Claude Opus 5.5 vs Kimi K3.1 Pro
Same prompt: a rooftop glass pool at sunset, built from scratch in code.
- Opus 5.5: 26 min, ~$12.35
- Kimi K3.1 Pro: 19 min, ~$0.63
Kimi was 20x cheaper and nailed the night lighting. Opus on the other hand looks detailed.
Which one would you pick?
Kimi K3.1 Pro beats GPT-6 Astra and Fable 5.1 on Terminal-Bench 4.0.
But how good is it at actual coding?
So I gave it the frontend test I run on every major model release, this time using Kimi Code:
One prompt + one reference image.
The task: rebuild a 3D globe dashboard. 🌎
Two things stood out:
1. Day/night mode toggle. The reference image shows this toggle, but my prompt never mentions it. K3.1 Pro spotted it and built it anyway.
2. 2D/3D view switching. It built both views, including a working 2D mode.
The Three.js globe also looks close to the reference. In night mode, city lights appear and disappear naturally as the globe rotates.
K3.1 Pro reads the reference image like a senior frontend dev reading a design spec. It catches details beyond the written instructions.
From this test, I'd put K3.1 Pro on par with GPT-6 Astra and Opus 5.5 for frontend and visuals. On a few small details, I liked Kimi's version better.
Introducing Kimi K3.1 Pro: our most capable 3T-class open-weight model.
🔹 1M-token context, 2.8T total / 104B active params (MoE), Multimodal.
🔹 Full-project coding: games in Unreal, Unity & Godot.
🔹 Excels at parametric 3D modeling in Blender & CAD.
🔹 More reliable at
Kimi K3.1 vs GPT-6 Astra (3D cutaway house)
Same prompt: build an interactive 3D cutaway house in one HTML file.
> Kimi (high): 15 mins~ $1.7
> Astra (extra high): 30 min~ $6
Is Astra’s output worth 4x the price here?
Kimi K3.1 Pro launches at 4th on the Artificial Analysis Intelligence Index scoring 55, making large gains in agentic performance; it will be the leading open-weights model once its weights are published
@Kimi_Moonshot's new reasoning model gains 11 points over Kimi K3 (max,
china has caught up again
moonshot announced their new model k3.1 pro and it matches astra and fable performance at fraction of the cost
openai and anthropic were relaxed while china was far behind, but this is just the start
next up are qwen and glm models, which i'm sure will do way better
pressure on openai and anthropic has increased but way more on anthropic as they have ipo coming up next month and now model from china has taken fable's place
i expect response from both openai and anthropic in about 2 weeks. things are about to get interesting
kimi team just announced a new SOTA model
k3.1 pro is now live and i've been testing it for the last few days. thanks team for access
here are some tests i ran and model cooked
first one, 3d ship test and model one-shotted this in about an hour and cost $8.4
TLDR on the kimi k3.1 pro benchmarks is that it looks like they figured out their RL, where the initial release was a very impressive base model with lighter post-training. China is very much keeping pace with capability gains.
okay, wow.
kimi k3.1 pro beats opus 5.5 on 9/14 benchmarks and gpt-6 astra on 10/14 and even on SWE Marathon kimi scores 51.7 vs 46.3 for opus and 42.5 for astra
didn't expect kimi to be competing this closely with frontier models
Introducing Kimi K3.1 Pro: our most capable 3T-class open-weight model.
🔹 1M-token context, 2.8T total / 104B active params (MoE), Multimodal.
🔹 Full-project coding: games in Unreal, Unity & Godot.
🔹 Excels at parametric 3D modeling in Blender & CAD.
🔹 More reliable at
Introducing Kimi K3.1 Pro: our most capable 3T-class open-weight model.
🔹 1M-token context, 2.8T total / 104B active params (MoE), Multimodal.
🔹 Full-project coding: games in Unreal, Unity & Godot.
🔹 Excels at parametric 3D modeling in Blender & CAD.
🔹 More reliable at
This is INSANE.
Kimi K3.1 is here, and we finally have an open-source model competing at Opus 5.5 , Fable 5.1 and GPT 6 Astra
Open weights expected by November 4, 2026.
Introducing Kimi K3.1 Pro: our most capable 3T-class open-weight model.
🔹 1M-token context, 2.8T total / 104B active params (MoE), Multimodal.
🔹 Full-project coding: games in Unreal, Unity & Godot.
🔹 Excels at parametric 3D modeling in Blender & CAD.
🔹 More reliable at
Kimi k3.1 + Anatomy skill.
Direct-drive tube turntable, exploded in pure isometric SVG.
Zero external assets just geometry, four-tone shading, and painter's order.
Kimi K3.1 Pro vs GPT-6 Astra 👀
Both are building impressive 3D scenes, but the lighting, ocean details, and overall atmosphere make this comparison interesting
AI models are getting seriously good at turning prompts into interactive worlds
Kimi k3.1 vs Opus 5.5
I compared these two models and how these models can create a Black Hole
Creation time:
Kimi k3.1 - 30 minutes
Opus 5.5 - 48 minutes
which model did it better?
91 Followers 723 FollowingCoding wizard by day, machine learning explorer by night | Turning ideas into code and curiosity into breakthroughs | Join the journey!
575K Followers 746 FollowingWelcome to the new way to cloud.
Qs? ➡️ https://t.co/BFKBu3t6xk
For do-ers & makers ➡️ @GoogleCloudTech
Watch the #GeminiAtWork replay ⬇️
242K Followers 50 FollowingIndependent reporting and analysis on AI, startups, space, and frontier technology. Sign up for the newsletter: https://t.co/H7BvEdiwmT.
22K Followers 962 FollowingThe creative AI engine studios actually use in production, at scale. Build custom pipelines & workflows across Images · Video · 3D · Audio. Your brand, your AI.
169K Followers 1 FollowingDiscover what’s going on in the Kotlin ecosystem | @JetBrains
Video tutorials https://t.co/u8SefOyX4B
News https://t.co/pvEUEI0iPX
Community discussions https://t.co/f1ymehGEIq
23K Followers 6 FollowingThis is the official account for @Alibaba_Qwen Developers. Let's build!
Apply to be a Qwen Ambassador here: https://t.co/unvFq4oCRY
62K Followers 10K FollowingClimate and clean energy investor. Author of 5 books. Energy & Environment co-chair @SingularityU. Trying to build a better world.
12K Followers 3K FollowingPersonal Agent Dev · Economics·AI Engineer
@cognition Ambassador
Specializing in how AI can be applied to life
📮[email protected]
604K Followers 75 Following@AMD Ryzen processors enable digital creators, VR pioneers, game world explorers and tech thrill-seekers.
Need support? Visit our forum: https://t.co/a10nee7eVt
109K Followers 0 FollowingThe official home of Google's Gemma. Lightweight, state-of-the-art open models by Google DeepMind, built on Gemini tech. What will you build? 🚀💻
591K Followers 57 FollowingThe official account of Microsoft Customer Service & Support; YouTube: https://t.co/c3H7DRI9rL│Support community: https://t.co/iJ33w2eGkt
425K Followers 130 FollowingThe official Chrome Devs X account from Google. We want to help you build beautiful, accessible, fast, & secure websites that work for everyone, everywhere.