disclosedQwen3.6-27B: 27BAll active
Developer
OpenAIQwen / Alibaba
Released
26 Oct 202622 Apr 2026
Origin
United StatesChina
Input → output
Text, image → textText, image, video → text
Architecture
Not publishedDense causal language model with vision encoder; hybrid Gated DeltaNet and gated attention; MTP-trained

Full datasheets, every price and sourceGPT-6.1 Terra ↗Qwen3.6-27B ↗

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

Qwen3.6-27B 37.8/100Rank 25/50

Survived 1 of 3
Foresight: complete playing field
Level 39 ptsTurn 20 / 20

Points per level

LevelGPT-6.1 TerraQwen3.6-27B
Level 1Second Thoughts
21 ptsSurvived
9 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
6 ptsOut of lives
Level 3Hide or Flight
15 ptsSurvived
9 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.

GPT-6.1 Terra 77.7/100Rank 12/51

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

Qwen3.6-27B 28.5/100Rank 38/51

Cleared 3 of 5
Latch: complete playing field
Level 511 ptsTurn 25 / 40

Points per level

LevelGPT-6.1 TerraQwen3.6-27B
Level 1Hold the door
5.2 ptsCleared
4.8 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
8.8 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
19.2 ptsCleared
16.4 ptsClearedFinished early · 3 beacons left
Level 4Passing bay
17.8 ptsClearedFinished early · 3 beacons left
13.4 ptsFinished early
Level 5Second thoughts
20.6 ptsCleared
11 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.

Qwen3.6-27B

The artwork depicts a shaded sphere, distinct paint colors and a separate airborne black blob. Crimson's apex overlap does not establish its earlier interaction and transport, while cyan's recent contact remains unsupported. Horizontal centering supplies limited camera agreement, but the sphere, black blob and prominent panel have substantial placement or projection departures. A few planar echoes provide reflection evidence; isolated patches and gradients replace most of the required mirror structure.

Score breakdown

CategoryGPT-6.1 TerraQwen3.6-27B
State at 600 ms23.0/255.0/25
Camera and placement11.0/155.0/15
Reflections33.0/1208.0/120
Materials and scale7.5/104.0/10
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

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.

Qwen3.6-27B

An appealing decorative illustration with coordinated ornament, flowing panels and three glowing orbital lights. The arm arrangement reverses the requested sides. Uncertain neck continuity, concealed leg articulation, simplified paws, crowded chest jewelry and shallow surface modeling limit pose clarity and finish.

Score breakdown

CategoryGPT-6.1 TerraQwen3.6-27B
Task & likeness7.5/106.5/10
Anatomy & construction6.5/105.0/10
Space & placement6.5/106.5/10
Light & reflections6.0/105.5/10
Purposeful detail6.5/106.0/10
Artistry & character6.5/105.0/10
Materials & effects6.0/105.0/10
Visual integrity6.0/107.0/10

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.

Qwen3.6-27B

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

Mona Lisa

Different 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.

Qwen3.6-27B

The portrait loosely evokes Mona Lisa through its palette and silhouette. Readable pupils, brows and lips provide limited detail, and the torso remains continuous. The frontal elongated face, unresolved chest-level limb forms, shallow landscape and pervasive blur substantially weaken likeness, anatomy and finish.

Score breakdown

CategoryGPT-6.1 TerraQwen3.6-27B
Task & likeness5.5/102.5/10
Anatomy & construction6.5/103.0/10
Space & placement4.5/104.0/10
Light & reflections6.5/104.0/10
Purposeful detail6.0/102.5/10
Artistry & character6.0/102.5/10
Materials & effects6.0/103.0/10
Visual integrity6.5/104.0/10

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.

Qwen3.6-27B

A recognizable sunset beach with balanced palms, clean shapes and effective warm–cool contrast. Small animals and play equipment address the brief, but rudimentary anatomy, uncertain water contacts, sparse reflections and flat materials keep the drawing basic or uneven.

Score breakdown

CategoryGPT-6.1 TerraQwen3.6-27B
Task & likeness8.5/107.5/10
Anatomy & construction7.5/105.0/10
Space & placement6.5/105.5/10
Light & reflections5.5/105.5/10
Purposeful detail7.5/104.5/10
Artistry & character7.0/105.5/10
Materials & effects6.5/105.5/10
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.

Qwen3.6-27B

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.

Qwen3.6-27B

A readable cartoon with balanced colors, clean shapes and a clearly supported raccoon. Continuous body construction and modest shading deserve credit. Rudimentary limbs, unresolved steering connections, stiff gestures and schematic water effects limit physical credibility and finish.

Score breakdown

CategoryGPT-6.1 TerraQwen3.6-27B
Task & likeness6.5/104.5/10
Anatomy & construction5.5/103.5/10
Space & placement6.0/106.0/10
Light & reflections5.0/105.5/10
Purposeful detail7.0/105.5/10
Artistry & character6.0/104.0/10
Materials & effects6.0/105.5/10
Visual integrity7.0/102.5/10

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

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.

Qwen3.6-27B

A lively, coherent illustration with recognizable pelican features, purposeful accessories and useful surface variation. Ambiguous neck layering, uncertain pedal engagement and an unresolved drivetrain limit construction. Aligned wheels and layered scenery establish placement, while inconsistent shadow direction and crowded overlaps constrain finish.

Score breakdown

CategoryGPT-6.1 TerraQwen3.6-27B
Task & likeness7.0/107.5/10
Anatomy & construction7.0/104.0/10
Space & placement6.0/106.5/10
Light & reflections5.5/105.0/10
Purposeful detail7.0/106.5/10
Artistry & character6.5/105.5/10
Materials & effects5.5/106.5/10
Visual integrity6.0/106.5/10

Benchmark task

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