STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6 Sol vs GPT-6.1 Terra Low

GPT-6 Sol leads GPT-6.1 Terra Low by 10.4 points on StealthMark, 51.7 to 41.3. It leads on 7 of 9 benchmarks, including Latch, and GPT-6.1 Terra Low on 2, including Foresight. GPT-6 Sol scores higher on Ground Truth.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

51.7/100Overall rank 14/55
41.3/100Overall rank 35/55

General Intelligence

46.1/100
34.3/100

Visual Intelligence

61.6/100
53.1/100

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6 Sol
  • GPT-6.1 Terra Low
  • Other models
  • Median

DATASHEET

Specs and pricing

  • GPT-6 Sol
  • GPT-6.1 Terra Low
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6 Sol: $10$2 inputGPT-6.1 Terra Low: No list price
Context windowTokens per request, max output below
GPT-6 Sol: 1.05M128K max outputGPT-6.1 Terra Low: Not published
Output speedTokens per second, our measurement
GPT-6 Sol: 91tokens/sGPT-6.1 Terra Low: Not measured
Developer
OpenAINot published
Released
22 Sep 2026Not published
Origin
United StatesNot published
Input → output
Text, image → textNot published

Full datasheets, every price and sourceGPT-6 Sol ↗

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 Sol 30.4/100Rank 30/51

Survived 0 of 3
Foresight: complete playing field
Level 36 ptsTurn 7 / 20

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 SolGPT-6.1 Terra Low
Level 1Second Thoughts
17 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
5 ptsOut of lives
8 ptsOut of lives
Level 3Hide or Flight
6 ptsOut of lives
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 Sol 76.6/100Rank 13/52

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

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 SolGPT-6.1 Terra Low
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.6 ptsCleared
9.2 ptsCleared
Level 3Relay vault
18.4 ptsCleared
18.8 ptsCleared
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
10.2 ptsFinished early
Level 5Second thoughts
20.6 ptsCleared
20.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

GPT-6 Sol

The centered sphere, separate airborne black form and color ordering support scene recognition. Rounded shading and curved rims provide readable volume and gloss. Shrinking side images, a floor counterpart and curved lamp highlights provide isolated reflection cues, but broad bands and sparse repetitions leave nested room imagery, outer chains and ordered emitter mapping unsupported. Vertical framing departs from the prescribed view, while paint contact, transport and solid-metal appearance remain weak or uncertain.

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.

Score breakdown

CategoryGPT-6 SolGPT-6.1 Terra Low
State at 600 ms19.0/2522.0/25
Camera and placement12.0/154.0/15
Reflections8.0/12010.0/120
Materials and scale6.5/106.0/10
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

Same task instructions

Visual construction and creative interpretation.

The judgment

GPT-6 Sol

Six evenly spaced lobes, small outward-facing heads and a regular hexagonal opening make the motif immediately readable. The central angular band merges several intersections, weakening the alternating weave. Pale shading gives modest volume, but scales are sparse and repetitive, crossing shadows are weak, and the heads have limited anatomical definition.

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.

Score breakdown

CategoryGPT-6 SolGPT-6.1 Terra Low
Task & likeness7.5/104.0/10
Anatomy & construction6.5/103.5/10
Space & placement6.5/104.5/10
Light & reflections6.0/105.5/10
Purposeful detail6.5/105.5/10
Artistry & character7.0/105.0/10
Materials & effects5.5/105.5/10
Visual integrity6.0/104.0/10

Benchmark task

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.

Mona Lisa

Same task instructions

Precise visual recall and portrait reconstruction.

The judgment

GPT-6 Sol

The dark clothing, crossed arms, restrained smile and distant landscape establish the Mona Lisa reference. Replication is limited by the oversized, nearly frontal head, schematic eyes and fingerless hand shapes. Soft shading suggests facial volume, but muddy transitions and angular scenery weaken depth and painterly finish.

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.

Score breakdown

CategoryGPT-6 SolGPT-6.1 Terra Low
Task & likeness5.5/105.0/10
Anatomy & construction3.5/104.5/10
Space & placement5.5/105.0/10
Light & reflections6.0/106.0/10
Purposeful detail4.5/105.0/10
Artistry & character5.0/105.5/10
Materials & effects4.5/105.0/10
Visual integrity6.0/106.0/10

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 Sol

A cohesive, appealing beach illustration with framing palms, a warm sunset and a clear reflection path. The turtle, crab, birds and beach ball fulfill the playful brief. Clean silhouettes and restrained colors work well, while simplified anatomy, shallow spatial cues and inconsistent foreground shadows limit depth and finish.

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.

Score breakdown

CategoryGPT-6 SolGPT-6.1 Terra Low
Task & likeness8.5/108.0/10
Anatomy & construction7.0/105.5/10
Space & placement7.0/105.5/10
Light & reflections6.5/106.5/10
Purposeful detail7.0/106.0/10
Artistry & character6.0/105.0/10
Materials & effects6.5/105.5/10
Visual integrity7.5/107.5/10

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 Sol

This benchmark has not been assessed yet.

GPT-6.1 Terra Low

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 Sol

The raccoon rides the dog's back, and the dog's connected foreleg reaches the steering grip. Expressive faces, a cohesive palette and sweeping wake make an appealing illustration. Vehicle construction and seating remain simplified; broad splash ribbons convey speed more convincingly than physical displacement. The sun has little corresponding reflection or effect on the subjects.

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.

Score breakdown

CategoryGPT-6 SolGPT-6.1 Terra Low
Task & likeness7.5/106.5/10
Anatomy & construction6.5/105.0/10
Space & placement7.5/105.5/10
Light & reflections6.0/104.5/10
Purposeful detail7.5/106.0/10
Artistry & character6.5/105.0/10
Materials & effects7.5/105.0/10
Visual integrity8.0/106.0/10

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 Sol

The pelican reads clearly, with an expressive face, generous bill and appealing pastel composition. Spokes, basket weave and feather contours are carefully organized. Both legs connect to the body, though joint definition and pedal contacts are simplified. Consistent wheel placement and a ground shadow establish support; restrained shading gives limited volume.

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.

Score breakdown

CategoryGPT-6 SolGPT-6.1 Terra Low
Task & likeness9.0/107.0/10
Anatomy & construction7.5/105.5/10
Space & placement8.0/106.0/10
Light & reflections7.0/105.5/10
Purposeful detail8.0/106.5/10
Artistry & character8.5/106.0/10
Materials & effects7.0/106.0/10
Visual integrity8.5/106.0/10

Benchmark task

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