GPT-5.6 Luna vs. GPT-6 Astra: Is a $1.20 Model Good Enough for Code Review?

A comparison between GPT-5.6 Luna and GPT-6 Astra for code review shows significant cost differences and varying bug detection rates. Luna, priced at $1.20 per million output tokens, cost $0.0041 per review and found 69 verified bugs. Astra, at $50 per million output tokens, cost $0.113 per review and found 92 verified bugs. While Luna was wrong more often (24 of 93 findings failed verification vs. Astra's 4 of 96), its lower cost makes it a viable option, especially for budget-conscious applications.