STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Muse Wonder vs Callstack Apex

Muse Wonder leads Callstack Apex by 7.5 points on StealthMark, 57.0 to 49.5. It leads on 5 of the 8 benchmarks with results for both, including Latch, and Callstack Apex on 3. Muse Wonder scores higher on Newton's Mirror, with its largest category advantage in reflections.

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All results ↗
Model guide ↗

Overall StealthMark

57.0/100Overall rank 10/53
49.5/100Overall rank 18/53

General Intelligence

53.1/100
40.4/100

Visual Intelligence

64.0/100
59.6/100

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

  • Muse Wonder
  • Callstack Apex
  • Other models
  • Median

DATASHEET

Specs and pricing

Muse Wonder scores higher on StealthMark, takes 4× more context and runs 2.2× faster in our speed test. Callstack Apex is 6.7× cheaper per output token.

  • Muse Wonder
  • Callstack Apex
  • Other models
  • Median
PricePer 1M output tokens, input below
Muse Wonder: $20$4 inputCallstack Apex: $36.7× cheaper$0.50 input
Context windowTokens per request, max output below
Muse Wonder: 1M4× largerCallstack Apex: 256K
Output speedTokens per second, our measurement
Muse Wonder: 5702.2× fastertokens/sCallstack Apex: 255tokens/s
Developer
MetaCallstack
Released
12 Oct 20261 Oct 2026
Origin
United StatesPoland
Input → output
Text, image, video, audio, PDF → textText → text
Architecture
Not publishedQwen foundation with Callstack domain post-training for React and React Native

Full datasheets, every price and sourceMuse Wonder ↗Callstack Apex ↗

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.

Muse Wonder 52.3/100Rank 17/47

Survived 0 of 3
Foresight: complete playing field
Level 311 ptsTurn 17 / 20

Points per level

LevelMuse WonderCallstack Apex
Level 1Second Thoughts
16 ptsOut of lives
No run
Level 2Pressure Pot
10 ptsOut of lives
No run
Level 3Hide or Flight
11 ptsOut of lives
No run

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.

Muse Wonder 67.0/100Rank 17/48

Cleared 5 of 5
Latch: complete playing field
Level 520.6 ptsTurn 27 / 40

Callstack Apex 100.0/100Rank 40/481 of 5 levels

1 of 5 played
Latch: complete playing field
Level 15.2 ptsTurn 6 / 12

Points per level

LevelMuse WonderCallstack Apex
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9 ptsCleared
Pending
Level 3Relay vault
18.8 ptsCleared
Pending
Level 4Passing bay
17.8 ptsClearedFinished early · 1 beacon left
Not played
Level 5Second thoughts
20.6 ptsCleared
Not played

Newton's Mirror

Same task instructions

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

The judgment

Muse Wonder

The flattened cyan cap, separate airborne black blob and crimson droplets support much of the contact sequence, although crimson adhesion and forward carriage remain unresolved. Main-sphere placement is broadly compatible with the prescribed view. Sparse isolated mirror images replace the defining repeated room structure and curved nested reflections. The crimson mass is visibly oversized, and the top-center lamp image is missing.

Callstack Apex

The principal sphere placement and paint contact sequence are supported. Isolated sphere and panel images provide limited optical structure, but missing lateral chains and side-floor continuations prevent a coherent repeating mirror room. The main and reflected spheres lack ordered curved nested imagery, while sparse planar emitter images and incomplete spherical emitter mapping leave most of the reflection system unsupported.

Score breakdown

CategoryMuse WonderCallstack Apex
State at 600 ms22.0/2520.0/25
Camera and placement12.0/1513.0/15
Reflections21.5/12010.0/120
Materials and scale7.5/107.0/10
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

Muse Wonder

An appealing, coherent cartoon with a readable effortful expression and clear forefeet gripping the trunk. Soft colours and controlled contours support its tenderness. Smooth ears, stiff foreleg construction, limited surface texture and uncertain seed contact keep the execution below intricate illustration quality.

Callstack Apex

The cheerful yellow bird, cream eyes, orange features and miniature teal console closely match the brief. Clean block edges, restrained colors and soft shadows create an appealing composition. The body reads more like a gridded disc than a fully cubic sphere, and the outlined left wing has limited volume. The right wing reaches the cyan block, though its grip is ambiguous.

Score breakdown

CategoryMuse WonderCallstack Apex
Task & likeness7.5/108.5/10
Anatomy & construction7.0/107.0/10
Space & placement7.5/107.5/10
Light & reflections7.0/107.5/10
Purposeful detail7.5/107.5/10
Artistry & character6.5/107.0/10
Materials & effects6.5/107.0/10
Visual integrity8.0/107.5/10

Benchmark task

Muse Wonder

A small elephant protecting a delicate seed tests expressive anatomy, physical contact and contrasting organic materials.

