STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Fledge Alpha vs GPT-6.1 Terra

GPT-6.1 Terra leads Fledge Alpha by 24.6 points on StealthMark, 60.4 to 35.8. It leads on 6 of the 7 benchmarks with results for both and Fledge Alpha on 1. GPT-6.1 Terra scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
Model guide ↗
All results ↗

Overall StealthMark

35.8/100Overall rank 40/54
60.4/100Overall rank 9/54

General Intelligence

27.1/100
58.0/100

Visual Intelligence

45.2/100
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

  • Fledge AlphaMulti-step reasoning not measured

Open or local

BENCHMARK BY BENCHMARK

Where each model leads

  • Fledge Alpha
  • GPT-6.1 Terra
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Fledge Alpha
  • GPT-6.1 Terra
  • Other models
  • Median
PricePer 1M output tokens, input below
Fledge Alpha: No list priceGPT-6.1 Terra: $5$1 input
Context windowTokens per request, max output below
Fledge Alpha: Not publishedGPT-6.1 Terra: 1.05M128K max output
Output speedTokens per second, our measurement
Fledge Alpha: 63tokens/sGPT-6.1 Terra: Not measured
Developer
Not publishedOpenAI
Released
Not published26 Oct 2026
Origin
Not publishedUnited States
Input → output
Not publishedText, image → text

Full datasheets, every price and sourceGPT-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.

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

LevelFledge AlphaGPT-6.1 Terra
Level 1Second Thoughts
No run
21 ptsSurvived
Level 2Pressure Pot
No run
9 ptsOut of lives
Level 3Hide or Flight
No run
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.

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

LevelFledge AlphaGPT-6.1 Terra
Level 1Hold the door
No run
5.2 ptsCleared
Level 2Crossfeed
No run
9.8 ptsCleared
Level 3Relay vault
No run
19.2 ptsCleared
Level 4Passing bay
No run
17.8 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
No run
20.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Fledge Alpha

The candidate communicates a round metallic sphere, three paint colors and a separate airborne black blob. Its hovering support relationship, displaced framing and unresolved paint interaction limit physical credit. Sparse planar light ghosts and a soft sphere highlight provide little evidence for the required wall/floor repetitions and curved nested mirror imagery.

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

CategoryFledge AlphaGPT-6.1 Terra
State at 600 ms9.0/2523.0/25
Camera and placement5.0/1511.0/15
Reflections7.5/12033.0/120
Materials and scale3.5/107.5/10
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

Fledge Alpha

A coherent, appealing mascot with expressive eyes, a cheerful beak and a readable swept-back silhouette. Its larger forward foot and trailing feathers suggest a running stride, but the upright body, stiff legs and minimally articulated feet limit convincing motion. Clean flat shapes suit the brief, while uneven feather junctions and incomplete cream accents reduce polish.

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

CategoryFledge AlphaGPT-6.1 Terra
Task & likeness7.5/107.5/10
Anatomy & construction6.5/106.5/10
Space & placement7.0/106.5/10
Light & reflections5.5/106.0/10
Purposeful detail6.5/106.5/10
Artistry & character4.0/106.5/10
Materials & effects6.0/106.0/10
Visual integrity6.5/106.0/10

Benchmark task

Fledge Alpha

An eager young seabird running toward the viewer tests expressive anatomy, balance and a convincing forward-moving pose.

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

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Fledge Alpha

A recognizable but basic Mona Lisa reinterpretation with a coherent silhouette and subdued palette. Curtain-like hair obscures much of the face, while elongated facial construction and oversized, minimally articulated hands substantially weaken replication. Soft shading supplies modest volume, but anatomy, landscape depth and purposeful detail remain underdeveloped.

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

CategoryFledge AlphaGPT-6.1 Terra
Task & likeness3.0/105.5/10
Anatomy & construction3.0/106.5/10
Space & placement2.5/104.5/10
Light & reflections2.5/106.5/10
Purposeful detail3.0/106.0/10
Artistry & character3.0/106.0/10
Materials & effects2.5/106.0/10
Visual integrity2.5/106.5/10

Benchmark task

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

Beach

Different task instructions

Creativity, perspective and visual beauty.

The judgment

Fledge Alpha

A cheerful, recognizable sunset beach with a cohesive warm palette and clear accessories. Simple construction, uncertain palm support, an ambiguous upper boundary and schematic reflections limit depth and finish. The scene communicates its subject successfully but lacks the developed forms, lighting and detail of exceptional illustration.

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

CategoryFledge AlphaGPT-6.1 Terra
Task & likeness7.5/108.5/10
Anatomy & construction4.0/107.5/10
Space & placement5.5/106.5/10
Light & reflections5.0/105.5/10
Purposeful detail3.0/107.5/10
Artistry & character3.0/107.0/10
Materials & effects2.5/106.5/10
Visual integrity4.0/107.5/10

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

Fledge Alpha

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

Fledge Alpha

An appealing sunset illustration with recognizable characters and a clear riding action. Color, expression and silhouette are stronger than anatomical construction: overlapping paws obscure support, the dog's steering limb is simplified, and the vehicle controls lack definition. The wake conveys movement, while lighting and water reflections remain decorative.

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

CategoryFledge AlphaGPT-6.1 Terra
Task & likeness8.5/106.5/10
Anatomy & construction5.5/105.5/10
Space & placement7.5/106.0/10
Light & reflections6.5/105.0/10
Purposeful detail7.0/107.0/10
Artistry & character5.5/106.0/10
Materials & effects7.0/106.0/10
Visual integrity4.5/107.0/10

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

Different task instructions

Subject construction and spatial relationships.

The judgment

Fledge Alpha

A clear, cheerful illustration with a recognizable pelican, coherent bicycle silhouette and tidy composition. Simplified leg articulation, steering contact, mechanical detail and lighting keep it at a competent illustrative level.

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

CategoryFledge AlphaGPT-6.1 Terra
Task & likeness8.0/107.0/10
Anatomy & construction6.0/107.0/10
Space & placement6.5/106.0/10
Light & reflections4.5/105.5/10
Purposeful detail5.5/107.0/10
Artistry & character5.0/106.5/10
Materials & effects5.5/105.5/10
Visual integrity6.5/106.0/10

Benchmark task

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