{"slug": "tested-kimi-k3-for-coding-2026", "title": "Tested Kimi K3 for Coding (2026)", "summary": "Kimi K3, a new AI model released this week and claimed to be near-frontier quality similar to Fable and GPT, successfully optimized a Rust program by implementing a SWAR (SIMD Within a Register) optimization in about 15 minutes with no errors, achieving a 2% speedup at a cost of about $1 on OpenRouter.", "body_md": "The new model **Kimi K3** was released this week, and it is claimed to be **near-frontier** level quality similar to Fable and GPT. I decided to try it out and see if it could **optimize** my **Rust program**. I felt a less specific task, like \"optimize this function somehow\" was a good test.\n\nI set up Kimi K3 in **OpenCode**, and made a copy of my program directory so that I could throw away the changes made easily. I directed a prompt to the function I wanted optimized. I had spent a fair amount of time optimizing this function, and I did not seem to be making much progress on my own.\n\nKimi K3 had **2 recommendations**, and I decided to have it pursue the `SWAR`\n\noptimization—SIMD Within a Register. With `SWAR`\n\n, a single 64-bit value is treated as 8 eight-bit values—so we can handle 8 `u8`\n\nvalues (single-byte) at once.\n\nKimi K3 took about **15 minutes** for the task, and it completed it perfectly. I found the optimization sped up the program by 2%. So Kimi K3 both **decided** on an appropriate optimization, and **implemented** it with **no errors**—it seems to me that Kimi K3 could well be a frontier-level model as advertised. It cost about $1 for the tokens on OpenRouter.", "url": "https://wpnews.pro/news/tested-kimi-k3-for-coding-2026", "canonical_source": "https://www.dotnetperls.com/2026_7_18_tested-kimi-k3-coding", "published_at": "2026-07-20 14:01:33+00:00", "updated_at": "2026-07-20 14:26:19.377299+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-products", "ai-tools", "large-language-models"], "entities": ["Kimi K3", "OpenCode", "OpenRouter", "Fable", "GPT"], "alternates": {"html": "https://wpnews.pro/news/tested-kimi-k3-for-coding-2026", "markdown": "https://wpnews.pro/news/tested-kimi-k3-for-coding-2026.md", "text": "https://wpnews.pro/news/tested-kimi-k3-for-coding-2026.txt", "jsonld": "https://wpnews.pro/news/tested-kimi-k3-for-coding-2026.jsonld"}}