STEALTHMARK · HEAD TO HEAD
All comparisons ↗Kolibri-1 vs Muse Spark Open
Muse Spark Open leads Kolibri-1 by 30.5 points on StealthMark, 44.1 to 13.6. It leads on all 7 benchmarks with results for both. Muse Spark Open scores higher on Ground Truth.
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
- Kolibri-1Multi-step reasoning not measured
- Muse Spark Open
BENCHMARK BY BENCHMARK
Where each model leads
- Kolibri-1
- Muse Spark Open
- Other models
- Median
Games
SVG
DATASHEET
Specs and pricing
Muse Spark Open scores higher on StealthMark and runs 2.2× faster in our speed test. Both take about 1M tokens of context.
- Kolibri-1
- Muse Spark Open
- Other models
- Median
- Developer
- Aleph AlphaMeta
- Released
- 3 Oct 202615 Oct 2026
- Origin
- GermanyUnited States
- Input → output
- Text → textText, image, audio, video → text
- Architecture
- Mixture-of-Experts with 4:1 sliding-window-attention to global-attention patternSparse mixture-of-experts Transformer with perception encoders; 62 decoder layers, 256 experts with 8 selected per token, grouped-query attention and sliding-window/full-attention layers.
Full datasheets, every price and sourceKolibri-1 ↗Muse Spark Open ↗
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.
Muse Spark Open 29.4/100Rank 34/47

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.
Kolibri-1No run
Muse Spark Open 75.7/100Rank 12/48

Points per level
Newton's Mirror
Same task instructionsPhysics, perspective and recursive reflections, tested together. Explore the test ↗
Kolibri-1 10.4/100 Rank 47/53

Muse Spark Open 19.6/100 Rank 39/53

The judgment
Kolibri-1
A segmented gray perimeter surrounds a black field containing one large, low-positioned gray sphere and two small colored circles. Rounded volume and restrained paint scale earn partial material credit. The image does not demonstrate the required optical structure, while paint history, airborne black and settled support remain largely unresolved.
Muse Spark Open
The airborne black blob and deformed paint support the broad contact sequence, although cyan attachment and wheel-directed transport remain partial. The sphere and black blob have substantial framing errors. The dominant limitation is the largely absent mirror system: faint wall circles and isolated highlights provide little evidence of recursive room geometry or curved nested reflections. Oversized compact paint features and diffuse material treatment further limit credit.
Score breakdown
| Category | Kolibri-1 | Muse Spark Open |
|---|---|---|
| State at 600 ms | 9.5/25 | 14.0/25 |
| Camera and placement | 1.5/15 | 6.0/15 |
| Reflections | 0.0/120 | 8.0/120 |
| Materials and scale | 3.0/10 | 3.5/10 |
| 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.
Kolibri-1 22.9/100 Rank 53/53

Muse Spark Open 52.1/100 Rank 40/53

The judgment
Kolibri-1
A restrained ivory, teal and green palette gives the image simple graphic coherence. Execution remains rudimentary: detached oval wings, ambiguous central anatomy and unclear feeding contact prevent a convincing hummingbird scene. The requested feather structure, botanical detail, lighting and enclosing arch are largely unresolved.
Muse Spark Open
The rounded silhouette and asymmetric expression make an appealing baby elephant, supported by a quiet background and grounding shadow. The protective action remains difficult to read: forefeet cannot be confidently traced into a grip, and seed contact is crowded by fine lines. Controlled simple shapes provide charm, but limited anatomical clarity, shading and surface detail leave the execution uneven.
Score breakdown
| Category | Kolibri-1 | Muse Spark Open |
|---|---|---|
| Task & likeness | 2.5/10 | 5.0/10 |
| Anatomy & construction | 2.0/10 | 4.5/10 |
| Space & placement | 3.0/10 | 6.0/10 |
| Light & reflections | 2.0/10 | 5.0/10 |
| Purposeful detail | 1.5/10 | 6.0/10 |
| Artistry & character | 1.5/10 | 5.0/10 |
| Materials & effects | 2.0/10 | 5.0/10 |
| Visual integrity | 5.5/10 | 6.5/10 |
Benchmark task
Kolibri-1
A jewel-coloured hummingbird hovering in flight tests avian anatomy, delicate structure and iridescent surface detail.
Muse Spark Open
A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.
Mona Lisa
Different task instructionsPrecise visual recall and portrait reconstruction.
Kolibri-1 3.3/100 Rank 50/53

