STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Cat Jam Free vs Claude Fable 5.1

Claude Fable 5.1 leads Cat Jam Free by 28.5 points on StealthMark, 62.0 to 33.5. It leads on 8 of 9 benchmarks, including Latch, and Cat Jam Free on 1, including Foresight. Claude Fable 5.1 scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
Model guide ↗
All results ↗

Overall StealthMark

33.5/100Overall rank 40/53
62.0/100Overall rank 8/53

General Intelligence

27.7/100
58.9/100

Visual Intelligence

43.0/100
67.1/100

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

Open or local

NeitherApache-2.0

BENCHMARK BY BENCHMARK

Where each model leads

  • Cat Jam Free
  • Claude Fable 5.1
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Cat Jam Free
  • Claude Fable 5.1
  • Other models
  • Median
PricePer 1M output tokens, input below
Cat Jam Free: No list priceClaude Fable 5.1: $50$10 input
Context windowTokens per request, max output below
Cat Jam Free: Not publishedClaude Fable 5.1: 1M128K max output
Output speedTokens per second, our measurement
Cat Jam Free: Not measuredClaude Fable 5.1: 122tokens/s
Developer
Not publishedAnthropic
Released
Not published1 Sep 2026
Origin
Not publishedUnited States
Input → output
Not publishedText, image → text

Full datasheets, every price and sourceClaude Fable 5.1 ↗

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.

Cat Jam Free 33.8/100Rank 26/47

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

Claude Fable 5.1 34.2/100Rank 37/472 of 3 levels

2 of 3 played
Foresight: complete playing field
Level 38 ptsTurn 17 / 20

Points per level

LevelCat Jam FreeClaude Fable 5.1
Level 1Second Thoughts
5 ptsOut of lives
21 ptsOut of lives
Level 2Pressure Pot
6 ptsOut of lives
Pending
Level 3Hide or Flight
9 ptsSurvived
8 ptsOut of lives

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.

Cat Jam Free 33.9/100Rank 33/48

Cleared 2 of 5
Latch: complete playing field
Level 56 ptsTurn 25 / 40

Claude Fable 5.1 80.2/100Rank 24/483 of 5 levels

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

Points per level

LevelCat Jam FreeClaude Fable 5.1
Level 1Hold the door
5.2 ptsCleared
Pending
Level 2Crossfeed
9.8 ptsCleared
9.8 ptsCleared
Level 3Relay vault
10 ptsFinished early
Pending
Level 4Passing bay
10.8 ptsFinished early
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
6 ptsFinished early
20.6 ptsCleared

Newton's Mirror

Same task instructions

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

The judgment

Cat Jam Free

The image conveys a supported central sphere, separate black paint and crimson below cyan. Its contact and transport story is partially resolved. The exterior cutaway camera and largely missing mirror system dominate the limitations; isolated discs and smooth highlights provide little coherent optical structure.

Claude Fable 5.1

The broad paint sequence, bilateral near-field sphere arrangement, overlaps and diminishing panel repetitions are recognizable; crimson is slightly too low. Small paint scale and basic shading provide material cues, although the steel response remains soft. Inaccurate light projections, missing outer chains and incomplete nested room imagery remain the principal limitations.

Score breakdown

CategoryCat Jam FreeClaude Fable 5.1
State at 600 ms14.0/2524.0/25
Camera and placement4.0/1514.0/15
Reflections3.5/12048.0/120
Materials and scale4.0/107.5/10
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

Cat Jam Free

A coherent, restrained cat illustration captures the pale palette and intent eyes. Its central expressive requirement—the committed forward-and-down neck bob—is insufficiently articulated. Simple geometry, faint paw construction and minimal surface detail limit the physical presence and finish.

Claude Fable 5.1

The coral palette, friendly face, matte shading and cream arch create a coherent emblem. However, the mantle is elongated rather than compact, and the appendages spread mostly sideways and downward instead of forming an evenly spaced, flower-like starburst. Two thin hanging appendages weaken the thick-arm motif. Clean contours and balanced framing support the simple design.

Score breakdown

CategoryCat Jam FreeClaude Fable 5.1
Task & likeness5.5/106.5/10
Anatomy & construction5.5/107.0/10
Space & placement6.0/107.5/10
Light & reflections6.0/106.5/10
Purposeful detail4.0/106.0/10
Artistry & character5.5/107.0/10
Materials & effects5.0/106.5/10
Visual integrity6.5/108.0/10

Benchmark task

Cat Jam Free

An ivory cat nods intently to music beside a tiny speaker. The scene tests feline anatomy, movement conveyed through a still pose and the contrast between pale fur and woven fabric.

