OpenAI's New GPT-6 Sol and Luna Models Bring Astra Improvements to Cheaper Tiers

OpenAI today launched GPT–6 Sol and GPT–6 Luna, two new models that follow GPT–6 Astra. OpenAI says the new models were developed using methods similar to Astra's for improvements in professional work, factuality, coding, computer use, and alignment. GPT–6 Sol is for everyday work, and it costs less than Astra. GPT–6 Luna is an even cheaper model. Luna is optimized for fast responses and higher volume, while Sol has more reasoning capability. The new models outperform their predecessors on OpenAI's benchmark tests, and GPT–6 Sol makes "about half as many mistakes" as GPT–5.6 Sol. GPT–6 Sol shows improvements in coding and computer use compared to GPT–5.6 Sol, and it matches or beats Claude Fable 5.1 scores on some benchmarks. OpenAI compared GPT–6 Sol to Opus 5 on several tests, but Anthropic released a new Opus 5.5 model today that outperforms Astra on some coding and knowledge work benchmarks. GPT–6 Sol and Luna are adopting the improved communicat