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 ↘Overall StealthMark
General Intelligence
Visual Intelligence
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
Games
SVG
DATASHEET
Specs and pricing
Both take about 1.05M tokens of context.
- GPT-5.5
- MiniMax M3.1 Flash
- Other models
- Median
- 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 ↗
Foresight
Play Foresight yourselfAnticipating 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

Points per level
Latch
Play Latch yourselfCooperative 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-5.5No run
MiniMax M3.1 Flash 21.9/100Rank 38/48

Points per level
Newton's Mirror
Same task instructionsPhysics, perspective and recursive reflections, tested together. Explore the test ↗
GPT-5.5 22.7/100 Rank 35/53

MiniMax M3.1 Flash 39.8/100 Rank 16/53

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
| Category | GPT-5.5 | MiniMax M3.1 Flash |
|---|---|---|
| State at 600 ms | 15.0/25 | 20.0/25 |
| Camera and placement | 6.0/15 | 10.0/15 |
| Reflections | 5.0/120 | 24.0/120 |
| Materials and scale | 6.0/10 | 8.0/10 |
| Floor-damage reward | 0.0/10 | 0.0/10 |
Benchmark task
A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.
Selfie
Different task instructionsVisual construction and creative interpretation.
GPT-5.5 41.9/100 Rank 48/53

MiniMax M3.1 Flash 61.7/100 Rank 27/53

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
| Category | GPT-5.5 | MiniMax M3.1 Flash |
|---|---|---|
| Task & likeness | 3.0/10 | 7.5/10 |
| Anatomy & construction | 3.0/10 | 6.0/10 |
| Space & placement | 5.0/10 | 7.0/10 |
| Light & reflections | 5.0/10 | 6.0/10 |
| Purposeful detail | 4.5/10 | 5.0/10 |
| Artistry & character | 4.0/10 | 6.0/10 |
| Materials & effects | 4.5/10 | 7.0/10 |
| Visual integrity | 7.0/10 | 6.0/10 |
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 instructionsPrecise visual recall and portrait reconstruction.
GPT-5.5 17.3/100 Rank 43/53

MiniMax M3.1 Flash 50.0/100 Rank 12/53

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
| Category | GPT-5.5 | MiniMax M3.1 Flash |
|---|---|---|
| Task & likeness | 1.5/10 | 4.0/10 |
| Anatomy & construction | 1.5/10 | 4.5/10 |
| Space & placement | 1.5/10 | 5.5/10 |
| Light & reflections | 2.0/10 | 4.5/10 |
| Purposeful detail | 2.5/10 | 5.5/10 |
| Artistry & character | 1.5/10 | 6.0/10 |
| Materials & effects | 2.0/10 | 5.5/10 |
| Visual integrity | 1.5/10 | 5.5/10 |
Benchmark task
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Beach
Different task instructionsCreativity, perspective and visual beauty.
GPT-5.5 34.9/100 Rank 49/53

MiniMax M3.1 Flash 71.8/100 Rank 13/53

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
| Category | GPT-5.5 | MiniMax M3.1 Flash |
|---|---|---|
| Task & likeness | 7.0/10 | 8.5/10 |
| Anatomy & construction | 2.5/10 | 7.0/10 |
| Space & placement | 3.0/10 | 7.5/10 |
| Light & reflections | 3.0/10 | 6.0/10 |
| Purposeful detail | 3.0/10 | 8.0/10 |
| Artistry & character | 3.0/10 | 6.5/10 |
| Materials & effects | 3.0/10 | 6.5/10 |
| Visual integrity | 3.5/10 | 7.5/10 |
Benchmark task
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Ground Truth
Same task instructionsPhysical reasoning, light and visual reconstruction.
GPT-5.5 40.8/100 Rank 27/53

MiniMax M3.1 Flash 41.9/100 Rank 25/53

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 instructionsScene composition and interacting subjects.
GPT-5.5 35.8/100 Rank 45/53

MiniMax M3.1 Flash 76.8/100 Rank 4/53

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
| Category | GPT-5.5 | MiniMax M3.1 Flash |
|---|---|---|
| Task & likeness | 3.5/10 | 9.0/10 |
| Anatomy & construction | 3.0/10 | 8.0/10 |
| Space & placement | 4.5/10 | 8.0/10 |
| Light & reflections | 5.0/10 | 6.0/10 |
| Purposeful detail | 3.5/10 | 7.5/10 |
| Artistry & character | 3.0/10 | 7.5/10 |
| Materials & effects | 5.0/10 | 7.0/10 |
| Visual integrity | 3.0/10 | 8.0/10 |
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 instructionsSubject construction and spatial relationships.
GPT-5.5 60.0/100 Rank 36/53

MiniMax M3.1 Flash 72.0/100 Rank 17/53

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
| Category | GPT-5.5 | MiniMax M3.1 Flash |
|---|---|---|
| Task & likeness | 7.5/10 | 8.5/10 |
| Anatomy & construction | 4.5/10 | 6.5/10 |
| Space & placement | 6.5/10 | 8.0/10 |
| Light & reflections | 6.5/10 | 7.0/10 |
| Purposeful detail | 5.5/10 | 7.5/10 |
| Artistry & character | 5.0/10 | 6.5/10 |
| Materials & effects | 6.0/10 | 7.0/10 |
| Visual integrity | 7.5/10 | 6.5/10 |
Benchmark task
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.