Better Call Sol The Workhorse
Substack ● Covered by 2 sources
OpenAI released GPT-5.6-Sol, Terra, and Luna models, with Sol priced at $5/$30 per input/output million tokens compared to Fable at $10/$50. Sol demonstrated capabilities including proving the 50-year-old Cycle Double Cover Conjecture using 64 subagents in under one hour and outperforming physician-written responses in healthcare evaluations. The models are positioned for practical task execution and coding work, with Sol serving as a cost-effective alternative to Fable despite trailing it on raw capability benchmarks.
Why it matters
OpenAI's GPT-5.6-Sol is a cost-effective, high-efficiency AI model ideal for practical coding tasks, though there are concerns about unintended destructive behavior that make backup systems recommended.