OpenAI's GPT-5.6 Sol Autonomously Post-Trained Smaller Luna Model

Jul 11, 2026

OpenAI's GPT-5.6 Sol independently fine-tuned the smaller Luna model using a single, fairly underspecified prompt. In internal RSI benchmarks, Sol scored 16.2 points higher than GPT-5.5, suggesting progress toward automated AI research.

Why it matters: This demonstrates a step toward autonomous AI self-improvement, which could accelerate AI development with reduced human intervention.

Full story at: The Decoder ↗