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Kimi K3 is a 2.8 trillion-parameter native multimodal open model with 1M-token…

2026-07-17 · 03:26 UTC ·@adxtyahq ·5 min read

Brief

Kimi K3, a 2.8T-parameter open multimodal model released as the first 3T-class open model, was pitted against GPT-5.6 Sol, Fable-5 and Grok 4.5 on three demanding procedural three.js generation tasks (roulette, slot machine, pinball) in a 2026 head-to-head on aimlapi. Kimi shines at deep reasoning: it derived a 480 Hz physics substep, handled ball-settle logic, produced the best pinball artwork, and avoided an importmap trap others missed. But Kimi is slow and brittle—75.6 minutes for the suite, failing the slot and pinball assembly (90° cabinet, floating legs, z-fights). Cost and token metrics favored Grok for speed and delivered lines; the test illustrates open-source models closing the gap on frontier systems but still trading reliability and throughput for richer internal reasoning.

Why it matters

Kimi K3 is a 2.8 trillion-parameter native multimodal open model with 1M-token context, a latent MoE that activates 16 of 896 experts, KDA attention and attention residuals, quantization-aware training (mxfp4 weights, mxfp8 activations), and claimed ~2.5x scaling efficiency over K2; pricing: $0.30/mtok cache-hit, $3.00/mtok cache-miss, $15.00/mtok output, and >90% cache-hit rate on coding workloads.

Key details

  • In a three-prompt procedural three.js benchmark run on aimlapi (photorealistic European roulette, Las Vegas slot machine, full 3D pinball), cost per run was Grok 4.5 $0.30, Kimi K3 $0.71, GPT-5.6 Sol $2.05, Fable-5 $7.69; Kimi produced 157,999 tokens, 2,255 lines, and took 75.6 minutes versus Grok's 34,241 tokens, 3,047 lines, and 5.1 minutes.
  • Kimi succeeded on the roulette with high-fidelity procedural wood grain and correct European sequence, produced the best pinball artwork and explicit physics reasoning (derived a 480 Hz substep, ball-settle conditions, termination guarantees), and was the only model to anticipate the three.js importmap trap.
  • Kimi failed two of three prompts: slot rendered reels backwards and used an old three.js build that ignored transmission, pinball assembled vertically at 90° with floating legs and z-fighting; 81% of Kimi's output tokens were reasoning (vs Grok 22%), making it slow and increasing wall-clock cost; price per 100 shipped lines: Grok $0.010, Kimi $0.031, Sol $0.067, Fable $0.394.
Source evidence

IF YOU STILL THINK THE BEST AI WILL ALWAYS COME FROM CLOSED LABS, YOU HAVEN'T BEEN PAYING ATTENTION

Kimi K3 just went head-to-head with GPT-5.6, Opus 4.8, Fable-5 and Grok 4.5 on procedural 3D game generation while costing a fraction of what most frontier models charge

Cost per run:
• Grok 4.5 - $0.30
• Kimi K3 - $0.71
• GPT-5.6 - $2.05
• Fable-5 - $7.69

They tested all four models on the same prompts:
• Photorealistic European Roulette
• Las Vegas Slot Machine
• Full 3D Pinball Table

The CRAZY part wasn't the benchmark scores, it was watching Kimi solve problems that the other models DIDN'T EVEN SEE COMING

Open-source AI is catching up to frontier models much faster than anyone expected, and that's quickly becoming the new normal

Video

thehype. (@thehypedotnews)

kimi k3 vs gpt 5.6 sol vs fable 5 vs grok 4.5

@Kimi_Moonshot just dropped kimi k3 – a 2.8t param native multimodal model, the first open 3t-class release. key facts:

• 1m token context. stable latentmoe activating 16 of 896 experts, built on kimi delta attention (kda) and attention residuals

• quantization-aware training from the sft stage onward – mxfp4 weights, mxfp8 activations. moonshot claims ~2.5x scaling efficiency over k2

• max thinking effort by default. low- and high-effort modes are "coming in updates" – there is no way to turn the thinking down today, and you feel it in every run

• pricing: $0.30/mtok cache-hit input, $3.00/mtok cache-miss, $15.00/mtok output. claims >90% cache hit rate on coding workloads

