STEALTHMARK · HEAD TO HEAD
All comparisons ↗LongCat-2.0 vs Step 5 Preview
Step 5 Preview leads LongCat-2.0 by 13.5 points on StealthMark, 39.0 to 25.5. LongCat-2.0 leads on 4 of the 7 benchmarks with results for both and Step 5 Preview on 3. Step 5 Preview scores higher on Newton's Mirror, with its largest category advantage in state at 600 ms.
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
- LongCat-2.0Multi-step reasoning not measured
BENCHMARK BY BENCHMARK
Where each model leads
- LongCat-2.0
- Step 5 Preview
- Other models
- Median
Games
SVG
DATASHEET
Specs and pricing
Both take about 1M tokens of context.
- LongCat-2.0
- Step 5 Preview
- Other models
- Median
- Developer
- MeituanStepFun
- Origin
- ChinaNot published
- Input → output
- Text → textText, image, video → text
- Architecture
- Mixture-of-Experts with LongCat Sparse AttentionSparse mixture-of-experts; 92 layers (88 MoE), 352 routed experts with 8 selected per token plus a shared expert; grouped-query attention with 512-token sliding windows and full attention every fourth layer; 3 multi-token-prediction layers; vision tower for image and video input
Full datasheets, every price and sourceLongCat-2.0 ↗Step 5 Preview ↗
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.
Step 5 Preview 59.9/100Rank 42/491 of 3 levels

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.
LongCat-2.0No run
Step 5 Preview 40.7/100Rank 28/50

Points per level
Newton's Mirror
Same task instructionsPhysics, perspective and recursive reflections, tested together. Explore the test ↗
LongCat-2.0 23.1/100 Rank 34/53

Step 5 Preview 37.9/100 Rank 19/53

The judgment
LongCat-2.0
Cyan lies on the sphere's facing middle rather than showing its recent interaction near the apex. Separate airborne black and elongated crimson support part of the timing sequence. Small side images and an overlapping lower image provide limited reflection ordering, but recursive room structure, nested imagery and emitter mappings are largely absent. The main sphere is smaller and higher in the frame than prescribed, and the surfaces have a soft, matte appearance.
Step 5 Preview
The main sphere, airborne black and small colored features occupy broadly appropriate positions. Most of the defining mirror system is absent, and paint interaction remains only partially supported. The small paint features do not visibly establish a separate volume-scale violation.
Score breakdown
| Category | LongCat-2.0 | Step 5 Preview |
|---|---|---|
| State at 600 ms | 9.5/25 | 20.0/25 |
| Camera and placement | 6.5/15 | 13.5/15 |
| Reflections | 12.5/120 | 20.0/120 |
| Materials and scale | 5.5/10 | 7.0/10 |
| 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.
LongCat-2.0 61.6/100 Rank 28/53

Step 5 Preview 52.0/100 Rank 40/53

The judgment
LongCat-2.0
Amber slit eyes, a pointed beak, cream feathers and gold-trimmed black clothing establish the secretive owl rogue. The head appears frontal rather than lowered, with much of the face exposed. The centered silhouette is effective, but stiff cloak geometry, shallow facial modeling and extremely dark clothing limit depth and finish. Sparse gold markings suggest the requested circuitry only loosely.
Step 5 Preview
A charming diagonal climber and warm palette communicate the central idea. Simple rounded construction, crowded limb counting, uncertain footholds and an unattached upper shelf limit its physical coherence. Growth bands and the yarn trail add specificity, but the requested material distinctions and unravelled bootie remain underdeveloped.
Score breakdown
| Category | LongCat-2.0 | Step 5 Preview |
|---|---|---|
| Task & likeness | 7.0/10 | 6.0/10 |
| Anatomy & construction | 6.0/10 | 4.5/10 |
| Space & placement | 6.0/10 | 5.0/10 |
| Light & reflections | 5.5/10 | 5.5/10 |
| Purposeful detail | 6.0/10 | 5.5/10 |
| Artistry & character | 6.5/10 | 5.0/10 |
| Materials & effects | 5.5/10 | 6.0/10 |
| Visual integrity | 6.5/10 | 5.0/10 |
Benchmark task
LongCat-2.0
A cloaked owl with luminous eyes tests expression, fabric folds and the separation of dark forms.
Step 5 Preview
Character scenes test expression, anatomy, materials and coherent visual construction.
Mona Lisa
Different task instructionsPrecise visual recall and portrait reconstruction.
LongCat-2.0 4.1/100 Rank 49/53

