STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6 Luna vs Iceman Contributor

GPT-6 Luna leads Iceman Contributor by 19.9 points on StealthMark, 39.1 to 19.2. It leads on all 9 benchmarks. GPT-6 Luna scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

See the difference ↘
All results ↗
Model guide ↗

Overall StealthMark

39.1/100Overall rank 35/53
19.2/100Overall rank 47/53

General Intelligence

31.3/100
11.7/100

Visual Intelligence

52.0/100
31.0/100

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

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6 Luna
  • Iceman Contributor
  • Other models
  • Median

DATASHEET

Specs and pricing

GPT-6 Luna scores higher on StealthMark and runs 2.8× faster in our speed test.

  • GPT-6 Luna
  • Iceman Contributor
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6 Luna: $0.50$0.10 inputIceman Contributor: No list price
Context windowTokens per request, max output below
GPT-6 Luna: 1.05M128K max outputIceman Contributor: Not published
Output speedTokens per second, our measurement
GPT-6 Luna: 1312.8× fastertokens/sIceman Contributor: 46tokens/s
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 Luna ↗

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 Luna 29.8/100Rank 32/47

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

Iceman Contributor 3.2/100Rank 47/47

Survived 0 of 3
Foresight: complete playing field
Level 31 ptsTurn 7 / 20

Points per level

LevelGPT-6 LunaIceman Contributor
Level 1Second Thoughts
15 ptsOut of lives
0 ptsOut of lives
Level 2Pressure Pot
5 ptsOut of lives
3 ptsOut of lives
Level 3Hide or Flight
6 ptsOut of lives
1 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 Luna 44.0/100Rank 25/48

Cleared 4 of 5
Latch: complete playing field
Level 513 ptsTurn 15 / 40

Iceman Contributor 3.6/100Rank 44/48

Cleared 1 of 5
Latch: complete playing field
Level 55 ptsTurn 25 / 40

Points per level

LevelGPT-6 LunaIceman Contributor
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
8.8 ptsClearedFinished early · 1 beacon left
2.8 ptsFinished early
Level 3Relay vault
17 ptsCleared1 beacon left
2.2 ptsFinished early
Level 4Passing bay
15.8 ptsClearedFinished early · 3 beacons left
4 ptsFinished early
Level 5Second thoughts
13 ptsFinished early
5 ptsFinished early

Newton's Mirror

Same task instructions

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

The judgment

GPT-6 Luna

The schematic scene supports the paint contact order and compact paint scale. Its low, undersized main sphere and incorrectly placed wall images depart from the reference geometry. A few shrinking wall images provide limited optical organization, while absent lateral recursion and outer chains, broad sphere ribbons and isolated panel highlights leave most nested room and emitter mapping undeveloped.

Iceman Contributor

The image provides limited evidence through rounded volume, faint wall strips and floor echoes. Its main sphere is small and low, the paint beads do not establish the required interaction history, and most of the defining mirror structure is missing.

Score breakdown

CategoryGPT-6 LunaIceman Contributor
State at 600 ms22.0/250.5/25
Camera and placement3.5/152.5/15
Reflections5.0/1207.5/120
Materials and scale7.0/103.0/10
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 Luna

Sixfold symmetry, pale coloring and six outward-facing heads establish the motif. However, every neck floats clear of the knot. Squared outer sections replace the required semicircular lobes, and the large stepped opening lacks a regular hexagonal contour. Repeated scales and soft shading suggest skin, but translucent crossings and doubled edges weaken the living, interwoven construction.

Iceman Contributor

The crystal crown, cyan eyes and blue faceting communicate an icy fantasy character. Anatomical readability is substantially weaker: the ringed torso, crowded facial construction and fingerless appendages do not resolve the requested childlike crouch or pouncing gesture. Sparse surface detail and shallow shading further limit the result.

Score breakdown

CategoryGPT-6 LunaIceman Contributor
Task & likeness4.5/104.0/10
Anatomy & construction3.5/103.0/10
Space & placement5.5/104.0/10
Light & reflections5.0/104.5/10
Purposeful detail5.0/104.0/10
Artistry & character5.0/104.5/10
Materials & effects5.0/104.5/10
Visual integrity4.5/104.0/10

Benchmark task

GPT-6 Luna

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.

