STEALTHMARK · HEAD TO HEAD

All comparisons ↗

GPT-5.5 vs MiniMax M3.1 Flash

MiniMax M3.1 Flash leads GPT-5.5 by 14.6 points on StealthMark, 45.9 to 31.3. It leads on all 7 benchmarks with results for both. MiniMax M3.1 Flash scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

31.3/100Overall rank 43/53
45.9/100Overall rank 24/53

General Intelligence

26.8/100
35.8/100

Visual Intelligence

36.3/100
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

  • GPT-5.5Multi-step reasoning not measured

BENCHMARK BY BENCHMARK

Where each model leads

  • GPT-5.5
  • MiniMax M3.1 Flash
  • Other models
  • Median

DATASHEET

Specs and pricing

Both take about 1.05M tokens of context.

  • GPT-5.5
  • MiniMax M3.1 Flash
  • Other models
  • Median
PricePer 1M output tokens, input below
GPT-5.5: $30$5 inputMiniMax M3.1 Flash: No list price
Context windowTokens per request, max output below
GPT-5.5: 1.05MTied128K max outputMiniMax M3.1 Flash: 1MTied
Output speedTokens per second, our measurement
GPT-5.5: 193tokens/sMiniMax M3.1 Flash: Not measured
SizeTotal and active parameters
GPT-5.5: Not disclosedMiniMax M3.1 Flash: 428B23B active
Developer
OpenAIMiniMax
Released
23 Apr 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 sourceGPT-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.

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

LevelGPT-5.5MiniMax M3.1 Flash
Level 1Second Thoughts
No run
6 ptsOut of lives
Level 2Pressure Pot
No run
5 ptsOut of lives
Level 3Hide or Flight
No run
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.

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

LevelGPT-5.5MiniMax M3.1 Flash
Level 1Hold the door
No run
5.2 ptsCleared
Level 2Crossfeed
No run
8.6 ptsClearedFinished early · 1 beacon left
Level 3Relay vault
No run
5 ptsOut of turns
Level 4Passing bay
No run
4.4 ptsFinished early
Level 5Second thoughts
No run
17.2 ptsFinished early

Newton's Mirror

Same task instructions

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

The judgment

GPT-5.5

The paint ordering and separate black bead support part of the physical state, but adhesion and rotational transport remain only partly established. The sweeping cyan arc and long crimson lobes do not clearly communicate the limited time since their respective impacts. The main sphere is too large and too low, and the black bead is below its required projected position. Displaced isolated sphere images, a flattened floor echo and missing recursive, nested and emitter reflections provide little coherent optical structure. The colored paint is excessively bulky for the specified quantities.

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

CategoryGPT-5.5MiniMax M3.1 Flash
State at 600 ms15.0/2520.0/25
Camera and placement6.0/1510.0/15
Reflections5.0/12024.0/120
Materials and scale6.0/108.0/10
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

GPT-5.5

Six pale, scaled lobes form a balanced radial arrangement, but they remain separate capsules rather than an interlocking serpent knot. There are no crossings, alternating overlaps, or crisp inner bends; the central hexagon is an isolated outline. Small outward-facing heads sit within the lobes without integrated necks. Soft shading and tidy contours provide some finish, while repetitive oval scales and cartoon faces limit organic credibility.

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

CategoryGPT-5.5MiniMax M3.1 Flash
Task & likeness3.0/107.5/10
Anatomy & construction3.0/106.0/10
Space & placement5.0/107.0/10
Light & reflections5.0/106.0/10
Purposeful detail4.5/105.0/10
Artistry & character4.0/106.0/10
Materials & effects4.5/107.0/10
Visual integrity7.0/106.0/10

Benchmark task

GPT-5.5

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.

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

GPT-5.5

The veil, restrained smile, crossed hands and muted landscape establish Mona Lisa references. The oversized frontal face and schematic features weaken likeness and expression, while fingerless tapered hand shapes leave anatomy unresolved. Clean contours and balanced framing provide coherence, but sparse garment detail, broad landscape bands and shallow shading limit the portrait's sophistication.

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

CategoryGPT-5.5MiniMax M3.1 Flash
Task & likeness1.5/104.0/10
Anatomy & construction1.5/104.5/10
Space & placement1.5/105.5/10
Light & reflections2.0/104.5/10
Purposeful detail2.5/105.5/10
Artistry & character1.5/106.0/10
Materials & effects2.0/105.5/10
Visual integrity1.5/105.5/10

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-5.5

The sunset, palms, birds, playful animals and ball clearly establish the requested beach scene. Warm sky gradients and clean silhouettes make it appealing. Animal construction is underdeveloped: torso and limb connections are unclear, especially in the round-eared foreground figure. The dolphin lacks a convincing splash, and broad reflection bands suggest sunset light without resolving its behavior on water.

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

CategoryGPT-5.5MiniMax M3.1 Flash
Task & likeness7.0/108.5/10
Anatomy & construction2.5/107.0/10
Space & placement3.0/107.5/10
Light & reflections3.0/106.0/10
Purposeful detail3.0/108.0/10
Artistry & character3.0/106.5/10
Materials & effects3.0/106.5/10
Visual integrity3.5/107.5/10

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

GPT-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

GPT-5.5

The raccoon's masked face, bright hull and sweeping wake make the scene readable and lively. The dog is much less resolved: its head is ambiguous, overlapping brown forms obscure its anatomy, and its paws do not visibly grip the controls. Smooth shapes and cheerful colors provide appeal, but weak steering construction and limited depth keep the drawing uneven.

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

CategoryGPT-5.5MiniMax M3.1 Flash
Task & likeness3.5/109.0/10
Anatomy & construction3.0/108.0/10
Space & placement4.5/108.0/10
Light & reflections5.0/106.0/10
Purposeful detail3.5/107.5/10
Artistry & character3.0/107.5/10
Materials & effects5.0/107.0/10
Visual integrity3.0/108.0/10

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-5.5

The oversized bill, bright bicycle and sunset create an appealing, recognizable cartoon. Riding mechanics are less convincing: the wing has no clear steering contact, leg attachments are uneven, and feet do not visibly engage pedals. A dark notch complicates the rear neck junction. Clean contours and orderly spokes provide polish, while simplified anatomy and lighting limit 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

CategoryGPT-5.5MiniMax M3.1 Flash
Task & likeness7.5/108.5/10
Anatomy & construction4.5/106.5/10
Space & placement6.5/108.0/10
Light & reflections6.5/107.0/10
Purposeful detail5.5/107.5/10
Artistry & character5.0/106.5/10
Materials & effects6.0/107.0/10
Visual integrity7.5/106.5/10

Benchmark task

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