Step 5 Preview 38.4/100 Rank 27/53

The judgment
LongCat-2.0
The centered portrait, slight smile, overlapping hands and distant landscape suggest Mona Lisa, but replication is weak. The face has little volume, the shoulders and torso form a narrow wedge, and the hands are fingerless ovals with unresolved wrists. Broad gray background bands provide limited depth. A bright head rim and pale hands contrast with an almost featureless dark figure.
Step 5 Preview
A recognizable, coherent simplification with purposeful facial contours and differentiated fingers. These provide more construction and detail than the broad silhouette alone suggests. The oversized face, frontal seated pose, unresolved wrists and sparse landscape still substantially limit likeness, depth and finish.
Score breakdown
| Category | LongCat-2.0 | Step 5 Preview |
|---|---|---|
| Task & likeness | 0.5/10 | 4.0/10 |
| Anatomy & construction | 0.5/10 | 4.0/10 |
| Space & placement | 0.5/10 | 4.0/10 |
| Light & reflections | 0.5/10 | 3.5/10 |
| Purposeful detail | 0.0/10 | 4.0/10 |
| Artistry & character | 0.5/10 | 4.0/10 |
| Materials & effects | 0.0/10 | 3.0/10 |
| Visual integrity | 0.5/10 | 3.5/10 |
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.
LongCat-2.0 54.4/100 Rank 35/53

Step 5 Preview 33.5/100 Rank 48/53

The judgment
LongCat-2.0
The sunset, palms, birds and beach animals create a cheerful, readable scene. Clean silhouettes and a vivid sky establish the composition, but construction remains schematic. The right palm appears rooted in open water, shadows have limited connection to the sunset, and the sun’s reflection consists of rigid bands. Small creatures and beach equipment are recognizable but minimally developed.
Step 5 Preview
A recognizable sunset beach with clear warm-cool contrast and playful accessories. Basic animal construction, shallow foreground placement and schematic reflections limit spatial and physical credibility. Sparse descriptive detail and abruptly ended sky bands constrain the finish.
Score breakdown
| Category | LongCat-2.0 | Step 5 Preview |
|---|---|---|
| Task & likeness | 7.5/10 | 4.0/10 |
| Anatomy & construction | 5.5/10 | 3.0/10 |
| Space & placement | 5.5/10 | 3.5/10 |
| Light & reflections | 6.0/10 | 3.5/10 |
| Purposeful detail | 5.0/10 | 3.0/10 |
| Artistry & character | 5.0/10 | 3.0/10 |
| Materials & effects | 3.0/10 | 3.5/10 |
| Visual integrity | 4.0/10 | 4.0/10 |
Benchmark task
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Ground Truth
Same task instructionsPhysical reasoning, light and visual reconstruction.
LongCat-2.0 12.9/100 Rank 50/53

Step 5 Preview 33.3/100 Rank 35/53

The judgment
LongCat-2.0
This benchmark has not been assessed yet.
Step 5 Preview
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.
LongCat-2.0 42.6/100 Rank 41/53

Step 5 Preview 37.8/100 Rank 44/53

The judgment
LongCat-2.0
The raccoon is recognizable and expressive, with a clear mask and striped tail. The dog's anatomy is poorly resolved, and the flattened craft lacks convincing steering and seating. Feet extend below the hull, weakening the sense of support. An appealing palette, clean shapes and decorative water effects give the illustration some polish.
Step 5 Preview
Recognizable animals, a bright palette and identifying accessories support a basic cartoon. Primitive anatomy, partial seated support, unresolved steering and weak hull-water contact limit the central action. Lighting and spray provide atmosphere without establishing convincing physical depth.
Score breakdown
| Category | LongCat-2.0 | Step 5 Preview |
|---|---|---|
| Task & likeness | 4.0/10 | 4.0/10 |
| Anatomy & construction | 3.0/10 | 4.5/10 |
| Space & placement | 4.5/10 | 3.0/10 |
| Light & reflections | 5.5/10 | 3.5/10 |
| Purposeful detail | 6.0/10 | 4.0/10 |
| Artistry & character | 3.0/10 | 3.5/10 |
| Materials & effects | 5.5/10 | 3.0/10 |
| Visual integrity | 5.0/10 | 3.0/10 |
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.
LongCat-2.0 79.0/100 Rank 3/53

Step 5 Preview 30.0/100 Rank 51/53

The judgment
LongCat-2.0
A clearly recognizable pelican cycles through a well-composed coastal sunset. Warm colors, flowing scarf, feather contours and bicycle details give the illustration character. The legs connect to the body, but the farther foot's pedal contact and the wing's handlebar grip remain ambiguous. Clean vector shapes provide polish, with limited material texture and directional shading.
Step 5 Preview
The pelican and bicycle are recognizable, with a pleasant palette and basic diffuse shading. The riding relationship fails physically: the bird is unsupported, the front wheel is unmounted, and pedalling is unresolved. Simple geometric construction and sparse material treatment further limit the drawing.
Score breakdown
| Category | LongCat-2.0 | Step 5 Preview |
|---|---|---|
| Task & likeness | 8.5/10 | 3.0/10 |
| Anatomy & construction | 7.0/10 | 3.0/10 |
| Space & placement | 8.0/10 | 3.0/10 |
| Light & reflections | 7.5/10 | 3.0/10 |
| Purposeful detail | 8.0/10 | 4.0/10 |
| Artistry & character | 8.5/10 | 3.0/10 |
| Materials & effects | 7.0/10 | 3.0/10 |
| Visual integrity | 8.5/10 | 2.0/10 |
Benchmark task
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.