{"slug": "used-glm-5-3-flash-for-code", "title": "Used GLM 5.3 Flash for Code", "summary": "A developer used OpenRouter to run GLM 5.3 Flash on two Rust functions generated from written specs, paying about $0.03 total for the work. The developer reported the model coded the functions well, worked quickly, and produced optimizations better than the original versions, concluding that generating code from a handful of specs via chat on OpenRouter is cost-efficient even with models like GPT-6-Sol.", "body_md": "Yesterday I wrote 2 more **specs** for my program, and needed a LLM to **generate** the **code**. I used OpenRouter and decided to try out **GLM 5.3 Flash**. My total bill for the endeavor came out to about 3 cents ($0.03).\n\nAfter using GLM 5.3 Flash I can see why some people want to buy expensive computers and run it locally all day—it is a **nice model**. It coded the functions well, and worked quickly. Both of the Rust functions were **optimized** in ways better than the original versions.\n\nSome notes on spec-driven development:\n\n• There is a \"complexity level\" that is ideal.\n\n• Writing a complete spec for a simple function is kind of a waste of time; and code that is too complex also needs more than a single specification.\n\n• Using a handful of specs and generating code for them via chat on OpenRouter is surprisingly cost-efficient, even with models like GPT-6-Sol.", "url": "https://wpnews.pro/news/used-glm-5-3-flash-for-code", "canonical_source": "https://www.dotnetperls.com/2026_9_24_used-glm-53-flash-code", "published_at": "2026-09-24 07:00:00+00:00", "updated_at": "2026-09-24 15:02:09.484378+00:00", "lang": "en", "topics": ["large-language-models", "ai-tools", "generative-ai", "developer-tools"], "entities": ["GLM 5.3 Flash", "OpenRouter", "GPT-6-Sol", "Rust"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/used-glm-5-3-flash-for-code", "markdown": "https://wpnews.pro/news/used-glm-5-3-flash-for-code.md", "text": "https://wpnews.pro/news/used-glm-5-3-flash-for-code.txt", "jsonld": "https://wpnews.pro/news/used-glm-5-3-flash-for-code.jsonld"}}