Muse Spark Open 37.8/100 Rank 27/53

The judgment
Kolibri-1
The candidate offers a clean, highly simplified frontal portrait with warm skin and dark hair. Its oversized oval face, schematic features and unresolved body provide little Mona Lisa likeness. Missing crossed hands, clothing detail and landscape remove essential parts of the original composition; smooth gradients supply only limited volume.
Muse Spark Open
A recognizable, orderly interpretation with clean major contours, connected body forms and modest facial shading. Wide eyes, frontal symmetry and schematic hands limit likeness and expression. Layered scenery establishes basic depth, but shallow arm overlaps, flat clothing and sparse fine detail keep the execution basic and uneven.
Score breakdown
| Category | Kolibri-1 | Muse Spark Open |
|---|---|---|
| Task & likeness | 0.5/10 | 3.0/10 |
| Anatomy & construction | 0.5/10 | 3.0/10 |
| Space & placement | 0.0/10 | 5.0/10 |
| Light & reflections | 0.0/10 | 4.5/10 |
| Purposeful detail | 0.0/10 | 4.0/10 |
| Artistry & character | 0.5/10 | 3.0/10 |
| Materials & effects | 0.5/10 | 4.0/10 |
| Visual integrity | 0.5/10 | 6.0/10 |
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.
Kolibri-1 12.9/100 Rank 52/53

Muse Spark Open 64.2/100 Rank 25/53

The judgment
Kolibri-1
A recognizable sunset beach has an appealing purple-orange gradient and clean geometric edges. Birds and animals remain unresolved, terrain obscures the relationship between shore and water, and reflections are absent. Sparse detail, flat materials and limited activity keep the drawing elementary despite its tidy rendering.
Muse Spark Open
A coherent sunset beach with readable activities, balanced framing and controlled colour transitions. Small accessories add interest, but schematic anatomy, limited surface detail, weak directional shadows and a geometric reflection constrain its finish. Most shapes and overlaps remain clean.
Score breakdown
| Category | Kolibri-1 | Muse Spark Open |
|---|---|---|
| Task & likeness | 2.5/10 | 8.0/10 |
| Anatomy & construction | 0.5/10 | 6.0/10 |
| Space & placement | 3.0/10 | 6.5/10 |
| Light & reflections | 1.0/10 | 5.5/10 |
| Purposeful detail | 0.5/10 | 6.5/10 |
| Artistry & character | 1.0/10 | 5.5/10 |
| Materials & effects | 0.5/10 | 6.0/10 |
| Visual integrity | 3.0/10 | 8.0/10 |
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.
Kolibri-1 21.2/100 Rank 44/53

Muse Spark Open 51.9/100 Rank 12/53

The judgment
Kolibri-1
This benchmark has not been assessed yet.
Muse Spark Open
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.
Kolibri-1 10.0/100 Rank 53/53

Muse Spark Open 43.9/100 Rank 40/53

The judgment
Kolibri-1
Clean shapes and a readable coral platform provide basic graphic clarity, but the animal construction remains fragmented. A recognizable raccoon riding the dog's back, connected steering and convincing water contact are not demonstrated. Sparse detail, flat subjects and absent movement effects support retaining the baseline category assessments.
Muse Spark Open
Expressive faces, distinct accessories and clean color separation make the scene appealing and recognizable. Character detail is stronger than the functional construction: steering contact, limb overlaps and seating remain ambiguous. The readable hull and lively spray establish motion, while limited directional shading and simplified surfaces constrain depth and physical coherence.
Score breakdown
| Category | Kolibri-1 | Muse Spark Open |
|---|---|---|
| Task & likeness | 1.5/10 | 4.0/10 |
| Anatomy & construction | 1.0/10 | 3.0/10 |
| Space & placement | 1.0/10 | 6.0/10 |
| Light & reflections | 0.0/10 | 4.5/10 |
| Purposeful detail | 0.5/10 | 7.0/10 |
| Artistry & character | 0.5/10 | 3.5/10 |
| Materials & effects | 0.5/10 | 5.0/10 |
| Visual integrity | 3.5/10 | 5.0/10 |
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.
Kolibri-1 17.5/100 Rank 53/53

Muse Spark Open 60.5/100 Rank 34/53

The judgment
Kolibri-1
Clean shapes and aligned wheels establish a readable schematic scene. Pelican likeness, riding support and bicycle mechanics remain substantially unresolved. Sparse detail and flat surfaces limit expression and volume. Strong edge and fill integrity is a separate success and does not repair the construction.
Muse Spark Open
A controlled, appealing cartoon with a recognizable pelican, expressive face and clean curved forms. Feather lines, spokes and bill shading provide useful complexity. Aligned wheels and a ground shadow establish placement, but uncertain pedal contacts and obscured mechanical connections weaken support and riding action. Lighting remains loosely coordinated with the sun.
Score breakdown
| Category | Kolibri-1 | Muse Spark Open |
|---|---|---|
| Task & likeness | 1.5/10 | 7.5/10 |
| Anatomy & construction | 1.5/10 | 5.0/10 |
| Space & placement | 1.5/10 | 6.0/10 |
| Light & reflections | 3.0/10 | 5.0/10 |
| Purposeful detail | 1.5/10 | 6.5/10 |
| Artistry & character | 1.0/10 | 5.5/10 |
| Materials & effects | 1.0/10 | 6.0/10 |
| Visual integrity | 3.5/10 | 7.5/10 |
Benchmark task
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.