OpenAI has introduced GPT-6.1 Sol, a recent model that approaches the performance of GPT-6 Astra at a lowered cost. The model is available in GitHub Copilot and is being compared to other advanced AI models like Anthropic's Claude Opus 5.5. GPT-6.1 Sol is noted for its efficiency, offering near-Astra performance at one-fifth the price. The launch has been reported by TechCrunch and The New Stack, emphasizing its economic efficiency and performance.