STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra Low vs Qwen3.5-9B

GPT-6.1 Terra Low leads Qwen3.5-9B by 30.4 points on StealthMark, 41.3 to 10.9. It leads on all 9 benchmarks. GPT-6.1 Terra Low scores higher on Beach, with its largest category advantage in anatomy & construction.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

41.3/100Overall rank 35/55
10.9/100Overall rank 55/55

General Intelligence

34.3/100
7.9/100

Visual Intelligence

53.1/100
15.6/100

Open or local

Local modelOpen model · Apache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6.1 Terra Low
  • Qwen3.5-9B
  • Other models
  • Median

DATASHEET

Specs and pricing

  • GPT-6.1 Terra Low
  • Qwen3.5-9B
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6.1 Terra Low: No list priceQwen3.5-9B: $0.25$0.17 input
Context windowTokens per request, max output below
GPT-6.1 Terra Low: Not publishedQwen3.5-9B: 1.01M
Output speedTokens per second, our measurement
GPT-6.1 Terra Low: Not measuredQwen3.5-9B: 161tokens/s
SizeTotal and active parameters
GPT-6.1 Terra Low: Not disclosedQwen3.5-9B: 9BAll activeEstimated
Developer
Not publishedQwen
Released
Not published2 Mar 2026
Origin
Not publishedChina
Input → output
Not publishedText, image, video → text
Architecture
Not publishedDense causal language model with vision encoder; Gated DeltaNet + gated attention; MTP-trained

Full datasheets, every price and sourceQwen3.5-9B ↗

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

Qwen3.5-9B 12.8/100Rank 47/51

Survived 0 of 3
Foresight: complete playing field
Level 32 ptsTurn 8 / 20

Points per level

LevelGPT-6.1 Terra LowQwen3.5-9B
Level 1Second Thoughts
4 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
8 ptsOut of lives
4 ptsOut of lives
Level 3Hide or Flight
9 ptsSurvived
2 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 Low 62.4/100Rank 23/52

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

Qwen3.5-9B 3.8/100Rank 47/52

Cleared 1 of 5
Latch: complete playing field
Level 54.4 ptsTurn 33 / 40

Points per level

LevelGPT-6.1 Terra LowQwen3.5-9B
Level 1Hold the door
5.2 ptsCleared
5 ptsCleared
Level 2Crossfeed
9.2 ptsCleared
3.8 ptsFinished early
Level 3Relay vault
18.8 ptsCleared
1.2 ptsFinished early
Level 4Passing bay
10.2 ptsFinished early
0.2 ptsFinished early
Level 5Second thoughts
20.6 ptsCleared
4.4 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.

Qwen3.5-9B

Horizontal centering and a separate airborne black blob are visible. Cyan's recent contact and crimson's forward transport are insufficiently demonstrated, while sphere support remains obscured. The enlarged, lowered sphere substantially changes the composition. The wall and floor sphere images, recursive room structure and curved emitter mappings are almost entirely missing.

Score breakdown

CategoryGPT-6.1 Terra LowQwen3.5-9B
State at 600 ms22.0/253.0/25
Camera and placement4.0/154.5/15
Reflections10.0/1202.0/120
Materials and scale6.0/103.0/10
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.

Qwen3.5-9B

Glowing teal spheres and a harmonious palette provide visible strengths, but the central character remains seriously unresolved. A large gap separates head and torso, limbs cannot be traced, and scattered garment shapes fail to establish the ornate costume. The foreground mound replaces the tall enclosing arch. Clean primitive edges do not repair these construction failures.

Score breakdown

CategoryGPT-6.1 Terra LowQwen3.5-9B
Task & likeness4.0/103.0/10
Anatomy & construction3.5/102.0/10
Space & placement4.5/103.0/10
Light & reflections5.5/103.5/10
Purposeful detail5.5/102.0/10
Artistry & character5.0/102.0/10
Materials & effects5.5/104.0/10
Visual integrity4.0/103.0/10

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.

Qwen3.5-9B

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.

Qwen3.5-9B

A centered dark oval with sparse facial marks forms a simple graphic face, but scarcely replicates the Mona Lisa. The portrait's body, crossed hands, clothing and landscape are missing, while angular facial construction and flat tones lose its likeness, volume and subtle expression.

Score breakdown

CategoryGPT-6.1 Terra LowQwen3.5-9B
Task & likeness5.0/100.0/10
Anatomy & construction4.5/100.5/10
Space & placement5.0/100.0/10
Light & reflections6.0/100.0/10
Purposeful detail5.0/100.5/10
Artistry & character5.5/101.0/10
Materials & effects5.0/100.0/10
Visual integrity6.0/100.5/10

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

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.

Qwen3.5-9B

The beach is recognizable, and sweeping shoreline curves provide basic rhythm. Wildlife and playful activity remain poorly resolved, with ambiguous body construction and object contact. The sun glows without corresponding reflections or surface lighting. Fragmented subjects and an unintegrated rectangular panel substantially weaken composition and finish.

Score breakdown

CategoryGPT-6.1 Terra LowQwen3.5-9B
Task & likeness8.0/101.5/10
Anatomy & construction5.5/100.5/10
Space & placement5.5/101.5/10
Light & reflections6.5/101.0/10
Purposeful detail6.0/102.5/10
Artistry & character5.0/101.5/10
Materials & effects5.5/100.5/10
Visual integrity7.5/101.5/10

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

GPT-6.1 Terra Low

This benchmark has not been assessed yet.

Qwen3.5-9B

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.

Qwen3.5-9B

Bright colors, clean individual shapes and basic animal cues make the scene partly recognizable. Back seating, body continuity, steering and jet ski construction remain unresolved. Background gradients and wave rhythm provide some finish, but substantial anatomical, spatial and interaction weaknesses dominate.

Score breakdown

CategoryGPT-6.1 Terra LowQwen3.5-9B
Task & likeness6.5/102.5/10
Anatomy & construction5.0/101.0/10
Space & placement5.5/102.0/10
Light & reflections4.5/101.0/10
Purposeful detail6.0/101.5/10
Artistry & character5.0/101.0/10
Materials & effects5.0/101.0/10
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.

Qwen3.5-9B

The oversized bill and orderly spoked wheels make the subject partly recognizable. Clean contours and strong color contrast provide graphic clarity, but unresolved appendages, steering, drivetrain and support dominate the construction. Sparse shading and detail further limit the illustration.

Score breakdown

CategoryGPT-6.1 Terra LowQwen3.5-9B
Task & likeness7.0/104.0/10
Anatomy & construction5.5/101.5/10
Space & placement6.0/103.0/10
Light & reflections5.5/101.5/10
Purposeful detail6.5/102.5/10
Artistry & character6.0/101.5/10
Materials & effects6.0/101.5/10
Visual integrity6.0/102.5/10

Benchmark task

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