{"version":1,"type":"story","url":"https://digestai.news/story/gpt-5-6-luna-vs-gpt-6-astra-is-1-20-model-good-enough","json":"https://digestai.news/story/gpt-5-6-luna-vs-gpt-6-astra-is-1-20-model-good-enough.json","markdown":"https://digestai.news/story/gpt-5-6-luna-vs-gpt-6-astra-is-1-20-model-good-enough.md","slug":"gpt-5-6-luna-vs-gpt-6-astra-is-1-20-model-good-enough","headline":"GPT-5.6 Luna vs GPT-6 Astra: Is $1.20 Model Good Enough?","summary":"The article compares the cost and effectiveness of two AI models, GPT-5.6 Luna and GPT-6 Astra, in code review tasks. While Astra is more expensive at $10 per million input tokens and output tokens, it finds significantly more bugs (92 vs 69) across 50 pull requests. Luna costs only $0.20 for the same amount of work but misses more bugs (24 vs 4). The article highlights that Astra is better at identifying security bugs, while Luna performs well on correctness and concurrency issues. Despite these differences, both models cost around $5.86 per run, which is a significant portion of their combined output price. The study also notes the importance of context in AI model performance and suggests running multiple runs to catch all potential bugs.","keyPoints":["GPT-5.6 Luna costs $0.20 per million tokens for input and output","GPT-6 Astra costs $10 per million tokens for input and output","Luna finds 69 verified bugs, while Astra finds 92"],"whyItMatters":"This comparison is crucial for companies considering which AI model to use in their code review processes. It highlights the trade-offs between cost and effectiveness, especially as models like GPT-6 Astra become more expensive.","category":{"slug":"models","name":"Generative AI & Models","url":"https://digestai.news/category/models"},"entities":{"companies":["GPT-5.6 Luna","GPT-6 Astra"],"models":["GPT-5.6 Luna","GPT-6 Astra"],"people":[]},"firstPublishedAt":"2026-09-09T00:00:00Z","updatedAt":"2026-09-09T00:00:00Z","sourceCount":1,"hasPrimarySource":false,"sources":[{"outlet":"entelligence.ai","title":"GPT-5.6 Luna vs. GPT-6 Astra: Is a $1.20 Model Good Enough for Code Review?","url":"https://entelligence.ai/blogs/gpt-5.6-luna-vs-gpt-6-astra-is-a-1.20-model-good-enough-for-code-review","publishedAt":"2026-09-09T00:00:00Z","type":"press","primary":false,"lead":true}],"sourceNotes":null,"discussions":[{"site":"Hacker News","url":"https://news.ycombinator.com/item?id=49703003","points":55}],"thread":{"title":"OpenAI Unveils GPT-6 Astra Amid Controversy","url":"https://digestai.news/thread/openais-gpt6-astra-faces-postlaunch-quality-drop-claims","storyCount":5},"cite":{"text":"Digest AI, \"GPT-5.6 Luna vs GPT-6 Astra: Is $1.20 Model Good Enough?\", 9 September 2026, https://digestai.news/story/gpt-5-6-luna-vs-gpt-6-astra-is-1-20-model-good-enough","publisher":"Digest AI","title":"GPT-5.6 Luna vs GPT-6 Astra: Is $1.20 Model Good Enough?","datePublished":"2026-09-09T00:00:00Z","url":"https://digestai.news/story/gpt-5-6-luna-vs-gpt-6-astra-is-1-20-model-good-enough"},"generatedBy":"Written by Digest AI's editorial model from the linked sources; the sources are the record.","license":"Headlines, digests and key points are written by Digest AI and may be quoted with a link to the story page. Linked articles belong to their publishers. Terms: https://digestai.news/terms#reuse"}