STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Iceman Contributor vs Step 5 Preview

Step 5 Preview leads Iceman Contributor by 19.8 points on StealthMark, 39.0 to 19.2. It leads on 7 of 9 benchmarks, including both games, and Iceman Contributor on 2. Step 5 Preview scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.

See the difference ↘
Model guide ↗
All results ↗

Overall StealthMark

19.2/100Overall rank 47/53
39.0/100Overall rank 36/53

General Intelligence

11.7/100
37.1/100

Visual Intelligence

31.0/100
41.9/100

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
  • Step 5 Preview
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Iceman Contributor
  • Step 5 Preview
  • Other models
  • Median
Context windowTokens per request, max output below
Iceman Contributor: Not publishedStep 5 Preview: 1M
Output speedTokens per second, our measurement
Iceman Contributor: 46tokens/sStep 5 Preview: Not measured
SizeTotal and active parameters
Iceman Contributor: Not disclosedStep 5 Preview: 600B27B active
Developer
Not publishedStepFun
Input → output
Not publishedText, image, video → text
Architecture
Not publishedSparse mixture-of-experts; 92 layers (88 MoE), 352 routed experts with 8 selected per token plus a shared expert; grouped-query attention with 512-token sliding windows and full attention every fourth layer; 3 multi-token-prediction layers; vision tower for image and video input

Full datasheets, every price and sourceStep 5 Preview ↗

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 49/49

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

Step 5 Preview 59.9/100Rank 42/491 of 3 levels

1 of 3 played
Foresight: complete playing field
Level 122 ptsTurn 28 / 28

Points per level

LevelIceman ContributorStep 5 Preview
Level 1Second Thoughts
0 ptsOut of lives
22 ptsSurvived
Level 2Pressure Pot
3 ptsOut of lives
Pending
Level 3Hide or Flight
1 ptsOut of lives
Pending

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 46/50

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

Step 5 Preview 40.7/100Rank 28/50

Cleared 4 of 5
Latch: complete playing field
Level 515 ptsTurn 35 / 40

Points per level

LevelIceman ContributorStep 5 Preview
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
2.8 ptsFinished early
9 ptsCleared
Level 3Relay vault
2.2 ptsFinished early
18.6 ptsCleared
Level 4Passing bay
4 ptsFinished early
15.6 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
5 ptsFinished early
15 ptsFinished early

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.

Step 5 Preview

The main sphere, airborne black and small colored features occupy broadly appropriate positions. Most of the defining mirror system is absent, and paint interaction remains only partially supported. The small paint features do not visibly establish a separate volume-scale violation.

Score breakdown

CategoryIceman ContributorStep 5 Preview
State at 600 ms0.5/2520.0/25
Camera and placement2.5/1513.5/15
Reflections7.5/12020.0/120
Materials and scale3.0/107.0/10
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.

Step 5 Preview

A charming diagonal climber and warm palette communicate the central idea. Simple rounded construction, crowded limb counting, uncertain footholds and an unattached upper shelf limit its physical coherence. Growth bands and the yarn trail add specificity, but the requested material distinctions and unravelled bootie remain underdeveloped.

Score breakdown

CategoryIceman ContributorStep 5 Preview
Task & likeness4.0/106.0/10
Anatomy & construction3.0/104.5/10
Space & placement4.0/105.0/10
Light & reflections4.5/105.5/10
Purposeful detail4.0/105.5/10
Artistry & character4.5/105.0/10
Materials & effects4.5/106.0/10
Visual integrity4.0/105.0/10

Benchmark task

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

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.

Step 5 Preview

A recognizable, coherent simplification with purposeful facial contours and differentiated fingers. These provide more construction and detail than the broad silhouette alone suggests. The oversized face, frontal seated pose, unresolved wrists and sparse landscape still substantially limit likeness, depth and finish.

Score breakdown

CategoryIceman ContributorStep 5 Preview
Task & likeness1.5/104.0/10
Anatomy & construction1.5/104.0/10
Space & placement2.5/104.0/10
Light & reflections2.0/103.5/10
Purposeful detail2.0/104.0/10
Artistry & character2.0/104.0/10
Materials & effects2.0/103.0/10
Visual integrity3.0/103.5/10

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.

Step 5 Preview

A recognizable sunset beach with clear warm-cool contrast and playful accessories. Basic animal construction, shallow foreground placement and schematic reflections limit spatial and physical credibility. Sparse descriptive detail and abruptly ended sky bands constrain the finish.

Score breakdown

CategoryIceman ContributorStep 5 Preview
Task & likeness7.0/104.0/10
Anatomy & construction3.5/103.0/10
Space & placement6.0/103.5/10
Light & reflections4.0/103.5/10
Purposeful detail5.5/103.0/10
Artistry & character3.5/103.0/10
Materials & effects4.5/103.5/10
Visual integrity5.0/104.0/10

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

Iceman Contributor

This benchmark has not been assessed yet.

Step 5 Preview

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.

Step 5 Preview

Recognizable animals, a bright palette and identifying accessories support a basic cartoon. Primitive anatomy, partial seated support, unresolved steering and weak hull-water contact limit the central action. Lighting and spray provide atmosphere without establishing convincing physical depth.

Score breakdown

CategoryIceman ContributorStep 5 Preview
Task & likeness2.0/104.0/10
Anatomy & construction3.0/104.5/10
Space & placement3.0/103.0/10
Light & reflections4.0/103.5/10
Purposeful detail3.5/104.0/10
Artistry & character2.5/103.5/10
Materials & effects4.0/103.0/10
Visual integrity2.5/103.0/10

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.

Step 5 Preview

The pelican and bicycle are recognizable, with a pleasant palette and basic diffuse shading. The riding relationship fails physically: the bird is unsupported, the front wheel is unmounted, and pedalling is unresolved. Simple geometric construction and sparse material treatment further limit the drawing.

Score breakdown

CategoryIceman ContributorStep 5 Preview
Task & likeness4.0/103.0/10
Anatomy & construction3.5/103.0/10
Space & placement3.5/103.0/10
Light & reflections5.0/103.0/10
Purposeful detail4.5/104.0/10
Artistry & character3.5/103.0/10
Materials & effects4.0/103.0/10
Visual integrity3.0/102.0/10

Benchmark task

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