Claude Sonnet 5.5 vs Kimi K3.1 Pro
aka Sonnet 5.5 vs Moonshot AI Kimi K3.1 Pro
- Author picksClaude Sonnet 5.52–0
- FasterClaude Sonnet 5.51/1 postsmedian gap ~2.6×
As stated in each post, not a controlled benchmark.
Posts
5
Playable game, Kimi K3.1 Pro vs Claude Sonnet 5.5: Kimi K3.1 Pro, Claude Sonnet 5.5. Posted by @tamacoin_tamao.
Voxel canal boat ride, Sonnet vs Kimi K3.1 Pro: Claude Sonnet 5.5, Kimi K3.1 Pro. Posted by @filicroval.
Short Three.js animation from scratch, four models: Claude Sonnet 5.5, Gemini 4 Argon, Muse Spark 1.3, Kimi K3.1 Pro. Posted by @VulKan42069.
3D solar system, four models, one shot: Kimi K3.1 Pro, DeepSeek V4.1 Flash 1017, Claude Sonnet 5.5, Kimi K3. Posted by @nexightai.
Same prompt, separate runs
7Not a controlled comparison: prompts, tools and time differ.
About this matchup
Claude Sonnet 5.5 vs Kimi K3.1 Pro in real side-by-side tests: 5 posts from X where both got the same prompt; 1 post reports cost or time. Judge coding ability from the actual outputs.
Sonnet 5.5 vs Kimi K3.1 Pro: which is better for coding?
Which is better for coding, Sonnet 5.5 or Kimi K3.1 Pro?
Author picks: where the author preferred one of the two, they picked Claude Sonnet 5.5 twice and Kimi K3.1 Pro never. That covers 2 of the 5 posts here; each post is a different task, so watch the outputs above for the work you care about.
Which is faster, Sonnet 5.5 or Kimi K3.1 Pro?
1 post states a time for both: Claude Sonnet 5.5 was faster in it (~2.6× faster). Times are as stated in each post; tools and settings differ between posts.
What have Sonnet 5.5 and Kimi K3.1 Pro been tested on?
The most-viewed of the 5 posts: playable game, Kimi K3.1 Pro vs Claude Sonnet 5.5 (@tamacoin_tamao), 3D supercar, Terra vs Sonnet vs Sol vs Kimi (@marcthecreatorr), voxel canal boat ride, Sonnet vs Kimi K3.1 Pro (@filicroval). Categories: 3D & Shaders, Games.
Summary
Claude Sonnet 5.5 and Kimi K3.1 Pro appear together in 5 posts on X: 3D supercar, Terra vs Sonnet vs Sol vs Kimi (@marcthecreatorr), playable game, Kimi K3.1 Pro vs Claude Sonnet 5.5 (@tamacoin_tamao), voxel canal boat ride, Sonnet vs Kimi K3.1 Pro (@filicroval), short Three.js animation from scratch, four models (@VulKan42069) and 3D solar system, four models, one shot (@nexightai). 3 of them are part of larger lineups with other models. In @marcthecreatorr's 3D supercar, Terra vs Sonnet vs Sol vs Kimi, Claude Sonnet 5.5 was faster (29 min vs 1 h 15 min), as reported in the post.
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 |
|---|---|---|---|---|---|---|
| Claude Sonnet 5.5 | Anthropic | 2026-09-28 | $2 | $10 | 1,000,000 | 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
3- Voxel canal boat ride, Sonnet vs Kimi K3.1 ProThe poster thinks Claude Sonnet 5.5 won; Kimi K3.1 Pro got there after a few iterations and is not bad, but you cannot iterate your way into taste.— the author’s view, @filicroval (paraphrased)
- Short Three.js animation from scratch, four modelsThe poster ranks Claude Sonnet 5.5 first, then Gemini 4 Argon, Kimi K3.1 Pro and Muse Spark 1.3.— the author’s view, @VulKan42069 (paraphrased)
- 3D solar system, four models, one shotThe poster says Kimi K3.1 Pro built the most polished UI of the four and also cost the most.— the author’s view, @nexightai (paraphrased)
Models
Related matchups
Claude Opus 5.5 vs Claude Sonnet 5.560 posts · 445.7K viewsClaude Opus 5.5 vs Kimi K3.1 Pro52 posts · 316K viewsClaude Sonnet 5.5 vs GPT-6.1 Sol27 posts · 250.2K viewsGPT-6 Astra vs Kimi K3.1 Pro25 posts · 241.1K viewsClaude Sonnet 5.5 vs GPT-6.1 Terra21 posts · 39.6K viewsClaude Sonnet 5.5 vs GPT-6 Astra18 posts · 356.9K views