For the first time, OpenAI isn't shipping one model with thinking dials. GPT-5.6 comes as three genuinely separate LLMs—Sol, Terra, and Luna—with different training, different pricing, and different capability ceilings. The comparison that matters is Sol against Claude Fable 5, Anthropic's most capable public model right now. Sol costs $5 per million input tokens and $30 output. Fable 5 is $10 and...