Claude Fable 5.1 34.2/100Rank 41/522 of 3 levels

STEALTHMARK · HEAD TO HEAD
All comparisons ↗Claude Fable 5.1 leads Crouton Alpha by 15.0 points on StealthMark, 63.0 to 48.0. It leads on 8 of 9 benchmarks, including Latch, and Crouton Alpha on 1, including Foresight. Claude Fable 5.1 scores higher on Newton's Mirror, with its largest category advantage in reflections.
See the difference ↘How many reasoning tokens a model needs for the quality it delivers.
How much Performance you get for your money.
BENCHMARK BY BENCHMARK
DATASHEET
Claude Fable 5.1 scores higher on StealthMark. Crouton Alpha runs 44% faster in our speed test.
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.


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.


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


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.
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.
| Category | Claude Fable 5.1 | Crouton Alpha |
|---|---|---|
| State at 600 ms | 24.0/25 | 19.0/25 |
| Camera and placement | 14.0/15 | 11.0/15 |
| Reflections | 48.0/120 | 21.5/120 |
| Materials and scale | 7.5/10 | 6.0/10 |
| Floor-damage reward | 0.0/10 | 0.0/10 |
A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.
Visual construction and creative interpretation.


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.
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.
| Category | Claude Fable 5.1 | Crouton Alpha |
|---|---|---|
| Task & likeness | 6.5/10 | 6.5/10 |
| Anatomy & construction | 7.0/10 | 5.5/10 |
| Space & placement | 7.5/10 | 6.5/10 |
| Light & reflections | 6.5/10 | 5.5/10 |
| Purposeful detail | 6.0/10 | 7.0/10 |
| Artistry & character | 7.0/10 | 5.0/10 |
| Materials & effects | 6.5/10 | 5.5/10 |
| Visual integrity | 8.0/10 | 7.5/10 |
Claude Fable 5.1
A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.
Crouton Alpha
Character scenes test expression, anatomy, materials and coherent visual construction.
Precise visual recall and portrait reconstruction.


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.
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.
| Category | Claude Fable 5.1 | Crouton Alpha |
|---|---|---|
| Task & likeness | 5.5/10 | 4.5/10 |
| Anatomy & construction | 6.0/10 | 4.0/10 |
| Space & placement | 6.0/10 | 4.5/10 |
| Light & reflections | 6.0/10 | 5.0/10 |
| Purposeful detail | 5.0/10 | 4.0/10 |
| Artistry & character | 5.5/10 | 4.5/10 |
| Materials & effects | 6.0/10 | 4.0/10 |
| Visual integrity | 6.5/10 | 6.0/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


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.
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.
| Category | Claude Fable 5.1 | Crouton Alpha |
|---|---|---|
| Task & likeness | 8.5/10 | 8.5/10 |
| Anatomy & construction | 7.0/10 | 5.0/10 |
| Space & placement | 7.0/10 | 5.5/10 |
| Light & reflections | 7.0/10 | 5.5/10 |
| Purposeful detail | 7.5/10 | 7.0/10 |
| Artistry & character | 7.5/10 | 5.0/10 |
| Materials & effects | 6.5/10 | 5.5/10 |
| Visual integrity | 7.5/10 | 7.0/10 |
A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.
Physical reasoning, light and visual reconstruction.


Claude Fable 5.1
This benchmark has not been assessed yet.
Crouton Alpha
This benchmark has not been assessed yet.
A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.
Scene composition and interacting subjects.


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.
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.
| Category | Claude Fable 5.1 | Crouton Alpha |
|---|---|---|
| Task & likeness | 8.5/10 | 7.0/10 |
| Anatomy & construction | 6.5/10 | 5.0/10 |
| Space & placement | 7.0/10 | 6.0/10 |
| Light & reflections | 5.5/10 | 6.0/10 |
| Purposeful detail | 7.0/10 | 6.5/10 |
| Artistry & character | 7.0/10 | 5.0/10 |
| Materials & effects | 6.5/10 | 5.5/10 |
| Visual integrity | 7.5/10 | 6.0/10 |
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.
Subject construction and spatial relationships.


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.
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.
| Category | Claude Fable 5.1 | Crouton Alpha |
|---|---|---|
| Task & likeness | 8.5/10 | 7.0/10 |
| Anatomy & construction | 7.0/10 | 5.0/10 |
| Space & placement | 7.5/10 | 5.5/10 |
| Light & reflections | 6.0/10 | 5.5/10 |
| Purposeful detail | 7.0/10 | 6.5/10 |
| Artistry & character | 7.0/10 | 5.5/10 |
| Materials & effects | 6.0/10 | 5.0/10 |
| Visual integrity | 8.0/10 | 6.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.