STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra Low vs Kolibri-1

GPT-6.1 Terra Low leads Kolibri-1 by 27.7 points on StealthMark, 41.3 to 13.6. It leads on all 7 benchmarks with results for both. 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
13.6/100Overall rank 54/55

General Intelligence

34.3/100
12.3/100

Visual Intelligence

53.1/100
15.0/100

Open or local

Local modelOpen model · Apache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6.1 Terra Low
  • Kolibri-1
  • Other models
  • Median

DATASHEET

Specs and pricing

  • GPT-6.1 Terra Low
  • Kolibri-1
  • Other models
  • Median
Context windowTokens per request, max output below
GPT-6.1 Terra Low: Not publishedKolibri-1: 1M
Output speedTokens per second, our measurement
GPT-6.1 Terra Low: Not measuredKolibri-1: 166tokens/s
SizeTotal and active parameters
GPT-6.1 Terra Low: Not disclosedKolibri-1: 78.1B3.46B active
Developer
Not publishedAleph Alpha
Released
Not published3 Oct 2026
Origin
Not publishedGermany
Input → output
Not publishedText → text
Architecture
Not publishedMixture-of-Experts with 4:1 sliding-window-attention to global-attention pattern

Full datasheets, every price and sourceKolibri-1 ↗

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

Points per level

LevelGPT-6.1 Terra LowKolibri-1
Level 1Second Thoughts
4 ptsOut of lives
No run
Level 2Pressure Pot
8 ptsOut of lives
No run
Level 3Hide or Flight
9 ptsSurvived
No run

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

Points per level

LevelGPT-6.1 Terra LowKolibri-1
Level 1Hold the door
5.2 ptsCleared
No run
Level 2Crossfeed
9.2 ptsCleared
No run
Level 3Relay vault
18.8 ptsCleared
No run
Level 4Passing bay
10.2 ptsFinished early
No run
Level 5Second thoughts
20.6 ptsCleared
No run

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.

Kolibri-1

A segmented gray perimeter surrounds a black field containing one large, low-positioned gray sphere and two small colored circles. Rounded volume and restrained paint scale earn partial material credit. The image does not demonstrate the required optical structure, while paint history, airborne black and settled support remain largely unresolved.

Score breakdown

CategoryGPT-6.1 Terra LowKolibri-1
State at 600 ms22.0/259.5/25
Camera and placement4.0/151.5/15
Reflections10.0/1200.0/120
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.

Kolibri-1

A restrained ivory, teal and green palette gives the image simple graphic coherence. Execution remains rudimentary: detached oval wings, ambiguous central anatomy and unclear feeding contact prevent a convincing hummingbird scene. The requested feather structure, botanical detail, lighting and enclosing arch are largely unresolved.

Score breakdown

CategoryGPT-6.1 Terra LowKolibri-1
Task & likeness4.0/102.5/10
Anatomy & construction3.5/102.0/10
Space & placement4.5/103.0/10
Light & reflections5.5/102.0/10
Purposeful detail5.5/101.5/10
Artistry & character5.0/101.5/10
Materials & effects5.5/102.0/10
Visual integrity4.0/105.5/10

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.

Kolibri-1

A jewel-coloured hummingbird hovering in flight tests avian anatomy, delicate structure and iridescent surface detail.

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.

Kolibri-1

The candidate offers a clean, highly simplified frontal portrait with warm skin and dark hair. Its oversized oval face, schematic features and unresolved body provide little Mona Lisa likeness. Missing crossed hands, clothing detail and landscape remove essential parts of the original composition; smooth gradients supply only limited volume.

Score breakdown

CategoryGPT-6.1 Terra LowKolibri-1
Task & likeness5.0/100.5/10
Anatomy & construction4.5/100.5/10
Space & placement5.0/100.0/10
Light & reflections6.0/100.0/10
Purposeful detail5.0/100.0/10
Artistry & character5.5/100.5/10
Materials & effects5.0/100.5/10
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.

Kolibri-1

A recognizable sunset beach has an appealing purple-orange gradient and clean geometric edges. Birds and animals remain unresolved, terrain obscures the relationship between shore and water, and reflections are absent. Sparse detail, flat materials and limited activity keep the drawing elementary despite its tidy rendering.

Score breakdown

CategoryGPT-6.1 Terra LowKolibri-1
Task & likeness8.0/102.5/10
Anatomy & construction5.5/100.5/10
Space & placement5.5/103.0/10
Light & reflections6.5/101.0/10
Purposeful detail6.0/100.5/10
Artistry & character5.0/101.0/10
Materials & effects5.5/100.5/10
Visual integrity7.5/103.0/10

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.

Kolibri-1

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.

Kolibri-1

Clean shapes and a readable coral platform provide basic graphic clarity, but the animal construction remains fragmented. A recognizable raccoon riding the dog's back, connected steering and convincing water contact are not demonstrated. Sparse detail, flat subjects and absent movement effects support retaining the baseline category assessments.

Score breakdown

CategoryGPT-6.1 Terra LowKolibri-1
Task & likeness6.5/101.5/10
Anatomy & construction5.0/101.0/10
Space & placement5.5/101.0/10
Light & reflections4.5/100.0/10
Purposeful detail6.0/100.5/10
Artistry & character5.0/100.5/10
Materials & effects5.0/100.5/10
Visual integrity6.0/103.5/10

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.

Kolibri-1

Clean shapes and aligned wheels establish a readable schematic scene. Pelican likeness, riding support and bicycle mechanics remain substantially unresolved. Sparse detail and flat surfaces limit expression and volume. Strong edge and fill integrity is a separate success and does not repair the construction.

Score breakdown

CategoryGPT-6.1 Terra LowKolibri-1
Task & likeness7.0/101.5/10
Anatomy & construction5.5/101.5/10
Space & placement6.0/101.5/10
Light & reflections5.5/103.0/10
Purposeful detail6.5/101.5/10
Artistry & character6.0/101.0/10
Materials & effects6.0/101.0/10
Visual integrity6.0/103.5/10

Benchmark task

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