GPT-6 Astra vs Kimi K3.1 Pro
aka Astra vs Moonshot AI Kimi K3.1 Pro
- Author picksEven4–4
- CheaperKimi K3.1 Pro11/11 postsmedian gap ~5.8×
- FasterGPT-6 Astra4/7 postsmedian gap ~1.6×
As stated in each post, not a controlled benchmark.
Posts
25
Chip rack in a soap bubble, three models: Claude Opus 5.5, GPT-6 Astra, Kimi K3.1 Pro. Posted by @kairox36.
Erupting 3D volcano, Kimi K3.1 Pro and 3 others: Kimi K3.1 Pro, GPT-6 Astra, DeepSeek V4.1 Flash 1017, GLM 5.3 Flash. Posted by @criscxuan.
Six-legged robot model: Kimi K3.1 Pro, GPT-6 Astra. Posted by @0x_fokki.
Ghost ship hull repair, $0.44 vs $5.65: Kimi K3.1 Pro, GPT-6 Astra. Posted by @manmanloveai.
Sandworm model, Kimi vs Astra: Kimi K3.1 Pro, GPT-6 Astra. Posted by @elvar_official.
3D bee model, Kimi vs Astra: Kimi K3.1 Pro, GPT-6 Astra. Posted by @Nyxera0x.
Steam locomotive SVG animation: Kimi K3.1 Pro, GPT-6 Astra, Claude Opus 5.5. Posted by @MakeAI_CEO.
Complex procedural 3D scene in Three.js: Kimi K3.1 Pro, GPT-6 Astra. Posted by @mylifcc.
Rainy train station in 3D: Kimi K3.1 Pro, GPT-6 Astra. Posted by @haolv511482.
Soft-body gummy eyeball in Three.js: GPT-6 Astra, Kimi K3.1 Pro, Claude Opus 5.5. Posted by @daveeyyy_.
Personal site cover, same harness: Kimi K3.1 Pro, GPT-6 Astra, Claude Opus 5.5. Posted by @jackyang.
Motion design at highest reasoning, $86.50 vs $7.30: GPT-6 Astra, Kimi K3.1 Pro. Posted by @notjazii.
3D gamepad model with exploded view: Kimi K3.1 Pro, GPT-6 Astra. Posted by @leo114119.
12-step Rube Goldberg machine in 30 seconds: GPT-6 Astra, Kimi K3.1 Pro. Posted by @adolandev.
Pixel airport scene, $0.98 vs $17.61: Kimi K3.1 Pro, GPT-6 Astra. Posted by @vib3coded.
3D pinball machine, first round: Kimi K3.1 Pro, GPT-6 Astra. Posted by @leppppp1.
Holographic CD spinning on its edge until it falls: Kimi K3.1 Pro, GPT-6 Astra, Claude Opus 5.5, Gemini 4 Argon. Posted by @Terry_Djony.
Rocket launch simulator in one HTML file: Claude Opus 5.5, Kimi K3.1 Pro, GPT-6 Astra. Posted by @asklogai.
28-second dragon flight in six shots: Kimi K3.1 Pro, GPT-6 Astra. Posted by @kartikktwt.
Pelican learns to ride a bike with RL: GPT-6 Astra, Kimi K3.1 Pro. Posted by @YifeiZhou.
Full browser Minecraft, $2.30 vs $13.40: Kimi K3.1 Pro, GPT-6 Astra. Posted by @starmexxx.
Animated 3D tabletop railway: Kimi K3.1 Pro, GPT-6 Astra. Posted by @Amank1412.
White House 3D website from the same images: Kimi K3.1 Pro, GPT-6 Astra. Posted by @MaxForAI.
Single-file Three.js test, three frontier models: Kimi K3.1 Pro, Claude Opus 5.5, GPT-6 Astra. Posted by @AI_Screening.
Same prompt, separate runs
9Not a controlled comparison: prompts, tools and time differ.
About this matchup
GPT-6 Astra vs Kimi K3.1 Pro in real side-by-side tests: 25 posts from X where both got the same prompt; 13 posts report cost or time. Judge coding ability from the actual outputs.
GPT-6 Astra vs Kimi K3.1 Pro: which is better for coding?
Which is better for coding, GPT-6 Astra or Kimi K3.1 Pro?
Author picks: where the author preferred one of the two, they picked GPT-6 Astra 4 times and Kimi K3.1 Pro 4 times. That covers 8 of the 25 posts here; each post is a different task, so watch the outputs above for the work you care about.
Which is cheaper, GPT-6 Astra or Kimi K3.1 Pro?
11 posts state a cost for both: Kimi K3.1 Pro was cheaper in all 11 (median gap ~5.8×). These are the costs the posts state for each run, not list prices.
Which is faster, GPT-6 Astra or Kimi K3.1 Pro?
7 posts state a time for both: GPT-6 Astra was faster in 4; Kimi K3.1 Pro in 3 (median gap ~1.6×). Times are as stated in each post; tools and settings differ between posts.
