OpenAI Releases GPT-6 Sol with 50% Price Cut and Strong Agent Arena Gains

OpenAI launched GPT-6 Sol and GPT-6 Luna on September 22, 2026, cutting API pricing in half while delivering significant performance improvements on agentic and coding tasks. The release marks OpenAI's third major model family in six weeks, following GPT-6 Astra, and reflects the company's focus on efficiency-driven alternatives to its flagship frontier models.