STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Claude Fable 5.1 vs MiniMax M3.1 Flash

Claude Fable 5.1 leads MiniMax M3.1 Flash by 16.1 points on StealthMark, 62.0 to 45.9. It leads on 7 of 9 benchmarks, including Latch, and MiniMax M3.1 Flash on 2, including Foresight. Claude Fable 5.1 scores higher on Newton's Mirror, with its largest category advantage in reflections.

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All results ↗
All results ↗

Overall StealthMark

62.0/100Overall rank 8/53
45.9/100Overall rank 24/53

General Intelligence

58.9/100
35.8/100

Visual Intelligence

67.1/100
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

BENCHMARK BY BENCHMARK

Where each model leads

  • Claude Fable 5.1
  • MiniMax M3.1 Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

Both take about 1M tokens of context.

  • Claude Fable 5.1
  • MiniMax M3.1 Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
Claude Fable 5.1: $50$10 inputMiniMax M3.1 Flash: No list price
Context windowTokens per request, max output below
Claude Fable 5.1: 1MTied128K max outputMiniMax M3.1 Flash: 1MTied
Output speedTokens per second, our measurement
Claude Fable 5.1: 122tokens/sMiniMax M3.1 Flash: Not measured
SizeTotal and active parameters
Claude Fable 5.1: Not disclosedMiniMax M3.1 Flash: 428B23B active
Developer
AnthropicMiniMax
Released
1 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 Fable 5.1 ↗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 Fable 5.1 34.2/100Rank 37/472 of 3 levels

2 of 3 played
Foresight: complete playing field
Level 38 ptsTurn 17 / 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 Fable 5.1MiniMax M3.1 Flash
Level 1Second Thoughts
21 ptsOut of lives
6 ptsOut of lives
Level 2Pressure Pot
Pending
5 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.

Claude Fable 5.1 80.2/100Rank 24/483 of 5 levels

3 of 5 played
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 Fable 5.1MiniMax M3.1 Flash
Level 1Hold the door
Pending
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
8.6 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
Pending
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 Fable 5.1

The broad paint sequence, bilateral near-field sphere arrangement, overlaps and diminishing panel repetitions are recognizable; crimson is slightly too low. Small paint scale and basic shading provide material cues, although the steel response remains soft. Inaccurate light projections, missing outer chains and incomplete nested room imagery remain the principal limitations.

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 Fable 5.1MiniMax M3.1 Flash
State at 600 ms24.0/2520.0/25
Camera and placement14.0/1510.0/15
Reflections48.0/12024.0/120
Materials and scale7.5/108.0/10
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 Fable 5.1

The coral palette, friendly face, matte shading and cream arch create a coherent emblem. However, the mantle is elongated rather than compact, and the appendages spread mostly sideways and downward instead of forming an evenly spaced, flower-like starburst. Two thin hanging appendages weaken the thick-arm motif. Clean contours and balanced framing support the simple design.

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 Fable 5.1MiniMax M3.1 Flash
Task & likeness6.5/107.5/10
Anatomy & construction7.0/106.0/10
Space & placement7.5/107.0/10
Light & reflections6.5/106.0/10
Purposeful detail6.0/105.0/10
Artistry & character7.0/106.0/10
Materials & effects6.5/107.0/10
Visual integrity8.0/106.0/10

Benchmark task

Claude Fable 5.1

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 Fable 5.1

The dark clothing, crossed hands and hazy landscape establish the Mona Lisa composition. Replication is limited by the frontal, elongated face, wide eyes and simplified smile. Rounded, parallel fingers and unclear wrist transitions weaken the hands. Warm facial shading gives some volume, but broad garment shapes and scattered crack marks substitute for convincing folds and painterly detail.

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 Fable 5.1MiniMax M3.1 Flash
Task & likeness5.5/104.0/10
Anatomy & construction6.0/104.5/10
Space & placement6.0/105.5/10
Light & reflections6.0/104.5/10
Purposeful detail5.0/105.5/10
Artistry & character5.5/106.0/10
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 Fable 5.1

The colorful sunset, layered shoreline, animals, kite and beach toys fulfill the lively beach brief. Clean silhouettes and a balanced composition give the illustration character. Construction is simplified: the umbrella resembles a segmented fan, dolphins have weak water interaction, and the sun’s reflection forms a rigid widening wedge. Flat surfaces and sparse contact shadows limit depth.

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 Fable 5.1MiniMax M3.1 Flash
Task & likeness8.5/108.5/10
Anatomy & construction7.0/107.0/10
Space & placement7.0/107.5/10
Light & reflections7.0/106.0/10
Purposeful detail7.5/108.0/10
Artistry & character7.5/106.5/10
Materials & effects6.5/106.5/10
Visual integrity7.5/107.5/10

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 Fable 5.1

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 Fable 5.1

The raccoon rides on the dog's back, and the dog's extended foreleg reaches the jet ski controls. Expressive faces, a clear silhouette and sweeping spray make the action readable. Limb and handlebar overlaps weaken construction; broad shading provides limited volume, and the glowing sun has little corresponding reflection on the water. Clean vector shapes support an appealing but simplified illustration.

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 Fable 5.1MiniMax M3.1 Flash
Task & likeness8.5/109.0/10
Anatomy & construction6.5/108.0/10
Space & placement7.0/108.0/10
Light & reflections5.5/106.0/10
Purposeful detail7.0/107.5/10
Artistry & character7.0/107.5/10
Materials & effects6.5/107.0/10
Visual integrity7.5/108.0/10

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 Fable 5.1

The pelican reads clearly, with an expressive face, prominent bill and appealing composition. Both legs connect to the body, but the far foot's pedal contact and the wing's steering grip remain unclear. Wheel alignment and background layers are coherent. Clean contours and feather lines give polish, while schematic machinery, limited surface texture and weak directional lighting constrain the finish.

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 Fable 5.1MiniMax M3.1 Flash
Task & likeness8.5/108.5/10
Anatomy & construction7.0/106.5/10
Space & placement7.5/108.0/10
Light & reflections6.0/107.0/10
Purposeful detail7.0/107.5/10
Artistry & character7.0/106.5/10
Materials & effects6.0/107.0/10
Visual integrity8.0/106.5/10

Benchmark task

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