STEALTHMARK · HEAD TO HEAD

All comparisons ↗

DeepSeek-V4.1-Flash-1017 vs Callstack Apex

DeepSeek-V4.1-Flash-1017 leads Callstack Apex by 9.7 points on StealthMark, 59.2 to 49.5. It leads on 5 of the 8 benchmarks with results for both, including Latch, and Callstack Apex on 3. DeepSeek-V4.1-Flash-1017 scores higher on Newton's Mirror, with its largest category advantage in reflections.

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All results ↗
Model guide ↗

Overall StealthMark

59.2/100Overall rank 9/53
49.5/100Overall rank 18/53

General Intelligence

56.8/100
40.4/100

Visual Intelligence

63.5/100
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

Open or local

Open modelMIT

BENCHMARK BY BENCHMARK

Where each model leads

  • DeepSeek-V4.1-Flash-1017
  • Callstack Apex
  • Other models
  • Median

DATASHEET

Specs and pricing

DeepSeek-V4.1-Flash-1017 scores higher on StealthMark, is 2.5× cheaper per output token, takes 3.8× more context and runs 21% faster in our speed test.

  • DeepSeek-V4.1-Flash-1017
  • Callstack Apex
  • Other models
  • Median
PricePer 1M output tokens, input below
DeepSeek-V4.1-Flash-1017: $1.202.5× cheaper$0.30 inputCallstack Apex: $3$0.50 input
Context windowTokens per request, max output below
DeepSeek-V4.1-Flash-1017: 1M3.8× larger384K max outputCallstack Apex: 256K
Output speedTokens per second, our measurement
DeepSeek-V4.1-Flash-1017: 31021% fastertokens/sCallstack Apex: 255tokens/s
SizeTotal and active parameters
DeepSeek-V4.1-Flash-1017: 763B16B activeEstimatedCallstack Apex: Not disclosed
Developer
DeepSeek-AICallstack
Released
17 Oct 20261 Oct 2026
Origin
ChinaPoland
Input → output
Text, image → textText → text
Architecture
Sparse mixture-of-experts with a causal encoder-decoder design and native image understanding.Qwen foundation with Callstack domain post-training for React and React Native

Full datasheets, every price and sourceDeepSeek-V4.1-Flash-1017 ↗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.

DeepSeek-V4.1-Flash-1017 52.9/100Rank 15/47

Survived 1 of 3
Foresight: complete playing field
Level 310 ptsTurn 15 / 20

Points per level

LevelDeepSeek-V4.1-Flash-1017Callstack Apex
Level 1Second Thoughts
26 ptsSurvived
No run
Level 2Pressure Pot
7 ptsOut of lives
No run
Level 3Hide or Flight
10 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.

DeepSeek-V4.1-Flash-1017 73.9/100Rank 13/48

Cleared 5 of 5
Latch: complete playing field
Level 520 ptsTurn 30 / 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

LevelDeepSeek-V4.1-Flash-1017Callstack Apex
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
9.8 ptsCleared
Pending
Level 3Relay vault
19.2 ptsCleared
Pending
Level 4Passing bay
16.4 ptsClearedFinished early · 3 beacons left
Not played
Level 5Second thoughts
20 ptsCleared
Not played

Newton's Mirror

Same task instructions

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

The judgment

DeepSeek-V4.1-Flash-1017

Principal sphere and airborne-black placements are supported, and diminishing bilateral chains provide limited optical structure. Missing nested imagery, incomplete outer chains, distorted first images and sparse emitter recurrence remain the dominant weaknesses. Oversized paint bodies and unresolved cyan contact impose separate limitations.

