Claude Haiku 5.5 34.4/100Rank 27/50

STEALTHMARK · HEAD TO HEAD
All comparisons ↗GPT-6.1 Terra leads Claude Haiku 5.5 by 10.9 points on StealthMark, 60.4 to 49.5. It leads on 8 of 9 benchmarks, including Foresight, and Claude Haiku 5.5 on 1, including Latch. GPT-6.1 Terra scores higher on Raccoon, with its largest category advantage in anatomy & construction.
See the difference ↘On every task, result quality and reasoning tokens are each compared with all measured models and weighed equally. Each dot is one model.
BENCHMARK BY BENCHMARK
DATASHEET
Claude Haiku 5.5 is 10× cheaper per output token. GPT-6.1 Terra scores higher on StealthMark. Both take about 1M tokens of context.
Full datasheets, every price and sourceClaude Haiku 5.5 ↗GPT-6.1 Terra ↗
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 Haiku 5.5
The centered sphere, compact airborne black blob and differentiated cyan/crimson interaction support substantial state and placement credit. The few recognizable sphere and panel images establish limited optical relationships, but most of the required mirror system is missing. Rounded volume and localized paint warrant substantial material credit despite the soft, illustrative finish.
GPT-6.1 Terra
The sphere, airborne black and first reflected silhouettes preserve important geometry within the portrait frame. Paint deformation, contact order and forward transport are supported, with a small crimson endpoint overshoot. Major optical omissions dominate: short finite reflection sequences and smooth bands replace extensive, spatially ordered mirror imagery. Dark gloss and crisp upper emitter shapes provide partial material credit.
| Category | Claude Haiku 5.5 | GPT-6.1 Terra |
|---|---|---|
| State at 600 ms | 25.0/25 | 23.0/25 |
| Camera and placement | 8.0/15 | 11.0/15 |
| Reflections | 24.5/120 | 33.0/120 |
| Materials and scale | 7.5/10 | 7.5/10 |
| 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 Haiku 5.5
A coherent coral squid emblem with a compact mantle, restrained face and clean centered presentation. Its radial silhouette and floating placement work, but sharp arm tips, crowded roots and sparse surface modeling limit softness, construction and finish.
GPT-6.1 Terra
A balanced serpent emblem with six attached outward heads, delicate scales and softly rounded bodies. Its compact silhouette reads clearly, but central routing does not establish every alternating crossing or crisp inward corner. Repetitive texture, limited facial anatomy and weak contact shadows constrain its organic character.
| Category | Claude Haiku 5.5 | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 6.5/10 | 7.5/10 |
| Anatomy & construction | 4.0/10 | 6.5/10 |
| Space & placement | 6.5/10 | 6.5/10 |
| Light & reflections | 4.0/10 | 6.0/10 |
| Purposeful detail | 3.5/10 | 6.5/10 |
| Artistry & character | 3.5/10 | 6.5/10 |
| Materials & effects | 4.5/10 | 6.0/10 |
| Visual integrity | 7.0/10 | 6.0/10 |
Claude Haiku 5.5
A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.
GPT-6.1 Terra
A pale serpent woven into an interlocking knot tests connected anatomy, repeated structure and readable overlaps. Organic surface detail must work with the overall geometry.
Precise visual recall and portrait reconstruction.


Claude Haiku 5.5
A recognizable but basic Mona Lisa reinterpretation. Clean contours and smooth facial lighting provide coherence and volume. Replication remains limited by the frontal pose, elongated neck, schematic expression, unresolved crossed hands and sparse landscape. Lighting is more successful than anatomical construction and purposeful detail.
GPT-6.1 Terra
A recognizable interpretation with developed facial shading, shaped sleeve folds and purposeful small features. These strengths support modest upward calibration, while the frontal torso, elongated proportions, schematic finger joints and unresolved seated support keep replication and construction uneven.
| Category | Claude Haiku 5.5 | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 3.0/10 | 5.5/10 |
| Anatomy & construction | 4.0/10 | 6.5/10 |
| Space & placement | 4.0/10 | 4.5/10 |
| Light & reflections | 5.5/10 | 6.5/10 |
| Purposeful detail | 2.5/10 | 6.0/10 |
| Artistry & character | 3.5/10 | 6.0/10 |
| Materials & effects | 2.5/10 | 6.0/10 |
| Visual integrity | 5.5/10 | 6.5/10 |
An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.
Creativity, perspective and visual beauty.


