STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Claude Sonnet 5.5 vs MiniMax M3.1 Flash

Claude Sonnet 5.5 leads MiniMax M3.1 Flash by 24.3 points on StealthMark, 70.2 to 45.9. It leads on 8 of 9 benchmarks, including both games, and MiniMax M3.1 Flash on 1. Claude Sonnet 5.5 scores higher on Ground Truth.

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All results ↗
All results ↗

Overall StealthMark

70.2/100Overall rank 3/53
45.9/100Overall rank 24/53

General Intelligence

67.0/100
35.8/100

Visual Intelligence

76.1/100
62.6/100

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

  • Claude Sonnet 5.5

BENCHMARK BY BENCHMARK

Where each model leads

  • Claude Sonnet 5.5
  • MiniMax M3.1 Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

Both take about 1M tokens of context.

  • Claude Sonnet 5.5
  • MiniMax M3.1 Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
Claude Sonnet 5.5: $10$2 inputMiniMax M3.1 Flash: No list price
Context windowTokens per request, max output below
Claude Sonnet 5.5: 1MTied128K max outputMiniMax M3.1 Flash: 1MTied
Output speedTokens per second, our measurement
Claude Sonnet 5.5: 249tokens/sMiniMax M3.1 Flash: Not measured
SizeTotal and active parameters
Claude Sonnet 5.5: Not disclosedMiniMax M3.1 Flash: 428B23B active
Developer
AnthropicMiniMax
Released
28 Sep 2026Not published
Origin
United StatesNot published
Input → output
Text, image → textText, image, video → text
Architecture
Not publishedMixture-of-Experts with MiniMax Sparse Attention and native multimodal encoder

Full datasheets, every price and sourceClaude Sonnet 5.5 ↗MiniMax M3.1 Flash ↗

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.

Claude Sonnet 5.5 59.6/100Rank 11/47

Survived 2 of 3
Foresight: complete playing field
Level 310 ptsTurn 20 / 20

MiniMax M3.1 Flash 30.7/100Rank 28/47

Survived 1 of 3
Foresight: complete playing field
Level 39 ptsTurn 20 / 20

Points per level

LevelClaude Sonnet 5.5MiniMax M3.1 Flash
Level 1Second Thoughts
25 ptsSurvived
6 ptsOut of lives
Level 2Pressure Pot
10 ptsOut of lives
5 ptsOut of lives
Level 3Hide or Flight
10 ptsSurvived
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.

Claude Sonnet 5.5 83.9/100Rank 4/48

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

MiniMax M3.1 Flash 21.9/100Rank 38/48

Cleared 2 of 5
Latch: complete playing field
Level 517.2 ptsTurn 24 / 40

Points per level

LevelClaude Sonnet 5.5MiniMax M3.1 Flash
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
10 ptsClearedFinished early · 1 beacon left
8.6 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
19.2 ptsCleared
5 ptsOut of turns
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
4.4 ptsFinished early
Level 5Second thoughts
20.6 ptsCleared
17.2 ptsFinished early

Newton's Mirror

Same task instructions

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

The judgment

Claude Sonnet 5.5

The near-field silhouettes, broad perspective and paint contact order are recognizable. Missing outer chains, truncated repetitions and absent ordered imagery within the main and reflected spheres substantially limit the reflection system. Sparse spherical highlights leave much of the curved room and emitter mapping unsupported, despite some plausible planar light sequences.

MiniMax M3.1 Flash

The sphere placement, separate airborne black blob, recent cyan contact and elongated crimson aftermath support the required gross physical state. The reflection system remains severely incomplete: isolated side images, broad metallic bands and sparse light patches replace extensive mirror repetitions and curved nested imagery.

Score breakdown

CategoryClaude Sonnet 5.5MiniMax M3.1 Flash
State at 600 ms24.0/2520.0/25
Camera and placement15.0/1510.0/15
Reflections35.0/12024.0/120
Materials and scale10.0/108.0/10
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

Claude Sonnet 5.5

The centered coral squid has a friendly, composed expression and a balanced flower-like silhouette. Eight thick arms and two slender tentacles remain visibly connected, with no inverted parts. The mantle is elongated rather than compact, and the arm spacing is uneven. Soft shading gives volume, but dense stippling weakens the requested smooth matte finish; the broad background halo makes depth less precise.

MiniMax M3.1 Flash

The sculptural M, confident grin and miniature theatrical pose closely fulfill the brief. Controlled gradients and clean shapes give the character volume and appeal. Moderate drawing complexity, an apparently separated shoe and ambiguous grounding limit the finish.

Score breakdown

CategoryClaude Sonnet 5.5MiniMax M3.1 Flash
Task & likeness8.0/107.5/10
Anatomy & construction8.0/106.0/10
Space & placement8.0/107.0/10
Light & reflections7.5/106.0/10
Purposeful detail8.0/105.0/10
Artistry & character8.0/106.0/10
Materials & effects8.0/107.0/10
Visual integrity8.5/106.0/10

Benchmark task

Claude Sonnet 5.5

A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.