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

CategoryDeepSeek-V4.1-Flash-1017Callstack Apex
State at 600 ms23.0/2520.0/25
Camera and placement13.5/1513.0/15
Reflections34.0/12010.0/120
Materials and scale8.5/107.0/10
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

DeepSeek-V4.1-Flash-1017

An expressive, intricately drawn storybook scene with a complete flowing silhouette and differentiated glossy materials. The supported main lens and continuous shrimp body make the central interaction readable, but reciprocal eye lines, facial magnification and the smaller lens grip remain ambiguous. Bright granular fringes and crowded accessory lines limit the finish.

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

CategoryDeepSeek-V4.1-Flash-1017Callstack Apex
Task & likeness7.5/108.5/10
Anatomy & construction7.5/107.0/10
Space & placement8.0/107.5/10
Light & reflections7.0/107.5/10
Purposeful detail7.5/107.5/10
Artistry & character8.0/107.0/10
Materials & effects7.5/107.0/10
Visual integrity6.5/107.5/10

Benchmark task

DeepSeek-V4.1-Flash-1017

A whale and a tiny shrimp examine one another through bubble lenses, with an octopus nearby. The scene tests interacting characters, differences in scale and transparent 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

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

DeepSeek-V4.1-Flash-1017

A coherent graphic interpretation with controlled contours, modeled facial volume and purposeful portrait details. Replication remains limited by the frontal pose, enlarged face, altered expression and ambiguous crossed hands. Landscape layering provides depth, while schematic fabric, smooth surfaces and tonal bands constrain the 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

CategoryDeepSeek-V4.1-Flash-1017Callstack Apex
Task & likeness5.0/103.5/10
Anatomy & construction5.0/104.0/10
Space & placement6.0/104.5/10
Light & reflections6.0/106.0/10
Purposeful detail5.5/104.5/10
Artistry & character5.5/104.5/10
Materials & effects5.5/105.5/10
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

DeepSeek-V4.1-Flash-1017

A coherent, colorful beach illustration with controlled curves, clean layering and varied readable accessories. Castle details and small animal features strengthen its finish. Schematic airborne animals, uncertain board support, shallow architectural depth and decorative reflections limit physical coherence and drawing sophistication.

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

CategoryDeepSeek-V4.1-Flash-1017Callstack Apex
Task & likeness7.0/108.5/10
Anatomy & construction5.5/104.5/10
Space & placement5.5/107.5/10
Light & reflections6.0/105.5/10
Purposeful detail6.5/107.5/10
Artistry & character5.0/106.5/10
Materials & effects5.5/107.0/10
Visual integrity4.5/104.0/10

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

DeepSeek-V4.1-Flash-1017

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

DeepSeek-V4.1-Flash-1017

An appealing cartoon with recognizable riders, expressive faces and a cohesive twilight palette. Clean shapes support the composition, but ambiguous limb overlaps, weak seat contact and loosely resolved steering limit physical coherence. Lighting and water effects are decorative, with modest material differentiation and drawing complexity.

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

CategoryDeepSeek-V4.1-Flash-1017Callstack Apex
Task & likeness8.0/109.0/10
Anatomy & construction7.0/107.0/10
Space & placement7.0/107.5/10
Light & reflections6.5/107.0/10
Purposeful detail7.0/108.5/10
Artistry & character7.0/107.5/10
Materials & effects6.5/107.0/10
Visual integrity8.0/108.0/10

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

DeepSeek-V4.1-Flash-1017

An expressive, controlled illustration with continuous body construction, substantial bicycle detail and effective landscape depth. Unclear foot-to-pedal and wing-to-handlebar contacts limit physical conviction and local readability. Purposeful detail and composition are stronger than directional lighting and material treatment.

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

CategoryDeepSeek-V4.1-Flash-1017Callstack Apex
Task & likeness8.5/108.5/10
Anatomy & construction7.0/106.5/10
Space & placement7.5/107.5/10
Light & reflections6.5/107.5/10
Purposeful detail7.5/108.0/10
Artistry & character7.0/108.0/10
Materials & effects7.0/107.5/10
Visual integrity7.5/108.0/10

Benchmark task

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