• benchmarks: swe marathon 42.0 (1st – fable 5: 35.0, sol: 39.0, opus 4.8: 40.0), terminal bench 2.1 88.3, browsecomp 91.2 (1st), program bench 77.8 (1st), gpqa-diamond 93.5. loses frontierswe 81.2 vs fable's 86.6, and deepswe 67.5 vs sol's 73.0

our test – 3 prompts, single-file html, @threejs, fully procedural, no assets:

  1. photorealistic european roulette wheel – 37 pockets in the real sequence, mahogany clearcoat bowl, chrome turret, diamond deflectors, flick-to-spin, ball that spirals inward and settles on a mathematically real number

  2. las vegas slot machine – 3 reels behind transmissive glass, drag the chrome lever to play, mechanical odometer counters modelled in 3d, coin physics on win

  3. full pinball table – 6.5° tilted playfield, flipper impulse physics, spline ramps, drop targets, 6 bumpers, mechanical score reels in the backbox

we ran the test on @aimlapi platform

results:

  • cost

    1 grok 4.5 – $0.30

2 kimi k3 – $0.71

3 gpt 5.6 sol – $2.05

4 fable 5 – $7.69

  • tokens

    1 grok 4.5 – 34,241

2 gpt 5.6 sol – 51,748

3 fable 5 – 144,126

4 kimi k3 – 157,999

  • lines of code

    1 gpt 5.6 sol – 3,054

2 grok 4.5 – 3,047

3 kimi k3 – 2,255

4 fable 5 – 1,950

  • generation time

    1 grok 4.5 – 5.1 min

2 gpt 5.6 sol – 22.0 min

3 fable 5 – 31.5 min

4 kimi k3 – 75.6 min

observations:

• kimi k3 is cheap and it is slow. 75.6 minutes across three prompts against grok's 5.1. it is 2.4x grok's price and 15x grok's wall clock. the roulette took 15 min, the slot 18, the pinball 42

• it failed 2 of 3. only the roulette works. the slot machine has reel cutouts on both faces of the cabinet and the symbols face backwards – you can only read your spin by walking around to the rear of the machine. the pinball table stands vertically on its edge with the legs floating detached beside it.

• 81% of kimi's output tokens are reasoning, not code. grok: 22%. you are not paying for a bigger answer, you are paying for a longer argument with itself

• price per 100 shipped lines – grok $0.010, kimi $0.031, sol $0.067, fable $0.394. a 39x spread for the same three files

kimi k3's code quality:

upsides:

• the roulette is genuinely good – procedural wood grain with real specular breakup, correct european sequence (0-32-15-19-4...), chrome turret, diamond deflectors, clean console

• the pinball artwork is the best in the test – a synthwave "nova strike / deep space" field with six individually coloured neon bumper rings, a retro sun on a grid horizon, a nova burst, and a scoring legend printed on the apron. no other model printed the rules on the machine. it is a beautiful texture on a broken object

• physics reasoning is real – it derived a 480hz substep for the collider, worked out ball settle conditions and termination guarantees, and checked every ramp exit vector by hand before writing any of it

• it is the only model that saw the importmap trap coming. sol shipped a blank white page twice because three.js addons import the bare specifier 'three' and die without an import map

downsides:

• it dodged that trap on the slot by loading three.js r128 through classic script tags – a 2021 build with no working transmission. its slot glass rendered fully opaque and buried all three reels behind a white pane. the code asks for transmission: 0.93, ior: 1.5 – correct, and silently ignored by a renderer that predates the feature

• after 42 minutes and 212k characters of reasoning, the pinball cabinet is not assembled. the table stands vertically on its edge like a wardrobe – the prompt asked for 6.5° from horizontal, it delivered 90°. the legs float detached in the void beside it. head-on it photographs beautifully; orbit ten degrees and it is a painted slab with four chrome rods hovering nearby

• the playfield z-fights with the glass – hard black banding across the whole field as soon as you pull the camera back

a note on the pinball, in fairness to kimi: nobody passed it. every model shipped broken ball physics and controls you cannot trust. it is the hardest prompt we have run and the whole field failed it, each in its own way

kimi k3 reasons better than anything else here and it shows exactly where reasoning pays – physics constants, sequences, edge cases, traps the others walked into

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Video

— https://nitter.net/thehypedotnews/status/2077924746415518033#m