GPT-5.6 Luna vs GPT-6 Astra for Code Review

In a 50-PR comparison, GPT-5.6 Luna found 69 verified bugs while GPT-6 Astra found 92; Luna run cost $0.20 versus Astra $5.66. Luna is much cheaper and handles routine correctness bugs well but has more false findings and finds fewer security issues, so it shouldn’t be sole reviewer for security-sensitive code.

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