Claude Fable 5.1

A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Cat Jam Free

The portrait is recognizable and cleanly assembled, but replication remains basic. Its frontal symmetry, elongated silhouette, simplified facial likeness and unresolved hands differ markedly from the original. Modest skin gradients provide volume, while clothing and landscape rely on broad, flat shapes.

Claude Fable 5.1

The dark clothing, crossed hands and hazy landscape establish the Mona Lisa composition. Replication is limited by the frontal, elongated face, wide eyes and simplified smile. Rounded, parallel fingers and unclear wrist transitions weaken the hands. Warm facial shading gives some volume, but broad garment shapes and scattered crack marks substitute for convincing folds and painterly detail.

Score breakdown

CategoryCat Jam FreeClaude Fable 5.1
Task & likeness2.5/105.5/10
Anatomy & construction2.0/106.0/10
Space & placement4.0/106.0/10
Light & reflections3.5/106.0/10
Purposeful detail3.0/105.0/10
Artistry & character3.0/105.5/10
Materials & effects2.5/106.0/10
Visual integrity5.5/106.5/10

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

Cat Jam Free

The scene clearly supplies the requested beach subjects and playful activity. Clean silhouettes and warm gradients support readability, but elementary drawing, ambiguous parasol construction, weak grounding and a rigid sun reflection limit its depth and finish.

Claude Fable 5.1

The colorful sunset, layered shoreline, animals, kite and beach toys fulfill the lively beach brief. Clean silhouettes and a balanced composition give the illustration character. Construction is simplified: the umbrella resembles a segmented fan, dolphins have weak water interaction, and the sun’s reflection forms a rigid widening wedge. Flat surfaces and sparse contact shadows limit depth.

Score breakdown

CategoryCat Jam FreeClaude Fable 5.1
Task & likeness7.0/108.5/10
Anatomy & construction4.5/107.0/10
Space & placement4.5/107.0/10
Light & reflections4.0/107.0/10
Purposeful detail4.0/107.5/10
Artistry & character4.5/107.5/10
Materials & effects4.5/106.5/10
Visual integrity5.5/107.5/10

Benchmark task

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

Ground Truth

Same task instructions

Physical reasoning, light and visual reconstruction.

The judgment

Cat Jam Free

This benchmark has not been assessed yet.

Claude Fable 5.1

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

Same task instructions

Scene composition and interacting subjects.

The judgment

Cat Jam Free

An appealing cartoon demonstrates the back-riding arrangement through expressive faces and clean shapes. Uncertain steering contact, indistinct deck support and weak hull-water interaction limit physical coherence. Smooth gradients add volume, but simple rounded construction and sparse material detail constrain complexity and finish.

Claude Fable 5.1

The raccoon rides on the dog's back, and the dog's extended foreleg reaches the jet ski controls. Expressive faces, a clear silhouette and sweeping spray make the action readable. Limb and handlebar overlaps weaken construction; broad shading provides limited volume, and the glowing sun has little corresponding reflection on the water. Clean vector shapes support an appealing but simplified illustration.

Score breakdown

CategoryCat Jam FreeClaude Fable 5.1
Task & likeness6.0/108.5/10
Anatomy & construction5.0/106.5/10
Space & placement5.0/107.0/10
Light & reflections5.0/105.5/10
Purposeful detail6.0/107.0/10
Artistry & character5.0/107.0/10
Materials & effects5.0/106.5/10
Visual integrity4.5/107.5/10

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

Cat Jam Free

A coherent cartoon with readable bicycle placement, controlled outlines and modest surface shading. The separated-looking upper bill weakens pelican likeness; schematic limbs, uncertain gripping contact and simplified mechanics constrain construction. Opaque wheel interiors flatten spatial relationships. Limited feather complexity and directional lighting keep the finish modest.

Claude Fable 5.1

The pelican reads clearly, with an expressive face, prominent bill and appealing composition. Both legs connect to the body, but the far foot's pedal contact and the wing's steering grip remain unclear. Wheel alignment and background layers are coherent. Clean contours and feather lines give polish, while schematic machinery, limited surface texture and weak directional lighting constrain the finish.

Score breakdown

CategoryCat Jam FreeClaude Fable 5.1
Task & likeness7.0/108.5/10
Anatomy & construction5.0/107.0/10
Space & placement6.0/107.5/10
Light & reflections5.0/106.0/10
Purposeful detail5.5/107.0/10
Artistry & character5.5/107.0/10
Materials & effects6.5/106.0/10
Visual integrity6.5/108.0/10

Benchmark task

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