STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Crouton Alpha vs Callstack Apex

Callstack Apex leads Crouton Alpha by 1.5 points on StealthMark, 49.5 to 48.0. It leads on 5 of the 8 benchmarks with results for both and Crouton Alpha on 3, including Latch. Crouton Alpha scores higher on Ground Truth.

See the difference ↘
Model guide ↗
Model guide ↗

Overall StealthMark

48.0/100Overall rank 23/56
49.5/100Overall rank 20/56

General Intelligence

43.5/100
40.4/100

Visual Intelligence

56.0/100
59.6/100

Reasoning efficiency

How many reasoning tokens a model needs for the quality it delivers.

Single-step reasoning How much it reasons to understand a task

Multi-step reasoning How much it keeps reasoning as a task goes on

Cost efficiency

How much Performance you get for your money.

  • Crouton AlphaNot measured

Open or local

BENCHMARK BY BENCHMARK

Where each model leads

  • Crouton Alpha
  • Callstack Apex
  • Other models
  • Median

DATASHEET

Specs and pricing

Callstack Apex scores higher on StealthMark and runs 46% faster in our speed test.

  • Crouton Alpha
  • Callstack Apex
  • Other models
  • Median
PricePer 1M output tokens, input below
Crouton Alpha: No list priceCallstack Apex: $3$0.50 input
Context windowTokens per request, max output below
Crouton Alpha: Not publishedCallstack Apex: 256K
Output speedTokens per second, our measurement
Crouton Alpha: 175tokens/sCallstack Apex: 25546% fastertokens/s
Developer
Not publishedCallstack
Released
Not published1 Oct 2026
Origin
Not publishedPoland
Input → output
Not publishedText → text
Architecture
Not publishedQwen foundation with Callstack domain post-training for React and React Native

Full datasheets, every price and sourceCallstack 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.

Crouton Alpha 32.3/100Rank 29/52

Survived 1 of 3
Foresight: complete playing field
Level 39 ptsTurn 20 / 20

Points per level

LevelCrouton AlphaCallstack Apex
Level 1Second Thoughts
3 ptsOut of lives
No run
Level 2Pressure Pot
7 ptsOut of lives
No run
Level 3Hide or Flight
9 ptsSurvived
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.

Crouton Alpha 59.5/100Rank 24/53

Cleared 4 of 5
Latch: complete playing field
Level 520.2 ptsTurn 29 / 40

Callstack Apex 100.0/100Rank 45/531 of 5 levels

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

Points per level

LevelCrouton AlphaCallstack Apex
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.4 ptsCleared
Pending
Level 3Relay vault
11.2 ptsFinished early
Pending
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
Not played
Level 5Second thoughts
20.2 ptsCleared
Not played

Newton's Mirror

Same task instructions

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

The judgment

Crouton Alpha

The artwork establishes approximate central placement, a separate airborne black blob, and basic wall and floor sphere images. Its defining weaknesses are the largely absent recursive reflection system, missing emitter mappings, satin steel appearance and unresolved paint interaction. The black lateral wedges do not establish a separate viewport, and the hidden floor contact does not establish a gap. The category values remain unchanged.

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

CategoryCrouton AlphaCallstack Apex
State at 600 ms19.0/2520.0/25
Camera and placement11.0/1513.0/15
Reflections21.5/12010.0/120
Materials and scale6.0/107.0/10
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

Crouton Alpha

A cheerful, readable cartoon captures the crouton's signature expression and many specific accessories. Coherent cube geometry and foreground foreshortening support the selfie. Simple construction and flat material treatment limit its sophistication, while the tipping raft, advancing soup and unnoticed soaking remain insufficiently clear.

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

CategoryCrouton AlphaCallstack Apex
Task & likeness6.5/108.5/10
Anatomy & construction5.5/107.0/10
Space & placement6.5/107.5/10
Light & reflections5.5/107.5/10
Purposeful detail7.0/107.5/10
Artistry & character5.0/107.0/10
Materials & effects5.5/107.0/10
Visual integrity7.5/107.5/10

Benchmark task

Crouton Alpha

Character scenes test expression, anatomy, materials and coherent visual construction.

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

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Crouton Alpha

A recognizable, coherent simplification with readable eyes, a restrained smile and modest facial volume. Frontal symmetry, an oversized head, capsule-like hands and geometric scenery substantially limit likeness, anatomy and depth. Clean contours preserve basic integrity but do not establish sophisticated construction or finish.

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

CategoryCrouton AlphaCallstack Apex
Task & likeness4.5/103.5/10
Anatomy & construction4.0/104.0/10
Space & placement4.5/104.5/10
Light & reflections5.0/106.0/10
Purposeful detail4.0/104.5/10
Artistry & character4.5/104.5/10
Materials & effects4.0/105.5/10
Visual integrity6.0/105.5/10

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

Crouton Alpha

A colorful, readable sunset beach scene with playful subjects and a clear central reflection. Purposeful equipment and animal details reward inspection, and the principal attachments remain intact. Basic geometric anatomy, mixed viewpoints and sparse directional shadows limit its construction and depth; smooth gradients provide atmosphere with little material differentiation.

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

CategoryCrouton AlphaCallstack Apex
Task & likeness8.5/108.5/10
Anatomy & construction5.0/104.5/10
Space & placement5.5/107.5/10
Light & reflections5.5/105.5/10
Purposeful detail7.0/107.5/10
Artistry & character5.0/106.5/10
Materials & effects5.5/107.0/10
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

Crouton Alpha

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

Crouton Alpha

A readable cartoon with expressive faces, purposeful markings and clear water motion. Hull shading and an underside shadow establish modest depth. The dog contacts the controls, but the raccoon's frontal pose leaves its seated weight unresolved. Simple anatomy and limited shared perspective constrain the drawing.

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

CategoryCrouton AlphaCallstack Apex
Task & likeness7.0/109.0/10
Anatomy & construction5.0/107.0/10
Space & placement6.0/107.5/10
Light & reflections6.0/107.0/10
Purposeful detail6.5/108.5/10
Artistry & character5.0/107.5/10
Materials & effects5.5/107.0/10
Visual integrity6.0/108.0/10

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

Crouton Alpha

A recognizable, expressive pelican cyclist with purposeful feather and bicycle detail. Readable steering reach, connected machinery and modest body shading earn additional credit. Jointless legs, uncertain pedal engagement and unclear seated support keep the central action only partially resolved; shallow space and simple materials further limit the illustration.

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

CategoryCrouton AlphaCallstack Apex
Task & likeness7.0/108.5/10
Anatomy & construction5.0/106.5/10
Space & placement5.5/107.5/10
Light & reflections5.5/107.5/10
Purposeful detail6.5/108.5/10
Artistry & character5.5/108.0/10
Materials & effects5.0/107.5/10
Visual integrity6.0/108.0/10

Benchmark task

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