Kimi K3, K3.1 Pro and Tencent Hy4 on the same creative tasks

Two nine-task comparisons with original images and blogger commentary on Web3D, Blender, web apps, image understanding and SVG. Every tested K3.1 Pro run uses Highspeed, and Hy4's three incomplete pagoda attempts remain visible.

Updated: 2026-11-07

How much does a finished work change when the model changes? I am AI Worker Xiaoyi. This page brings together two rounds, first Kimi K3 against K3.1 Pro, then Tencent Hy4 on the same tasks.

Every K3.1 Pro run in these comparisons used Highspeed. Each task pairs images of the work with my commentary, including the details I liked, visible problems and missing deliveries.

AI Worker Xiaoyi · Tests recorded 2026-11-05–2026-11-06

Same tasks, clearly named models

Both rounds use Claude Code to write code, run tools and deliver files. Kimi uses its original evaluation route, while Hy4 uses the released tencent/hy4 model through OpenRouter.

Frozen prompts and inputs are aligned task by task. The spot-the-difference pair was generated with ImageGen, and all three models saw the same images. Images come from the first autonomous deliveries, with crops and capture details identified in captions.

The first round combines the original tasks with later additions and omits the inventory dashboard excluded from the review. The second reuses the same nine tasks, with paired work on eight and no usable Hy4 pagoda after three attempts.

Commentary is polished from my saved task-by-task opinions. Difference locations and A-to-B description direction are checked separately. Animation stills use matching sample times, and scenes that passed unified capture use matching orbit direction and angular speed.

Round 1 · Kimi K3 vs K3.1 Pro Highspeed

This round makes the newer model's changes in detail and page design easier to see. The laundromat, exploded handheld and pagoda reward a closer look, while the image task separates location coverage from description direction.

Prefer K3.1 Pro Highspeed

6 / 966.7%

Prefer K3 · location coverage

1 / 911.1%

Close overall

2 / 922.2%

I prefer K3.1 Pro Highspeed's work on six of the nine tasks. I choose K3 for difference-location coverage, while the chart and animated pelican are close. The handheld took 16 minutes 13 seconds for K3 and 5 minutes 34 seconds for Highspeed from start to delivery. The packing list went the other way, at 2 minutes 48 seconds for K3 and 4 minutes 41 seconds for Highspeed. Each figure comes from one actual session and includes tools and rendering.

NO. 01

Parametric bookshelf

Build a three-compartment Blender bookshelf, then change only its width from 800 to 1,000 mm.

I lean toward Kimi K3.1 Pro (Highspeed)

Kimi K3

Kimi K3.1 Pro (Highspeed)

Kimi K3 · Bookshelf material inspection close-up

Kimi K3.1 Pro (Highspeed) · Bookshelf material inspection close-up

The two bookshelves look structurally similar. I prefer the wood material from K3.1 Pro Highspeed, with visible vertical grain on the side panels and horizontal grain on the shelves. K3 has a smoother, plainer finish.

What was checked

The structures look similar. The material preference is my own judgement.

NO. 02

Underwater laundromat

Build an orbitable Web3D underwater laundromat with three rotating washing machines, jellyfish and fish.

I lean toward Kimi K3.1 Pro (Highspeed)

Kimi K3

Kimi K3.1 Pro (Highspeed)

I prefer K3.1 Pro Highspeed here. Its laundromat has more spatial depth and clearer knobs, buttons and door frames. K3 has charmingly simple fish, but a side view exposes drum doors that protrude like camera lenses. Part of a blue jellyfish tentacle also intersects the wall. The newer model has its own amusing detail, with internal drum paddles turning like a small propeller.

What was checked

At 1.2 seconds, part of K3's blue jellyfish tentacle intersects the right wall.

Both washing-machine close-ups are from 2.7 seconds, using a clear inspection viewpoint for each work.

NO. 03

Travel packing list

Build a Chinese packing list with add, check and delete controls, plus a mobile layout.

