According to OpenAI, GPT-5.6 Sol independently fine-tuned the smaller Luna model, triggered by a single "fairly under-specified prompt." In OpenAI's internal RSI benchmark for recursive self-improvement, Sol scores 16.2 points higher than GPT-5.5. OpenAI believes the "automated researcher" is within reach.

OpenAI will launch its GPT-5.6 models globally this Thursday. Release by July 31, 2026 is at 98.8% YES.

OpenAI will launch its GPT-5.6 model family starting July ninth. These new models offer improved reasoning and coding capabilities for users. GPT-5.6 Sol, Terra, and Luna cater to…