STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Gemma 4 26B A4B vs GPT-6.1 Terra

GPT-6.1 Terra leads Gemma 4 26B A4B by 43.9 points on StealthMark, 60.4 to 16.5. It leads on all 9 benchmarks. GPT-6.1 Terra scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

16.5/100Overall rank 51/54
60.4/100Overall rank 9/54

General Intelligence

9.4/100
58.0/100

Visual Intelligence

28.9/100
64.9/100

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

  • Gemma 4 26B A4B

Open or local

Local modelOpen model · Apache 2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Gemma 4 26B A4B
  • GPT-6.1 Terra
  • Other models
  • Median

DATASHEET

Specs and pricing

Gemma 4 26B A4B is 17× cheaper per output token. GPT-6.1 Terra scores higher on StealthMark and takes 4× more context.

  • Gemma 4 26B A4B
  • GPT-6.1 Terra
  • Other models
  • Median
PricePer 1M output tokens, input below
Gemma 4 26B A4B: $0.3017× cheaper$0.09 inputGPT-6.1 Terra: $5$1 input
Context windowTokens per request, max output below
Gemma 4 26B A4B: 256KGPT-6.1 Terra: 1.05M4× larger128K max output
Output speedTokens per second, our measurement
Gemma 4 26B A4B: 95tokens/sGPT-6.1 Terra: Not measured
SizeTotal and active parameters
Gemma 4 26B A4B: 25.2B3.8B activeGPT-6.1 Terra: Not disclosed
Developer
Google DeepMindOpenAI
Released
2 Apr 202626 Oct 2026
Origin
United StatesBoth
Input → output
Text, image → textBoth
Architecture
Mixture-of-Experts multimodal transformer with interleaved sliding-window and global attentionNot published

Full datasheets, every price and sourceGemma 4 26B A4B ↗GPT-6.1 Terra ↗

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 26B A4B 4.1/100Rank 49/50

Survived 0 of 3
Foresight: complete playing field
Level 32 ptsTurn 9 / 20

GPT-6.1 Terra 62.0/100Rank 9/50

Survived 2 of 3
Foresight: complete playing field
Level 315 ptsTurn 20 / 20

Points per level

LevelGemma 4 26B A4BGPT-6.1 Terra
Level 1Second Thoughts
3 ptsOut of lives
21 ptsSurvived
Level 2Pressure Pot
2 ptsOut of lives
9 ptsOut of lives
Level 3Hide or Flight
2 ptsOut of lives
15 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 26B A4B 4.5/100Rank 44/51

Cleared 2 of 5
Latch: complete playing field
Level 53 ptsTurn 40 / 40

GPT-6.1 Terra 77.7/100Rank 12/51

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

Points per level

LevelGemma 4 26B A4BGPT-6.1 Terra
Level 1Hold the door
3 ptsCleared1 beacon left
5.2 ptsCleared
Level 2Crossfeed
6.2 ptsFinished early
9.8 ptsCleared
Level 3Relay vault
15.2 ptsClearedFinished early · 3 beacons left
19.2 ptsCleared
Level 4Passing bay
11.8 ptsFinished early
17.8 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
3 ptsOut of turns
20.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Gemma 4 26B A4B

Separate airborne black and contact-compatible paint flattening earn partial state credit. Settlement, adhesion and differentiated paint transport remain unresolved. The enlarged, low sphere and thin lamp strip substantially depart from the required camera, while the defining mirror structure is missing. Weak material appearance and oversized black paint limit material credit. The retained base total is 18/170; the floor-damage reward is 0, giving 18/180.

GPT-6.1 Terra

The sphere, airborne black and first reflected silhouettes preserve important geometry within the portrait frame. Paint deformation, contact order and forward transport are supported, with a small crimson endpoint overshoot. Major optical omissions dominate: short finite reflection sequences and smooth bands replace extensive, spatially ordered mirror imagery. Dark gloss and crisp upper emitter shapes provide partial material credit.

Score breakdown

CategoryGemma 4 26B A4BGPT-6.1 Terra
State at 600 ms10.0/2523.0/25
Camera and placement2.0/1511.0/15
Reflections0.0/12033.0/120
Materials and scale2.5/107.5/10
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 26B A4B

An appealing, readable sparkle-creature with luminous colour and expressive eyes. Simple geometric construction limits sophistication, while sharp body points, ambiguous hand contact and a minimally resolved jar weaken the requested soft, plump character and treasure-presenting pose.