Iceman Contributor

Character scenes test expression, anatomy, materials and coherent visual construction.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

GPT-6 Luna

The dark veil, crossed arms, restrained smile and layered landscape clearly evoke Mona Lisa. Clean contours and muted colors create a coherent illustration. Replication is limited by enlarged, outlined eyes, simplified facial volume, broad shoulders and indistinct overlapping hands. Gradients suggest depth, but lack the original's subtle painterly transitions.

Iceman Contributor

The portrait retains a dark silhouette against an earthy landscape, but replication is weak. The frontal body, elongated facial proportions and undifferentiated hands lose the reference's defining pose and likeness. Basic gradients and layered hills provide some coherence, with little anatomical or painterly detail.

Score breakdown

CategoryGPT-6 LunaIceman Contributor
Task & likeness4.5/101.5/10
Anatomy & construction4.0/101.5/10
Space & placement5.5/102.5/10
Light & reflections5.0/102.0/10
Purposeful detail5.0/102.0/10
Artistry & character4.5/102.0/10
Materials & effects5.0/102.0/10
Visual integrity6.0/103.0/10

Benchmark task

An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.

Beach

Different task instructions

Creativity, perspective and visual beauty.

The judgment

GPT-6 Luna

The warm sky, layered sea and framing palms create an appealing beach composition. Animals, birds, toys and reflected sunlight fulfill the brief. Human anatomy remains schematic, and simplified figures offer limited expression. Missing shadows and the dolphin's splashless jump weaken physical grounding, while clean silhouettes and readable small details support the illustration.

Iceman Contributor

A coherent sunset beach with recognizable animals, playful details and effective palm framing. Connected silhouettes and layered scenery support modest construction and placement credit. Jointless figures, limited foreshortening and an inadequately separated sun and reflection keep the execution basic despite its attractive color.

Score breakdown

CategoryGPT-6 LunaIceman Contributor
Task & likeness7.5/107.0/10
Anatomy & construction5.0/103.5/10
Space & placement7.5/106.0/10
Light & reflections5.0/104.0/10
Purposeful detail7.0/105.5/10
Artistry & character5.0/103.5/10
Materials & effects6.5/104.5/10
Visual integrity6.0/105.0/10

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

Ground Truth

Different task instructions

Physical reasoning, light and visual reconstruction.

The judgment

GPT-6 Luna

This benchmark has not been assessed yet.

Iceman Contributor

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

Different task instructions

Scene composition and interacting subjects.

The judgment

GPT-6 Luna

Expressive faces, warm sunset colors and clean silhouettes create an appealing illustration. The raccoon sits on the dog's back, but the dog's grip and steering linkage remain unclear. The broad hull resembles a speedboat, and flat shading, absent sun reflections and modest water displacement limit depth and motion.

Iceman Contributor

The sunset palette and red hull establish an appealing setting, but the central interaction remains unresolved. Overlapping bodies obscure the dog, supported seating is unclear, and no readable paw-to-control grip demonstrates steering. Simple construction, weak environmental lighting and loosely described spray limit depth and finish.

Score breakdown

CategoryGPT-6 LunaIceman Contributor
Task & likeness8.0/102.0/10
Anatomy & construction5.5/103.0/10
Space & placement7.5/103.0/10
Light & reflections6.0/104.0/10
Purposeful detail7.0/103.5/10
Artistry & character5.5/102.5/10
Materials & effects6.5/104.0/10
Visual integrity5.0/102.5/10

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

Different task instructions

Subject construction and spatial relationships.

The judgment

GPT-6 Luna

The pelican’s distinctive bill and the coordinated vintage poster palette make an appealing illustration. Circular wheels, orderly spokes and clean lettering strengthen the design. Riding mechanics are less convincing: neither wing reaches the handlebars, pedal contact is ambiguous, and the drivetrain is incomplete. The wheels sit against water without a clear supporting surface. Flat lighting limits volume.

Iceman Contributor

A recognizable pelican and bicycle sit within an appealing sunset composition. Feather contours, bill shape and atmospheric colour provide character, but disconnected-looking leg origins, unclear pedal contact and unresolved steering weaken the central riding action. Consistent wheel alignment establishes a side view without resolving the rider's support.

Score breakdown

CategoryGPT-6 LunaIceman Contributor
Task & likeness8.0/104.0/10
Anatomy & construction5.0/103.5/10
Space & placement6.5/103.5/10
Light & reflections6.5/105.0/10
Purposeful detail7.5/104.5/10
Artistry & character6.5/103.5/10
Materials & effects6.5/104.0/10
Visual integrity7.0/103.0/10

Benchmark task

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