STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra Low vs Qwen3.6-27B

GPT-6.1 Terra Low leads Qwen3.6-27B by 8.9 points on StealthMark, 41.3 to 32.4. It leads on 7 of 9 benchmarks, including Latch, and Qwen3.6-27B on 2, including Foresight. GPT-6.1 Terra Low scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

41.3/100Overall rank 35/55
32.4/100Overall rank 43/55

General Intelligence

34.3/100
25.6/100

Visual Intelligence

53.1/100
43.9/100

Open or local

Local modelOpen model · Apache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

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

DATASHEET

Specs and pricing

  • GPT-6.1 Terra Low
  • Qwen3.6-27B
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6.1 Terra Low: No list priceQwen3.6-27B: $3.60$0.60 input
Context windowTokens per request, max output below
GPT-6.1 Terra Low: Not publishedQwen3.6-27B: 1.01M64K max output
Output speedTokens per second, our measurement
GPT-6.1 Terra Low: Not measuredQwen3.6-27B: 96tokens/s
SizeTotal and active parameters
GPT-6.1 Terra Low: Not disclosedQwen3.6-27B: 27BAll active
Developer
Not publishedQwen / Alibaba
Released
Not published22 Apr 2026
Origin
Not publishedChina
Input → output
Not publishedText, 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 sourceQwen3.6-27B ↗

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 Low 36.1/100Rank 26/51

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

Qwen3.6-27B 37.8/100Rank 25/51

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

Points per level

LevelGPT-6.1 Terra LowQwen3.6-27B
Level 1Second Thoughts
4 ptsOut of lives
9 ptsOut of lives
Level 2Pressure Pot
8 ptsOut of lives
6 ptsOut of lives
Level 3Hide or Flight
9 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 Low 62.4/100Rank 23/52

Cleared 4 of 5
Latch: complete playing field
Level 520.6 ptsTurn 27 / 40

Qwen3.6-27B 28.5/100Rank 39/52

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

Points per level

LevelGPT-6.1 Terra LowQwen3.6-27B
Level 1Hold the door
5.2 ptsCleared
4.8 ptsCleared
Level 2Crossfeed
9.2 ptsCleared
8.8 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
18.8 ptsCleared
16.4 ptsClearedFinished early · 3 beacons left
Level 4Passing bay
10.2 ptsFinished early
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 Low

Deformed colored paint and a separate airborne black body establish readable interaction history. Cyan has travelled too far, framing differs substantially, and the mirror system supplies only elementary bands and oval copies. Missing recursive geometry, nested spherical imagery and emitter mapping remain the dominant weaknesses.

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 Terra LowQwen3.6-27B
State at 600 ms22.0/255.0/25
Camera and placement4.0/155.0/15
Reflections10.0/1208.0/120
Materials and scale6.0/104.0/10
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 Low

Six attached outward-facing heads, delicate scales and soft ivory shading establish an orderly decorative motif. Separate paddle-shaped bodies replace the required interlocking loops and leave no enclosed central hexagon. Surface detail provides interest, but repeated simple forms, schematic faces and limited anatomical modeling constrain the result.

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 Terra LowQwen3.6-27B
Task & likeness4.0/106.5/10
Anatomy & construction3.5/105.0/10
Space & placement4.5/106.5/10
Light & reflections5.5/105.5/10
Purposeful detail5.5/106.0/10
Artistry & character5.0/105.0/10
Materials & effects5.5/105.0/10
Visual integrity4.0/107.0/10

Benchmark task

GPT-6.1 Terra Low

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 Low

A recognizable, coherent portrait with purposeful facial detail, warm local volume and layered scenery. The frontal pose, enlarged face, merged hands and shallow clothing construction substantially limit replication and drawing skill. The visible successes support retaining the current assessment.

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 Terra LowQwen3.6-27B
Task & likeness5.0/102.5/10
Anatomy & construction4.5/103.0/10
Space & placement5.0/104.0/10
Light & reflections6.0/104.0/10
Purposeful detail5.0/102.5/10
Artistry & character5.5/102.5/10
Materials & effects5.0/103.0/10
Visual integrity6.0/104.0/10

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 Low

A coherent sunset scene demonstrates the beach, animals, birds and reflections. Flowing silhouettes, warm color transitions and intact attachments are its strongest properties. Simplified anatomy, the turtle's elevated viewing angle and symbolic surface effects constrain drawing complexity and physical depth.

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 Terra LowQwen3.6-27B
Task & likeness8.0/107.5/10
Anatomy & construction5.5/105.0/10
Space & placement5.5/105.5/10
Light & reflections6.5/105.5/10
Purposeful detail6.0/104.5/10
Artistry & character5.0/105.5/10
Materials & effects5.5/105.5/10
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 Low

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 Low

Recognizable animals, a coherent craft and sweeping wake make an appealing cartoon. Basic limb construction, weakly demonstrated raccoon seating and limited shared perspective constrain the scene. Small identifying details work well, while lighting and materials remain broadly graphic.

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 Terra LowQwen3.6-27B
Task & likeness6.5/104.5/10
Anatomy & construction5.0/103.5/10
Space & placement5.5/106.0/10
Light & reflections4.5/105.5/10
Purposeful detail6.0/105.5/10
Artistry & character5.0/104.0/10
Materials & effects5.0/105.5/10
Visual integrity6.0/102.5/10

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 Low

A coherent coastal illustration with a distinctive pelican, controlled contours and clearly organised bicycle wheels. Visible saddle support and shaped neck and wing contours earn credit beyond basic geometric construction. Rubbery legs, unresolved pedal contacts and absent steering contact limit the riding action. Lighting and materials remain restrained and spatially shallow.

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 Terra LowQwen3.6-27B
Task & likeness7.0/107.5/10
Anatomy & construction5.5/104.0/10
Space & placement6.0/106.5/10
Light & reflections5.5/105.0/10
Purposeful detail6.5/106.5/10
Artistry & character6.0/105.5/10
Materials & effects6.0/106.5/10
Visual integrity6.0/106.5/10

Benchmark task

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