MiniMax M3.1 Flash

A small robot with an oversized angular head presents a glowing object. The scene tests character proportions, gesture and contrasting materials.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Claude Sonnet 5.5

The crossed hands, dark dress, restrained smile and winding landscape clearly recall the Mona Lisa. Replication is limited by the frontal symmetry, wide eyes, elongated neck and flattened fingers. Soft facial shading provides volume, but heavy darkness and pervasive crackle obscure forms. The composition is coherent; the landscape and fabric remain visibly schematic.

MiniMax M3.1 Flash

A coherent decorative portrait combines layered hair, garment contours, linked trim and atmospheric scenery. These provide meaningful drawing complexity, but likeness remains limited by the frontal elongated face and altered clothing. Compressed hands, abrupt facial shading and cluttered local edges leave the portrait uneven.

Score breakdown

CategoryClaude Sonnet 5.5MiniMax M3.1 Flash
Task & likeness6.5/104.0/10
Anatomy & construction5.0/104.5/10
Space & placement6.0/105.5/10
Light & reflections6.5/104.5/10
Purposeful detail6.0/105.5/10
Artistry & character6.5/106.0/10
Materials & effects6.0/105.5/10
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

Claude Sonnet 5.5

A richly designed beach illustration combines radiant sunset bands, intricate palm fans and playful silhouettes within a cohesive purple, coral and turquoise palette. Carefully varied accessories reward close inspection, while overlapping foreground forms and shoreline layers organize the abundant activity. Dense palm strokes compete with focal subjects; animal anatomy, relative scales and reflected silhouettes remain simplified.

MiniMax M3.1 Flash

A controlled, detailed beach illustration with expressive animals, coherent depth and accomplished foliage and accessory drawing. Its warm palette and varied contours sustain visual interest. Simplified anatomy and object volumes limit physical conviction, while reflection streaks crossing dry-looking sand and generic shadows weaken the lighting.

Score breakdown

CategoryClaude Sonnet 5.5MiniMax M3.1 Flash
Task & likeness9.0/108.5/10
Anatomy & construction8.0/107.0/10
Space & placement8.5/107.5/10
Light & reflections8.5/106.0/10
Purposeful detail9.5/108.0/10
Artistry & character9.5/106.5/10
Materials & effects8.5/106.5/10
Visual integrity8.0/107.5/10

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

Claude Sonnet 5.5

This benchmark has not been assessed yet.

MiniMax M3.1 Flash

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

Claude Sonnet 5.5

The raccoon clearly rides on the dog's back while the dog grips the jet ski controls. Expressive faces, vivid colors and a sweeping wake make the scene appealing. Visible limbs connect coherently, but overlapping steering paws and an indistinct control mounting weaken construction. Flat character lighting and simplified water limit depth and material realism.

MiniMax M3.1 Flash

An expressive, coherent cartoon clearly demonstrates the requested riding and steering relationship. Layered animal shapes, readable vehicle depth and purposeful facial details support its drawing quality. Ambiguous grips, sparse cast shadows and simplified material responses limit physical precision.

Score breakdown

CategoryClaude Sonnet 5.5MiniMax M3.1 Flash
Task & likeness8.5/109.0/10
Anatomy & construction7.0/108.0/10
Space & placement8.0/108.0/10
Light & reflections6.5/106.0/10
Purposeful detail8.0/107.5/10
Artistry & character7.0/107.5/10
Materials & effects7.5/107.0/10
Visual integrity8.0/108.0/10

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

Claude Sonnet 5.5

The pelican is immediately recognizable, with an expressive face, generous bill and appealing cycling pose. Spokes, chain, feathers and scarf provide purposeful detail. The bicycle largely holds together, though overlapping angular legs obscure the far foot’s pedal contact. Clean outlines and balanced composition succeed; flat surfaces and limited directional lighting constrain depth.

MiniMax M3.1 Flash

A controlled coastal illustration with a clear pelican silhouette, detailed wheels and accomplished feather and bill drawing. Continuous body construction and grounded wheels support the scene. Ambiguous leg, pedal and steering contacts weaken the riding mechanics; approximate directional lighting and simplified materials limit physical conviction.

Score breakdown

CategoryClaude Sonnet 5.5MiniMax M3.1 Flash
Task & likeness9.0/108.5/10
Anatomy & construction7.5/106.5/10
Space & placement7.5/108.0/10
Light & reflections6.5/107.0/10
Purposeful detail8.0/107.5/10
Artistry & character7.5/106.5/10
Materials & effects6.5/107.0/10
Visual integrity8.0/106.5/10

Benchmark task

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