Claude Haiku 5.5
A cheerful, coherent beach illustration with attractive sunset colors, readable accessories and clean silhouettes. Its sun and sailboat reflections establish useful physical relationships. Simple animal construction, flattened foreground placement, sparse directional shadows and minimally differentiated surfaces limit its drawing refinement.
GPT-6.1 Terra
A coherent sunset illustration with clear prompt fulfillment, controlled framing and varied, purposeful small details. Simplified joints, frontal staging, flattened animal forms and weakly directional shadows limit its anatomical, spatial and physical sophistication.
| Category | Claude Haiku 5.5 | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 8.5/10 | 8.5/10 |
| Anatomy & construction | 6.5/10 | 7.5/10 |
| Space & placement | 7.0/10 | 6.5/10 |
| Light & reflections | 7.0/10 | 5.5/10 |
| Purposeful detail | 7.0/10 | 7.5/10 |
| Artistry & character | 6.0/10 | 7.0/10 |
| Materials & effects | 6.0/10 | 6.5/10 |
| Visual integrity | 8.5/10 | 7.5/10 |
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 Haiku 5.5
This benchmark has not been assessed yet.
GPT-6.1 Terra
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 Haiku 5.5
A tidy, appealing cartoon with recognizable animals and a pleasing sunset palette. Steering lacks visible controls, while schematic limbs and uncertain raccoon support weaken the requested interaction. Shallow vehicle construction, flat character lighting and modest displacement limit physical coherence. Clean shapes and readable identifying details remain strengths.
GPT-6.1 Terra
A coherent cartoon with expressive animals, readable steering and a clear wake. Fine facial and hull details reward inspection. The main limits are the boatlike craft, simplified joints, weakly braced frontal raccoon and minimal directional lighting or material depth.
| Category | Claude Haiku 5.5 | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 4.0/10 | 6.5/10 |
| Anatomy & construction | 3.5/10 | 5.5/10 |
| Space & placement | 5.5/10 | 6.0/10 |
| Light & reflections | 4.0/10 | 5.0/10 |
| Purposeful detail | 5.5/10 | 7.0/10 |
| Artistry & character | 4.5/10 | 6.0/10 |
| Materials & effects | 5.5/10 | 6.0/10 |
| Visual integrity | 4.5/10 | 7.0/10 |
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 Haiku 5.5
A cheerful, recognizable illustration with clean contours and a balanced warm palette. Aligned wheels and readable frame geometry establish the bicycle, but shoulder construction, feet and steering contact remain imprecise. Sparse drivetrain detail, flat materials and absent grounding shadows limit anatomical and spatial conviction.
GPT-6.1 Terra
A coherent pelican cyclist with expressive proportions, purposeful feather detail and developed bicycle machinery. Continuous body contours, aligned wheels and readable pedal contacts support the scene. Simplified articulation, shallow modelling and an unresolved steering connection limit construction and placement.
| Category | Claude Haiku 5.5 | GPT-6.1 Terra |
|---|---|---|
| Task & likeness | 8.0/10 | 7.0/10 |
| Anatomy & construction | 5.5/10 | 7.0/10 |
| Space & placement | 6.5/10 | 6.0/10 |
| Light & reflections | 5.0/10 | 5.5/10 |
| Purposeful detail | 6.0/10 | 7.0/10 |
| Artistry & character | 5.0/10 | 6.5/10 |
| Materials & effects | 5.0/10 | 5.5/10 |
| Visual integrity | 8.0/10 | 6.0/10 |
A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.