GPT-6.1 Terra

A balanced serpent emblem with six attached outward heads, delicate scales and softly rounded bodies. Its compact silhouette reads clearly, but central routing does not establish every alternating crossing or crisp inward corner. Repetitive texture, limited facial anatomy and weak contact shadows constrain its organic character.

Score breakdown

CategoryGemma 4 26B A4BGPT-6.1 Terra
Task & likeness5.5/107.5/10
Anatomy & construction4.5/106.5/10
Space & placement6.0/106.5/10
Light & reflections6.0/106.0/10
Purposeful detail5.5/106.5/10
Artistry & character4.0/106.5/10
Materials & effects6.0/106.0/10
Visual integrity7.0/106.0/10

Benchmark task

Gemma 4 26B A4B

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

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 26B A4B

The centered dark-haired portrait provides a loose reference cue, but its elongated, nearly featureless face and undifferentiated torso fall far short of replication. Crossed hands, the subtle smile, clothing structure and landscape are unresolved. Clean silhouettes and soft gradients provide limited coherence.

GPT-6.1 Terra

A recognizable interpretation with developed facial shading, shaped sleeve folds and purposeful small features. These strengths support modest upward calibration, while the frontal torso, elongated proportions, schematic finger joints and unresolved seated support keep replication and construction uneven.

Score breakdown

CategoryGemma 4 26B A4BGPT-6.1 Terra
Task & likeness0.5/105.5/10
Anatomy & construction2.0/106.5/10
Space & placement1.0/104.5/10
Light & reflections2.0/106.5/10
Purposeful detail1.0/106.0/10
Artistry & character2.0/106.0/10
Materials & effects1.0/106.0/10
Visual integrity4.5/106.5/10

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 26B A4B

A clean, balanced sunset scene demonstrates the beach, birds and a centered reflection. Animals and play receive only minimal treatment. Coherent layers and controlled gradients support readability, but unresolved aquatic anatomy, sparse details and weak surface modeling keep the drawing basic.

GPT-6.1 Terra

A coherent sunset illustration with clear prompt fulfillment, controlled framing and varied, purposeful small details. Simplified joints, frontal staging, flattened animal forms and weakly directional shadows limit its anatomical, spatial and physical sophistication.

Score breakdown

CategoryGemma 4 26B A4BGPT-6.1 Terra
Task & likeness3.5/108.5/10
Anatomy & construction2.0/107.5/10
Space & placement3.5/106.5/10
Light & reflections5.0/105.5/10
Purposeful detail1.0/107.5/10
Artistry & character1.5/107.0/10
Materials & effects2.0/106.5/10
Visual integrity6.0/107.5/10

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 26B A4B

This benchmark has not been assessed yet.

GPT-6.1 Terra

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 26B A4B

The animal stack is recognizable, and clean silhouettes support a basic illustration. Steering is not depicted, while the craft's construction and water contact remain unresolved. Sparse anatomical and material detail limit the finish. The sky gradient and glow provide atmospheric lighting, but the subjects lack corresponding modeling.

GPT-6.1 Terra

A coherent cartoon with expressive animals, readable steering and a clear wake. Fine facial and hull details reward inspection. The main limits are the boatlike craft, simplified joints, weakly braced frontal raccoon and minimal directional lighting or material depth.

Score breakdown

CategoryGemma 4 26B A4BGPT-6.1 Terra
Task & likeness2.5/106.5/10
Anatomy & construction2.5/105.5/10
Space & placement4.0/106.0/10
Light & reflections3.5/105.0/10
Purposeful detail2.5/107.0/10
Artistry & character3.0/106.0/10
Materials & effects2.0/106.0/10
Visual integrity7.0/107.0/10

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 26B A4B

A clean, balanced icon suggests a pelican riding a bicycle. Continuous contours and restrained colors support its finish, but the abbreviated bill, undifferentiated body, unresolved riding contacts and incomplete bicycle mechanism limit likeness and construction. Sparse detail and flat lighting keep the drawing basic despite its clarity.

GPT-6.1 Terra

A coherent pelican cyclist with expressive proportions, purposeful feather detail and developed bicycle machinery. Continuous body contours, aligned wheels and readable pedal contacts support the scene. Simplified articulation, shallow modelling and an unresolved steering connection limit construction and placement.

Score breakdown

CategoryGemma 4 26B A4BGPT-6.1 Terra
Task & likeness3.0/107.0/10
Anatomy & construction3.0/107.0/10
Space & placement5.0/106.0/10
Light & reflections3.0/105.5/10
Purposeful detail3.0/107.0/10
Artistry & character2.5/106.5/10
Materials & effects2.5/105.5/10
Visual integrity5.0/106.0/10

Benchmark task

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