STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Iceman Contributor vs Nemotron 3 Ultra

Iceman Contributor leads Nemotron 3 Ultra by 2.5 points on StealthMark, 19.2 to 16.7. It leads on 6 of 9 benchmarks and Nemotron 3 Ultra on 3, including both games. Iceman Contributor scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
Model guide ↗
All results ↗

Overall StealthMark

19.2/100Overall rank 47/53
16.7/100Overall rank 49/53

General Intelligence

11.7/100
12.2/100

Visual Intelligence

31.0/100
26.5/100

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

  • Iceman Contributor
  • Nemotron 3 Ultra
  • Other models
  • Median

DATASHEET

Specs and pricing

Iceman Contributor scores higher on StealthMark. Nemotron 3 Ultra runs 3× faster in our speed test.

  • Iceman Contributor
  • Nemotron 3 Ultra
  • Other models
  • Median
PricePer 1M output tokens, input below
Iceman Contributor: No list priceNemotron 3 Ultra: $2.40$0.60 input
Context windowTokens per request, max output below
Iceman Contributor: Not publishedNemotron 3 Ultra: 1M
Output speedTokens per second, our measurement
Iceman Contributor: 46tokens/sNemotron 3 Ultra: 1393× fastertokens/s
SizeTotal and active parameters
Iceman Contributor: Not disclosedNemotron 3 Ultra: 550B55B active
Developer
Not publishedNVIDIA
Released
Not published4 Jun 2026
Origin
Not publishedUnited States
Input → output
Not publishedText → text
Architecture
Not publishedLatentMoE: Mamba-2 + MoE + Attention hybrid with Multi-Token Prediction

Full datasheets, every price and sourceNemotron 3 Ultra ↗

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.

Iceman Contributor 3.2/100Rank 47/47

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

Nemotron 3 Ultra 16.9/100Rank 41/47

Survived 0 of 3
Foresight: complete playing field
Level 38 ptsTurn 17 / 20

Points per level

LevelIceman ContributorNemotron 3 Ultra
Level 1Second Thoughts
0 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
3 ptsOut of lives
4 ptsOut of lives
Level 3Hide or Flight
1 ptsOut of lives
8 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.

Iceman Contributor 3.6/100Rank 44/48

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

Nemotron 3 Ultra 5.0/100Rank 42/484 of 5 levels

4 of 5 played
Latch: complete playing field
Level 413.8 ptsTurn 21 / 40

Points per level

LevelIceman ContributorNemotron 3 Ultra
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
2.8 ptsFinished early
3.2 ptsFinished early
Level 3Relay vault
2.2 ptsFinished early
7.4 ptsFinished early
Level 4Passing bay
4 ptsFinished early
13.8 ptsFinished early
Level 5Second thoughts
5 ptsFinished early
Not played

Newton's Mirror

Same task instructions

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

The judgment

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.

Nemotron 3 Ultra

The candidate establishes a separate airborne black blob and partial crimson overlap, but leaves the paint interaction history and settled support unresolved. Its main silhouette, black placement and lamp projection depart substantially from the required camera geometry. A few faint reflection hints provide little support for the extensive mirror system, while the compact paint volumes are visibly disproportionate.

Score breakdown

CategoryIceman ContributorNemotron 3 Ultra
State at 600 ms0.5/252.0/25
Camera and placement2.5/153.5/15
Reflections7.5/1204.5/120
Materials and scale3.0/103.0/10
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

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.

Nemotron 3 Ultra

An endearing mechanical creature is clearly framed, with expressive amber eyes and readable segmented arms. The shell resembles layered green plates more than a deep coiled spiral. Detached-looking construction, absent working contacts and patchy rendering leave the central assembly action substantially unresolved.

Score breakdown

CategoryIceman ContributorNemotron 3 Ultra
Task & likeness4.0/104.0/10
Anatomy & construction3.0/104.0/10
Space & placement4.0/105.5/10
Light & reflections4.5/105.0/10
Purposeful detail4.0/104.0/10
Artistry & character4.5/103.0/10
Materials & effects4.5/104.0/10
Visual integrity4.0/104.5/10

Benchmark task

Iceman Contributor

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

Nemotron 3 Ultra

A hovering mechanical nautilus tests spiral construction, connected mechanical forms and contrasting metal and illuminated surfaces.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

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.

Nemotron 3 Ultra

The centered silhouette provides basic organization, but multicolored mottling and geometric overlays leave the portrait unresolved. No readable face, crossed hands, clothing or landscape establishes Mona Lisa replication. Texture and transparency offer limited visual effects without coherent anatomy, lighting or material distinctions.

Score breakdown

CategoryIceman ContributorNemotron 3 Ultra
Task & likeness1.5/100.5/10
Anatomy & construction1.5/100.0/10
Space & placement2.5/101.0/10
Light & reflections2.0/100.5/10
Purposeful detail2.0/100.5/10
Artistry & character2.0/101.5/10
Materials & effects2.0/100.0/10
Visual integrity3.0/100.5/10

Benchmark task

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

Beach

Different task instructions

Creativity, perspective and visual beauty.

The judgment

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.

Nemotron 3 Ultra

A recognizable beach illustration with appealing warm-cool contrast, readable layers and mostly clean shapes. Unresolved seat construction, schematic animals and broad geometric foliage give it an elementary finish. Weakly coordinated reflections and limited material differentiation further constrain depth and atmosphere.

Score breakdown

CategoryIceman ContributorNemotron 3 Ultra
Task & likeness7.0/106.5/10
Anatomy & construction3.5/103.0/10
Space & placement6.0/105.0/10
Light & reflections4.0/101.5/10
Purposeful detail5.5/104.5/10
Artistry & character3.5/103.0/10
Materials & effects4.5/102.5/10
Visual integrity5.0/106.5/10

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

Iceman Contributor

This benchmark has not been assessed yet.

Nemotron 3 Ultra

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

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.

Nemotron 3 Ultra

The masked raccoon, dog and orange craft make the scene recognizable, with an appealing sunset palette. Overlapping bodies obscure the riding relationship, and the dog's connection to the controls remains unresolved. Weak water displacement, inconsistent shading and visible shape artifacts limit the finish. Ambiguous attachments do not establish detached limbs or inverted anatomy.

Score breakdown

CategoryIceman ContributorNemotron 3 Ultra
Task & likeness2.0/103.5/10
Anatomy & construction3.0/101.5/10
Space & placement3.0/104.5/10
Light & reflections4.0/102.0/10
Purposeful detail3.5/103.5/10
Artistry & character2.5/101.5/10
Materials & effects4.0/103.0/10
Visual integrity2.5/102.0/10

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

Different task instructions

Subject construction and spatial relationships.

The judgment

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.

Nemotron 3 Ultra

A recognizable, playful pelican dominates a readable bicycle scene. Its bill and silhouette succeed, but feet below the pedals and confused drivetrain connections weaken the riding action. Local material modeling adds interest; overlapping contours, repetitive detail and inconsistent shadows leave the illustration basic and uneven.

Score breakdown

CategoryIceman ContributorNemotron 3 Ultra
Task & likeness4.0/104.0/10
Anatomy & construction3.5/103.5/10
Space & placement3.5/103.5/10
Light & reflections5.0/104.0/10
Purposeful detail4.5/105.5/10
Artistry & character3.5/104.0/10
Materials & effects4.0/106.0/10
Visual integrity3.0/103.0/10

Benchmark task

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