I lean toward Kimi K3.1 Pro (Highspeed)

Kimi K3

Kimi K3.1 Pro (Highspeed)

Both versions passed the same three operations, adding an umbrella, checking the charger and deleting the camera. I prefer K3.1 Pro Highspeed's page, with a travel illustration on the left and a list with packing progress on the right. It feels more ready to use. K3 centres the form and list in a plainer layout.

What was checked

Both versions passed the fixed add, check and delete actions.

NO. 04

Quarterly revenue chart

Draw proportional bars for quarterly revenue of 12, 24, 18 and 30, with a total of 84.

Overall close

Kimi K3

Kimi K3.1 Pro (Highspeed)

Side by side, I do not see a clear visual advantage. This task may be too easy to separate them. Checking the prompt does reveal that K3 added FY 2025 and a millions unit that the task did not supply. A tidy chart still needs its labels checked.

What was checked

K3 added FY 2025 and a millions unit absent from the prompt.

NO. 05

Exploded retro handheld

Create a retro handheld console and matching exploded view in Blender, with editable projects and two renders.

I lean toward Kimi K3.1 Pro (Highspeed)

Kimi K3

Kimi K3.1 Pro (Highspeed)

Both models delivered assembled and exploded projects that could be reopened. I prefer K3.1 Pro Highspeed's handheld, with clearer board traces, chips and fasteners that make the exploded view more interesting. K3 has a nice small touch too, with separate screws beside the rear shell.

What was checked

Both assembled and exploded Blender projects were reopened for verification.

NO. 06

Spot the differences

Compare the same images A and B, locate up to five differences and describe each change from A to B.

I lean toward Kimi K3

Kimi K3

Kimi K3.1 Pro (Highspeed)

For location coverage alone, I choose K3. It located all five differences, while K3.1 Pro Highspeed found four and missed the radio antenna. But checking the descriptions against images A and B shows that K3 reversed all five changes, scoring 0/5 for direction. All four changes reported by K3.1 Pro Highspeed had the correct direction, or 4/4. Coverage and description accuracy give different views of the same result.

What was checked

Location matches were 5/5 for K3 and 4/5 for K3.1 Pro Highspeed.

A separate check of change direction gave K3 0/5 and K3.1 Pro Highspeed 4/4.

K3.1 Pro Highspeed missed the disappearing antenna on top of the blue radio.

NO. 07

Five-storey pagoda

Build an orbitable five-storey pagoda scene in Three.js, including an arched bridge, pond, trees and lanterns.

I lean toward Kimi K3.1 Pro (Highspeed)

Kimi K3

Kimi K3.1 Pro (Highspeed)

I prefer K3.1 Pro Highspeed's pagoda, with individually visible roof tiles, more layered tree canopies and more natural falling petals. K3 chose a night scene and simplified the tower and trees considerably. An orbit in the same direction and at the same rate makes those differences easier to inspect.

What was checked

These three additional tasks came from separate runs with matching prompts and sync-v1 capture requirements.

NO. 08

Pelican on a bicycle · static

Draw a pelican riding a bicycle as a self-contained static SVG.

I lean toward Kimi K3.1 Pro (Highspeed)

Kimi K3

Kimi K3.1 Pro (Highspeed)

K3's pelican is not holding the handlebar, as if it is showing off hands-free riding. K3.1 Pro Highspeed at least reaches a wing towards the bar, and I prefer the overall result. One foot still overlaps the lines near the pedal awkwardly.

What was checked

The images are renders of the static SVG files delivered by the models.

NO. 09

Pelican on a bicycle · animated

Use SVG SMIL for a four-second loop with rotating wheels and crank, plus moving pedalling legs.

Overall close

Kimi K3

Kimi K3.1 Pro (Highspeed)

Neither animation impresses me much. The wings do not reach the handlebars, and the pedalling looks unnatural. In the synchronised first four seconds, K3 returns to its starting image at the four-second boundary, while K3.1 Pro Highspeed differs from its starting image at that point.

