{"slug": "claude-haiku-versus-gpt-luna", "title": "Claude Haiku Versus GPT-Luna", "summary": "A blogger's comparison of Claude Haiku 5.5 and GPT-6-Luna on OpenRouter for Rust code generation found both models typically cost under $0.01 per generation (often as low as $0.005) and respond in 10-30 seconds, with code usually working on the first attempt. The author reports Claude Haiku tends to generate separate functions while GPT-6-Luna puts more logic in a single function, and recommends trying these cheaper models first and only falling back to more expensive models like Opus or Sol when the output is incorrect.", "body_md": "As regular readers of this blog will know, I have been using **Claude Haiku 5.5** and **GPT-6-Luna** on **OpenRouter** to generate **Rust code**. Most of the time, code generation costs less than $0.01 (often as low as $0.005) with both of these models, so they are economical assuming you use them only a few times a day.\n\nBoth models also seem to respond with the generated content in **10-30 seconds**, so they are very similar overall. I have noticed Claude Haiku has a little **different style** of Rust code it generates—it tends to prefer separate functions, while GPT-6-Luna puts more things in a single function.\n\nAs far as functionality goes, the **code usually works** on my **first attempt** in both models. Sometimes Haiku or Luna will write code that does not fit my needs correctly. Usually a more advanced model like Opus or Sol will generate correct code in these cases.\n\nSo the **comparison** results: both of these \"cheap\" models occasionally make **mistakes**, but they are often **good enough**, and if one fails, try the other. As far as when to use Haiku and Luna—I would recommend using them **first** on all code generation, and only if the result is incorrect, using a more expensive model.", "url": "https://wpnews.pro/news/claude-haiku-versus-gpt-luna", "canonical_source": "https://www.dotnetperls.com/2026_10_11_claude-haiku-versus-gpt-6-luna", "published_at": "2026-10-11 07:00:00+00:00", "updated_at": "2026-10-11 12:53:56.888705+00:00", "lang": "en", "topics": ["large-language-models", "ai-tools", "generative-ai", "developer-tools"], "entities": ["Claude Haiku 5.5", "GPT-6-Luna", "OpenRouter", "Rust", "Opus", "Sol"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/claude-haiku-versus-gpt-luna", "markdown": "https://wpnews.pro/news/claude-haiku-versus-gpt-luna.md", "text": "https://wpnews.pro/news/claude-haiku-versus-gpt-luna.txt", "jsonld": "https://wpnews.pro/news/claude-haiku-versus-gpt-luna.jsonld"}}