GPT-6 Astra in code review: Gains, privacy, and cost

GPT-6 Astra is being evaluated for code review, a task where changes can have system-wide impacts beyond isolated lines. Its illustrative task cost is $1.50, with input at $10.00 per 1M tokens and output at $50.00 per 1M tokens. For comparison, GPT-5.6 Luna costs $0.032 per task. Privacy concerns are addressed by Anthropic's Fable 5 and 5.1, which offer Zero Data Retention (ZDR) for eligible customers, with Enterprise Frontier Safeguards (EFS) designed to store retained data within customer infrastructure.