What was checked

Both SVGs were sampled over the first four seconds on the same absolute timeline.

At the four-second boundary, K3 matched its starting frame and K3.1 Pro Highspeed did not.

Round 2 · Tencent Hy4 vs K3.1 Pro Highspeed

Hy4 surprised me in places, especially on the image task and the washing-machine detail. I still prefer Kimi's web page and static pelican. The undelivered pagoda also remains part of this round.

Prefer Hy4

3 / 837.5%

Prefer Kimi

2 / 825%

Close overall

3 / 837.5%

Among the eight tasks with work from both models, I lean towards Hy4 on three, Kimi on two, and call three close. Hy4's pagoda is recorded as incomplete. The retro handheld took Hy4 30 minutes 57 seconds from start to delivery, compared with 5 minutes 34 seconds for Kimi Highspeed, including coding, tools, rendering and waiting. The routes differ, and these times describe those two complete runs.

NO. 01

Parametric bookshelf

Build a three-compartment Blender bookshelf, then change only its width from 800 to 1,000 mm.

Overall close

Tencent Hy4 (release)

Tencent Hy4 · 800 mm bookshelf, original model render

Tencent Hy4 · 1000 mm bookshelf, original model render

Kimi K3.1 Pro (Highspeed)

I see this one as close. With the two bookshelves side by side, neither has an obvious advantage for me. Their structure and overall finish are similar enough that this task does not give me a clear preference.

NO. 02

Underwater laundromat

Build an orbitable Web3D underwater laundromat with three rotating washing machines, jellyfish and fish.

I lean toward Tencent Hy4 (release)

Tencent Hy4 (release)

Tencent Hy4 · Underwater laundromat, original opening camera

Kimi K3.1 Pro (Highspeed)

K3.1 Pro original washer, stool and storage detail

The two scenes have a similar feel and are fairly close overall. I prefer Hy4's washing machines, whose drum doors and control panels look more like real appliances. Kimi K3.1 Pro Highspeed adds small everyday touches, including a stool and a table with folded clothes. I lean slightly towards Hy4 here.

What was checked

Both original laundromat scenes were captured in an isolated browser.

Unified camera capture did not pass verification for this task, so the images retain each work's original viewpoint.

NO. 03

Travel packing list

Build a Chinese packing list with add, check and delete controls, plus a mobile layout.

I lean toward Kimi K3.1 Pro (Highspeed)

Tencent Hy4 (release)

Tencent Hy4 · Travel packing list, initial page

Tencent Hy4 · Page after adding an umbrella, checking the charger and deleting the camera

Kimi K3.1 Pro (Highspeed)

I still prefer Kimi K3.1 Pro Highspeed's frontend styling and design. Hy4 delivered the list functionality, but its page feels more ordinary. With the same add, check and delete actions, Kimi's interface feels more finished to me.

What was checked

Both original apps passed adding an umbrella, checking the charger and deleting the camera.

NO. 04

Quarterly revenue chart

Draw proportional bars for quarterly revenue of 12, 24, 18 and 30, with a total of 84.

Overall close

Tencent Hy4 (release)

Tencent Hy4 · Quarterly revenue SVG chart

Kimi K3.1 Pro (Highspeed)

The two charts are broadly comparable. Hy4 uses stronger colour contrast, which I find a little easier to read. That is a colour preference, and I still group the overall result as close.

NO. 05

Exploded retro handheld

Create a retro handheld console and matching exploded view in Blender, with editable projects and two renders.

Overall close

Tencent Hy4 (release)

Tencent Hy4 · Assembled retro handheld, original render

Tencent Hy4 · Exploded retro handheld, original render

Kimi K3.1 Pro (Highspeed)

Neither handheld has a clear overall advantage for me, so I group them as close. If I had to pick one, I would lean a little towards K3.1 Pro Highspeed because its screen looks larger. That is mainly my preference for the proportions.

What was checked

Both assembled and exploded projects were reopened, with the main device components present in the exploded views.

