STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Gemma 4 31B vs GPT-6.1 Terra Low

GPT-6.1 Terra Low leads Gemma 4 31B by 15.5 points on StealthMark, 41.3 to 25.8. It leads on 8 of 9 benchmarks, including both games, and Gemma 4 31B on 1. 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

25.8/100Overall rank 46/55
41.3/100Overall rank 35/55

General Intelligence

19.1/100
34.3/100

Visual Intelligence

36.7/100
53.1/100

Open or local

Local modelOpen model · Apache 2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Gemma 4 31B
  • GPT-6.1 Terra Low
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Gemma 4 31B
  • GPT-6.1 Terra Low
  • Other models
  • Median
PricePer 1M output tokens, input below
Gemma 4 31B: $0.40$0.14 inputGPT-6.1 Terra Low: No list price
Context windowTokens per request, max output below
Gemma 4 31B: 256KGPT-6.1 Terra Low: Not published
Output speedTokens per second, our measurement
Gemma 4 31B: 116tokens/sGPT-6.1 Terra Low: Not measured
SizeTotal and active parameters
Gemma 4 31B: 30.7BAll activeEstimatedGPT-6.1 Terra Low: Not disclosed
Developer
Google DeepMindNot published
Released
2 Apr 2026Not published
Origin
United StatesNot published
Input → output
Text, image → textNot published
Architecture
Dense multimodal transformer with interleaved sliding-window and global attentionNot published

Full datasheets, every price and sourceGemma 4 31B ↗

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.

Gemma 4 31B 30.2/100Rank 31/51

Survived 0 of 3
Foresight: complete playing field
Level 38 ptsTurn 15 / 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

LevelGemma 4 31BGPT-6.1 Terra Low
Level 1Second Thoughts
9 ptsOut of lives
4 ptsOut of lives
Level 2Pressure Pot
6 ptsOut of lives
8 ptsOut of lives
Level 3Hide or Flight
8 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.

Gemma 4 31B 26.6/100Rank 43/524 of 5 levels

4 of 5 played
Latch: complete playing field
Level 42.2 ptsTurn 39 / 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

LevelGemma 4 31BGPT-6.1 Terra Low
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9 ptsCleared
9.2 ptsCleared
Level 3Relay vault
13.2 ptsFinished early
18.8 ptsCleared
Level 4Passing bay
2.2 ptsFinished early
10.2 ptsFinished early
Level 5Second thoughts
Not played
20.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Gemma 4 31B

The sphere's volume, separate airborne black blob and vertical color ordering are readable. The large, low sphere, plain surrounding planes and absent nested optical imagery leave the central geometric and reflection requirements unsupported. Paint contact and transport remain unresolved. Material credit recognizes the visible convex shading, highlights and distinct surface colors while retaining deductions for the schematic finish and oversized blobs.

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

CategoryGemma 4 31BGPT-6.1 Terra Low
State at 600 ms11.0/2522.0/25
Camera and placement3.0/154.0/15
Reflections0.0/12010.0/120
Materials and scale5.5/106.0/10
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

Different task instructions

Visual construction and creative interpretation.

The judgment

Gemma 4 31B

A clean, appealing luminous mascot with coherent body continuity and a readable jar-hugging pose. Rounded highlights, smooth gradients and balanced framing work well. The teardrop silhouette, modest eyes and nearly even grin only partly satisfy the character brief; sparse jar construction and simple geometry limit sophistication.

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

CategoryGemma 4 31BGPT-6.1 Terra Low
Task & likeness6.0/104.0/10
Anatomy & construction6.0/103.5/10
Space & placement7.5/104.5/10
Light & reflections6.5/105.5/10
Purposeful detail5.5/105.5/10
Artistry & character5.0/105.0/10
Materials & effects6.5/105.5/10
Visual integrity7.5/104.0/10

Benchmark task

Gemma 4 31B

A small luminous creature proudly holding an empty glass jar tests expression, transparent materials and the balance of character and prop.

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.

Mona Lisa

Same task instructions

Precise visual recall and portrait reconstruction.

The judgment

Gemma 4 31B

The portrait is recognizable through its silhouette, palette and smile, with clean execution of simple shapes. Replication remains weak: the face and pose differ markedly, hands become fingerless ovals, clothing lacks construction, and the landscape loses its atmospheric detail. Basic gradients provide limited volume.

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

CategoryGemma 4 31BGPT-6.1 Terra Low
Task & likeness3.0/105.0/10
Anatomy & construction4.0/104.5/10
Space & placement4.0/105.0/10
Light & reflections3.5/106.0/10
Purposeful detail2.0/105.0/10
Artistry & character3.5/105.5/10
Materials & effects2.5/105.0/10
Visual integrity5.5/106.0/10

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

Gemma 4 31B

A coherent beach illustration with clean silhouettes, a sweeping shoreline and an effective sunset palette. Requested subjects are recognizable, but primitive animal construction, sparse detail, unsupported palm placement and schematic reflections limit drawing sophistication and physical credibility.

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

CategoryGemma 4 31BGPT-6.1 Terra Low
Task & likeness5.0/108.0/10
Anatomy & construction2.0/105.5/10
Space & placement5.0/105.5/10
Light & reflections2.5/106.5/10
Purposeful detail2.0/106.0/10
Artistry & character2.0/105.0/10
Materials & effects2.0/105.5/10
Visual integrity5.0/107.5/10

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

Gemma 4 31B

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

Gemma 4 31B

Clean, simple silhouettes communicate a raccoon riding on a dog. Limited animal specificity, absent steering controls and a flat platform weaken the requested scene. Small facial marks provide purposeful detail, while unresolved support, flat lighting and schematic water restrict physical coherence. Primitive but coherent construction supports basic drawing quality.

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

CategoryGemma 4 31BGPT-6.1 Terra Low
Task & likeness2.5/106.5/10
Anatomy & construction3.0/105.0/10
Space & placement4.0/105.5/10
Light & reflections1.0/104.5/10
Purposeful detail2.5/106.0/10
Artistry & character2.5/105.0/10
Materials & effects2.0/105.0/10
Visual integrity7.0/106.0/10

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

Gemma 4 31B

A clean, readable illustration with balanced placement and coherent basic geometry. The sky gradient and ground shadow establish diffuse illumination. Primitive shapes and sparse detail limit artistry, while unclear leg attachment, missing pedal contact and unresolved steering weaken the riding action.

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

CategoryGemma 4 31BGPT-6.1 Terra Low
Task & likeness4.0/107.0/10
Anatomy & construction3.0/105.5/10
Space & placement4.5/106.0/10
Light & reflections3.0/105.5/10
Purposeful detail3.0/106.5/10
Artistry & character3.0/106.0/10
Materials & effects4.0/106.0/10
Visual integrity4.5/106.0/10

Benchmark task

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