OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakes

OpenAI is expanding its GPT-6 generation with updated versions of the smaller Sol and Luna models, following the launch of GPT-6 Astra. Sol is designed for complex tasks like coding, while Luna targets high-volume clerical tasks like document summarization. OpenAI emphasizes big improvements in efficiency and affordability, most notably via a 50% price drop for API access compared to the 5.6 series, achieved through caching and inference upgrades. The company also claims its newest models produce more factually accurate answers and lower error rates in coding, with internal evaluations showing GPT-6 Sol makes about half as many mistakes as its predecessor while reaching Astra-level reliability.