NO. 06

Spot the differences

Compare the same images A and B, locate up to five differences and describe each change from A to B.

I lean toward Tencent Hy4 (release)

Tencent Hy4 (release)

Tencent Hy4 · Image A (left) and B (right), marked from the model answer

Kimi K3.1 Pro (Highspeed)

Hy4 located all five differences this time. Kimi K3.1 Pro Highspeed found four and missed the antenna disappearing from the radio. This was the biggest pleasant surprise of the round for me. On this image pair, Hy4 covered the changes more completely, so I choose it here.

What was checked

On the same image pair, location matches were 5/5 for Hy4 and 4/5 for Kimi K3.1 Pro Highspeed.

Neither model added extra valid boxes. Kimi missed the radio antenna.

NO. 07

Five-storey pagoda

Build an orbitable five-storey pagoda scene in Three.js, including an arched bridge, pond, trees and lanterns.

Incomplete delivery

Tencent Hy4 (release)

Hy4 returned a refusal in all three attempts at this task. The API supplied no specific explanation, and no completed scene was delivered.

Kimi K3.1 Pro (Highspeed)

Hy4 had three attempts at the same pagoda task. Each ended after the interface returned refusal, without a usable delivered scene. The right-hand image retains Kimi K3.1 Pro Highspeed's pagoda as a reference for the same task. Hy4 is recorded as incomplete here.

What was checked

The three separate attempts used identical original prompt bytes and the same sync-v1 specification.

All three final results recorded stop_reason as refusal, without delivered index.html or README.md files.

The logs do not identify the specific cause of the refusal.

NO. 08

Pelican on a bicycle · static

Draw a pelican riding a bicycle as a self-contained static SVG.

I lean toward Kimi K3.1 Pro (Highspeed)

Tencent Hy4 (release)

Tencent Hy4 · Static pelican bicycle SVG

Kimi K3.1 Pro (Highspeed)

Hy4's bicycle has attractive detail, but the wing reaching towards the handlebar appears to emerge from behind the neck. The foot, pedal and frame lines overlap awkwardly too. Kimi K3.1 Pro Highspeed also has overlapping lines near a foot, but I prefer its static image.

What was checked

The detail images are crops of each model's original SVG render.

NO. 09

Pelican on a bicycle · animated

Use SVG SMIL for a four-second loop with rotating wheels and crank, plus moving pedalling legs.

I lean toward Tencent Hy4 (release)

Tencent Hy4 (release)

Tencent Hy4 · Synchronized samples at 0, 1 and 2 seconds, left to right

Kimi K3.1 Pro (Highspeed)

In the animations, the legs and pedalling look unnatural in both versions. Hy4 at least draws the hands holding the handlebar, which makes the action easier to read. I lean towards it here, while the connection between the legs and pedals still needs work.

What was checked

The two animated SVGs were sampled at matching logical times over the first four seconds and are shown as still frames from matching times.

My overall take

Across these rounds, I care most about whether a model makes the particular work better. K3.1 Pro Highspeed's detail and frontend design suit my taste, while Hy4 covered this difference pair more completely and delivered washing-machine details I liked. Price and waiting time affect everyday use, so my choice balances the work I prefer, the flaws I can accept and my budget.

The counts summarise my saved preferences for these particular works. Difference locations and description direction are listed separately as checkable facts.

For price context, Tencent Cloud TokenHub's Guangzhou pay-as-you-go list on 7 November 2026 quotes RMB 6 input and RMB 18 output per million tokens for Hy4, and RMB 26 and RMB 136 for K3.1 Pro Highspeed. Hy4 has a 50% promotion there through 31 December 2026. The routes and actual billing used for these evaluations have their own terms.

Sources and evidence

Official Kimi K3.1 Pro release

Official Tencent Hy4 release

Tencent Cloud TokenHub pay-as-you-go pricing

Official Kimi API pricing

Bilingual report data · Image provenance and hashes

Earlier Kimi creative evaluation · Separate Hy4 visual and creative tests