Summary
GPT-6 Astra and Kimi K3.1 Pro appear together in 25 posts on X: 3D bird guide page, GPT-6 Astra vs Kimi K3.1 Pro (@EvoLinkAi), chip rack in a soap bubble, three models (@kairox36), erupting 3D volcano, Kimi K3.1 Pro and 3 others (@criscxuan), six-legged robot model (@0x_fokki), ghost ship hull repair, $0.44 vs $5.65 (@manmanloveai) and 20 more. 8 of them are part of larger lineups with other models. The 5 most-viewed examples: In @notjazii's motion design at highest reasoning, $86.50 vs $7.30, Kimi K3.1 Pro was cheaper ($7.30 vs $86.50) and faster (45 min vs 47 min), as reported in the post. In @vib3coded's pixel airport scene, $0.98 vs $17.61, Kimi K3.1 Pro was cheaper ($0.98 vs $17.61), as reported in the post. In @MakeAI_CEO's steam locomotive SVG animation, Kimi K3.1 Pro was cheaper ($1.34 vs $6.19), as reported in the post. In @Amank1412's animated 3D tabletop railway, Kimi K3.1 Pro was cheaper ($6.20 vs $16.40) and faster (18 min vs 29 min), as reported in the post. In @starmexxx's full browser Minecraft, $2.30 vs $13.40, Kimi K3.1 Pro was cheaper ($2.30 vs $13.40), as reported in the post. The table below lists all 13 posts with numbers for both.
What each post reports
Only numbers stated in each post. “—” means the post doesn’t say.
Quick facts
| Model | Vendor | Released | Input $/1M tokens | Output $/1M tokens | Context (tokens) | Official links |
|---|---|---|---|---|---|---|
| GPT-6 Astra | OpenAI | 2026-09-03 | $10 | $50 | 1,050,000 | Model docs |
| Kimi K3.1 Pro | Moonshot AI | 2026-10-23 | 1,000,000 | Tech blog · Announcement |
From the vendors’ official pages, checked 2026-10-24. Standard API list prices; each value links its source and a blank cell could not be verified. The archive’s own numbers above are what each post states.
Who won where
12- Erupting 3D volcano, Kimi K3.1 Pro and 3 othersThe poster says Kimi K3.1 Pro has great detail and a big jump in 3D modeling, better than Astra Max.— the author’s view, @criscxuan (paraphrased)
- Six-legged robot modelThe poster says Kimi K3.1 Pro made a rounded shell with an inset lid, while GPT-6 Astra stacked a hexagonal slab on six boxy legs.— the author’s view, @0x_fokki (paraphrased)
- Sandworm model, Kimi vs AstraThe poster says Kimi K3.1 Pro covered every ring in panels and ran a gold band around the mouth, and prefers its result.— the author’s view, @elvar_official (paraphrased)
- 3D bee model, Kimi vs AstraThe poster says Kimi K3.1 Pro added hair on every leg and a faceted eye, while GPT-6 Astra built a smooth green plastic bee.— the author’s view, @Nyxera0x (paraphrased)
- Rainy train station in 3DThe poster says GPT-6 Astra produced a more polished scene with fewer bugs.— the author’s view, @haolv511482 (paraphrased)
- Personal site cover, same harnessThe poster picks Claude Opus 5.5; Kimi K3.1 Pro is good but plays it safe, and GPT-6 Astra is good but too abstract.— the author’s view, @jackyang (paraphrased)
- Motion design at highest reasoning, $86.50 vs $7.30The poster says GPT-6 Astra is getting outdone by Kimi K3.1 Pro here, and leaves the final call to viewers.— the author’s view, @notjazii (paraphrased)
- 3D gamepad model with exploded viewThe poster says Kimi falls short: the 3D feel is fake and the buttons are off, while Astra looks more real with better button interaction.— the author’s view, @leo114119 (paraphrased)
- Pixel airport scene, $0.98 vs $17.61For value the poster picks Kimi K3.1 Pro, saying it holds its own next to Astra at almost 18 times less.— the author’s view, @vib3coded (paraphrased)
- Pelican learns to ride a bike with RLBy the poster’s own eval, GPT-6 Astra scored 98/100 and Kimi K3.1 Pro 29/100.— the author’s view, @YifeiZhou (paraphrased)
- White House 3D website from the same imagesThe poster says GPT-6 Astra is clearly better, while calling Kimi K3.1 Pro the open-source state of the art.— the author’s view, @MaxForAI (paraphrased)
- Single-file Three.js test, three frontier modelsThe poster says Kimi K3.1 Pro beat GPT-6 Astra and is now competing at the frontier.— the author’s view, @AI_Screening (paraphrased)
Prompts shown in the posts
Build a complex procedural 3D scene in Three.js. — @mylifcc
A holographic CD spinning on its edge until it falls — @Terry_Djony
Models
Related matchups
Claude Opus 5.5 vs GPT-6 Astra172 posts · 1.3M viewsClaude Opus 5.5 vs Kimi K3.1 Pro52 posts · 316K viewsGemini 4 Argon vs GPT-6 Astra47 posts · 485.2K viewsGPT-6 Astra vs GPT-6.1 Sol26 posts · 171.6K viewsDeepSeek V4.1 Flash 1017 vs GPT-6 Astra22 posts · 112.9K viewsClaude Sonnet 5.5 vs GPT-6 Astra18 posts · 356.9K views