STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-6.1 Terra vs Mistral Large 4

GPT-6.1 Terra leads Mistral Large 4 by 17.1 points on StealthMark, 60.4 to 43.3. It leads on 6 of 9 benchmarks, including both games, and Mistral Large 4 on 3. GPT-6.1 Terra scores higher on Newton's Mirror, with its largest category advantage in reflections.

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All results ↗
All results ↗

Overall StealthMark

60.4/100Overall rank 9/54
43.3/100Overall rank 32/54

General Intelligence

58.0/100
34.4/100

Visual Intelligence

64.9/100
58.0/100

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

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-6.1 Terra
  • Mistral Large 4
  • Other models
  • Median

DATASHEET

Specs and pricing

GPT-6.1 Terra scores higher on StealthMark. Mistral Large 4 is 20% cheaper per output token. Both take about 1.05M tokens of context.

  • GPT-6.1 Terra
  • Mistral Large 4
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-6.1 Terra: $5$1 inputMistral Large 4: $4.1820% cheaper$1.36 input
Context windowTokens per request, max output below
GPT-6.1 Terra: 1.05MTied128K max outputMistral Large 4: 1MTied256K max output
Output speedTokens per second, our measurement
GPT-6.1 Terra: Not measuredMistral Large 4: 151tokens/s
SizeTotal and active parameters
GPT-6.1 Terra: Not disclosedMistral Large 4: 1.05T49B active
Developer
OpenAIMistral AI
Released
26 Oct 20266 Oct 2026
Origin
United StatesFrance
Input → output
Text, image → textBoth
Architecture
Not publishedGranular mixture of experts (MoE); multimodal text and image input, text output.

Full datasheets, every price and sourceGPT-6.1 Terra ↗Mistral Large 4 ↗

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

Mistral Large 4 22.0/100Rank 41/50

Survived 0 of 3
Foresight: complete playing field
Level 34 ptsTurn 8 / 20

Points per level

LevelGPT-6.1 TerraMistral Large 4
Level 1Second Thoughts
21 ptsSurvived
1 ptsOut of lives
Level 2Pressure Pot
9 ptsOut of lives
9 ptsOut of lives
Level 3Hide or Flight
15 ptsSurvived
4 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.

GPT-6.1 Terra 77.7/100Rank 12/51

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

Mistral Large 4 49.4/100Rank 26/51

Cleared 5 of 5
Latch: complete playing field
Level 519.8 ptsTurn 31 / 40

Points per level

LevelGPT-6.1 TerraMistral Large 4
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
9.6 ptsCleared
Level 3Relay vault
19.2 ptsCleared
15.8 ptsClearedFinished early · 3 beacons left
Level 4Passing bay
17.8 ptsClearedFinished early · 3 beacons left
16.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20.6 ptsCleared
19.8 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

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.

Mistral Large 4

The central sphere, airborne black and deformed crimson support substantial state and placement credit. Recent cyan contact and crimson transport remain uncertain. Sparse wall patches and glossy gradients provide little evidence of the required extensive mirror system, while the missing centerline lamp and bulky crimson remain visible weaknesses.

Score breakdown

CategoryGPT-6.1 TerraMistral Large 4
State at 600 ms23.0/2517.0/25
Camera and placement11.0/1511.0/15
Reflections33.0/12012.0/120
Materials and scale7.5/105.5/10
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

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.

Mistral Large 4

An appealing, coherent illustration whose enormous rounded cat anchors the windblown composition. Warm shading and floating sketches communicate the brief well. Simplified paws, faint ear construction, inconsistent wind cues and limited material texture keep the execution below exceptional.

Score breakdown

CategoryGPT-6.1 TerraMistral Large 4
Task & likeness7.5/108.0/10
Anatomy & construction6.5/107.0/10
Space & placement6.5/107.5/10
Light & reflections6.0/107.0/10
Purposeful detail6.5/107.0/10
Artistry & character6.5/107.0/10
Materials & effects6.0/107.0/10
Visual integrity6.0/108.0/10

Benchmark task

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.

Mistral Large 4

A heavy ginger cat stays planted on a terrace as wind carries papers around it. The scene tests weight, expression and the contrast between stable and moving forms.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

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.

Mistral Large 4

A recognizable, cleanly rendered interpretation with a restrained palette and some facial modeling. Its enlarged frontal head, simplified expression, compressed low hands and schematic landscape substantially limit likeness and construction. The smooth rendering does not reproduce the painting's nuanced anatomy, clothing or atmospheric depth.

Score breakdown

CategoryGPT-6.1 TerraMistral Large 4
Task & likeness5.5/104.0/10
Anatomy & construction6.5/103.5/10
Space & placement4.5/105.0/10
Light & reflections6.5/104.5/10
Purposeful detail6.0/104.0/10
Artistry & character6.0/104.0/10
Materials & effects6.0/104.5/10
Visual integrity6.5/105.5/10

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

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.

Mistral Large 4

A clean, appealing beach illustration with clear subject coverage, a cohesive sunset palette and expressive animal details. Bodies and accessories resolve basic construction coherently, although joints remain schematic. Layered shapes establish modest depth; generic oval shadows and flat surfaces limit physical richness. Repeated forms and sparse articulation leave room for more accomplished drawing.

Score breakdown

CategoryGPT-6.1 TerraMistral Large 4
Task & likeness8.5/107.5/10
Anatomy & construction7.5/106.0/10
Space & placement6.5/107.0/10
Light & reflections5.5/106.5/10
Purposeful detail7.5/106.0/10
Artistry & character7.0/106.0/10
Materials & effects6.5/106.5/10
Visual integrity7.5/108.0/10

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

GPT-6.1 Terra

This benchmark has not been assessed yet.

Mistral Large 4

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

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.

Mistral Large 4

The central interaction is clear, with recognizable animals, expressive faces and a coherent sunset composition. Clean contours and readable accessories give the cartoon polish. Simplified joints, uncertain steering attachment, shallow hull volume and limited directional lighting constrain its physical resolution.

Score breakdown

CategoryGPT-6.1 TerraMistral Large 4
Task & likeness6.5/108.5/10
Anatomy & construction5.5/106.5/10
Space & placement6.0/107.0/10
Light & reflections5.0/105.5/10
Purposeful detail7.0/107.5/10
Artistry & character6.0/106.5/10
Materials & effects6.0/106.5/10
Visual integrity7.0/108.0/10

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

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.

Mistral Large 4

A coherent, appealing pelican illustration with a continuous body silhouette, readable bicycle and grounded wheels. Simplified legs and ambiguous steering and pedal connections limit construction. Clean shapes and expressive accessories succeed, while shallow depth, modest lighting and sparse material differentiation leave substantial room for refinement.

Score breakdown

CategoryGPT-6.1 TerraMistral Large 4
Task & likeness7.0/108.5/10
Anatomy & construction7.0/106.0/10
Space & placement6.0/107.0/10
Light & reflections5.5/106.5/10
Purposeful detail7.0/107.0/10
Artistry & character6.5/107.0/10
Materials & effects5.5/106.5/10
Visual integrity6.0/108.0/10

Benchmark task

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