GPT-6 Astra catches 33% more cross-file bugs than Opus 5 in code review
GPT-6 Astra in code review: Gains, privacy, and cost
CodeRabbit's early evaluation of OpenAI's GPT-6 Astra shows it catches about 4% more actionable bugs overall than GPT-5.6 Sol, and 22% more than Opus 5. The real edge appears in harder cross-file reviews, where Astra's gains jump to 20% over Sol and 33% over Opus 5. But stronger reasoning comes at a premium: Astra costs $10/$50 per million input/output tokens, 2.5x Sol's price. The team also used Astra to build NIGHTSHIFT, an action RPG with a 988-node skill tree, and discusses privacy options like zero data retention.
The biggest jump comes on harder cross-file reviews, where Astra's gains reach 20% over Sol and 33% over Opus 5.