{"slug": "ask-hn-how-do-you-know-a-prompt-is-complex-for-an-ai-model", "title": "Ask HN: How do you know a prompt is \"complex\" for an AI model?", "summary": "A Hacker News user asked how to determine when a prompt is complex enough to require a frontier AI model, citing concerns about API costs and latency. The user currently defaults to Claude Sonnet for reliability but believes smaller models like Haiku or lite open-source models could handle simpler tasks, potentially reducing expenses.", "body_md": "| [Guidelines](newsguidelines.html) \\|[FAQ](newsfaq.html) \\|[Lists](lists) \\|[API](https://github.com/HackerNews/API) \\|[Security](security.html) \\|[Legal](https://www.ycombinator.com/legal/) \\|[Apply to YC](https://www.ycombinator.com/apply/) \\|[Contact](mailto:hn@ycombinator.com) | \n\n|  | **[Hacker News](news)**[new](newest) \\|[past](front) \\|[comments](newcomments) \\|[ask](ask) \\|[show](show) \\|[jobs](jobs) \\|[submit](submit) | [login](login?goto=item%3Fid%3D49601670) | \n\n|  |  | [Ask HN: How do you know a prompt is \"complex\" for an AI model?](item?id=49601670) | \n|  |  | 1 point by [faryadz](user?id=faryadz)[36 minutes ago](item?id=49601670) \\|[hide](hide?id=49601670&goto=item%3Fid%3D49601670) \\|[past](https://hn.algolia.com/?query=Ask%20HN%3A%20How%20do%20you%20know%20a%20prompt%20is%20%22complex%22%20for%20an%20AI%20model%3F&type=story&dateRange=all&sort=byDate&storyText=false&prefix&page=0) \\|[favorite](fave?id=49601670&auth=f89bcca1daa013453a7e5fcca0443073d0754970) \\|[discuss](item?id=49601670) | \n|  |  | I’m trying to balance API costs and latency in my applications. Right now, I default to frontier models (Claude Sonnet) because they are reliable, but I know I’m overpaying for tasks that smaller models (like Haiku, or lite open source models) could likely handle. |", "url": "https://wpnews.pro/news/ask-hn-how-do-you-know-a-prompt-is-complex-for-an-ai-model", "canonical_source": "https://news.ycombinator.com/item?id=49601670", "published_at": "2026-09-07 18:54:08+00:00", "updated_at": "2026-09-07 19:32:11.572316+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-products", "ai-infrastructure"], "entities": ["Hacker News", "Claude Sonnet", "Haiku"], "alternates": {"html": "https://wpnews.pro/news/ask-hn-how-do-you-know-a-prompt-is-complex-for-an-ai-model", "markdown": "https://wpnews.pro/news/ask-hn-how-do-you-know-a-prompt-is-complex-for-an-ai-model.md", "text": "https://wpnews.pro/news/ask-hn-how-do-you-know-a-prompt-is-complex-for-an-ai-model.txt", "jsonld": "https://wpnews.pro/news/ask-hn-how-do-you-know-a-prompt-is-complex-for-an-ai-model.jsonld"}}