Callstack Apex

A rounded bird built from small cubes explores a miniature machine. The scene tests block construction, expressive proportions, contact and soft lighting.

Mona Lisa

Same task instructions

Precise visual recall and portrait reconstruction.

The judgment

Muse Wonder

A competent illustrative interpretation with controlled curves, readable details and coherent depth layers. Facial, hair and garment shading demonstrate more development than basic construction. Replication remains limited by the frontal pose, elongated face and pronounced smile; crowded fingers, weak contact shadows and smooth materials constrain anatomical and painterly conviction.

Callstack Apex

The framed portrait recalls Mona Lisa through dark hair, folded arms and a hazy landscape. Replication is limited by wide, staring eyes, an elongated neck and a downturned mouth. The overlapping hands lack convincing finger and wrist construction. Soft tonal shading suggests volume, but pervasive blur obscures clothing, landscape and anatomical detail.

Score breakdown

CategoryMuse WonderCallstack Apex
Task & likeness5.5/103.5/10
Anatomy & construction5.5/104.0/10
Space & placement5.5/104.5/10
Light & reflections5.5/106.0/10
Purposeful detail5.5/104.5/10
Artistry & character5.5/104.5/10
Materials & effects5.0/105.5/10
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

Same task instructions

Creativity, perspective and visual beauty.

The judgment

Muse Wonder

A lively beach illustration with expressive animals, controlled colour transitions and unusually readable accessories. Connected graphic forms make the activities recognizable. Crowded overlaps, compressed depth, schematic joints, weak directional shadows and limited material variation constrain its physical coherence and refinement.

Callstack Apex

A cohesive sunset beach illustration with lively wildlife, playful accents, and an appealing warm-to-purple palette. Palm framing and the aligned sun reflection organize the scene, while connected silhouettes keep the activities readable. Schematic joints, ambiguous dolphin junctions, loosely matched reflections, and repetitive surface marks limit construction, lighting coherence, and material depth.

Score breakdown

CategoryMuse WonderCallstack Apex
Task & likeness8.5/108.5/10
Anatomy & construction6.0/104.5/10
Space & placement6.5/107.5/10
Light & reflections6.5/105.5/10
Purposeful detail9.0/107.5/10
Artistry & character7.0/106.5/10
Materials & effects6.0/107.0/10
Visual integrity7.0/104.0/10

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

Ground Truth

Same task instructions

Physical reasoning, light and visual reconstruction.

The judgment

Muse Wonder

This benchmark has not been assessed yet.

Callstack Apex

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

Multiple instruction versions

Scene composition and interacting subjects.

The judgment

Muse Wonder

An expressive, coherent cartoon demonstrates the requested riding and steering interaction. Clean contours, differentiated accessories and energetic spray support its appeal. Concealed seated contacts, compressed vehicle perspective and weak directional lighting limit physical resolution despite the detailed presentation.

Callstack Apex

The raccoon clearly rides the dog's back, and the dog's paws reach the jet ski controls. Expressive faces, a sweeping tail and a strong sunset composition give the illustration character. Limbs remain connected, but the dog's foreleg joints and vehicle seating are loosely constructed. Angular splashes convey speed more successfully than convincing water displacement; lighting and reflections remain decorative.

Score breakdown

CategoryMuse WonderCallstack Apex
Task & likeness7.5/109.0/10
Anatomy & construction5.5/107.0/10
Space & placement6.5/107.5/10
Light & reflections4.5/107.0/10
Purposeful detail7.5/108.5/10
Artistry & character5.5/107.5/10
Materials & effects7.0/107.0/10
Visual integrity7.0/108.0/10

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

Same task instructions

Subject construction and spatial relationships.

The judgment

Muse Wonder

A controlled, expressive seaside illustration with a distinctive pelican, coherent bicycle geometry and successfully resolved graphic detail. Visible pedal support and plausible occlusion strengthen the riding construction. Aligned wheels and layered scenery establish placement. Limited cast shadows, simplified leg articulation and restrained material modeling constrain its physical finish.

Callstack Apex

An appealing cartoon with a distinctive pelican, expressive eye, warm bill and carefully drawn bicycle wheels. The wing reaches the handlebar, but the feet do not clearly engage the pedals, weakening the riding mechanics. Layered hills create depth; limited ground shadows weaken contact. Clean curves and purposeful feather details give the illustration polish.

Score breakdown

CategoryMuse WonderCallstack Apex
Task & likeness8.5/108.5/10
Anatomy & construction6.0/106.5/10
Space & placement7.5/107.5/10
Light & reflections5.5/107.5/10
Purposeful detail8.5/108.0/10
Artistry & character7.5/108.0/10
Materials & effects6.0/107.5/10
Visual integrity8.0/108.0/10

Benchmark task

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