Better Call Sol The Workhorse

Zvi (Don't Worry About the Vase) · 2 days ago

OpenAI released GPT-5.6 Sol, a new frontier model priced at $5/$30, alongside cheaper variants Terra ($2.50/$15) and Luna ($1/$6), positioned as more cost-effective alternatives to existing models like Fable and Opus. Sol achieved notable results 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, though some benchmarks show Sol remains behind Fable in raw capability. The release reflects OpenAI's push toward reducing AI costs per task while expanding agent and coding capabilities, with Sol intended for practical task execution rather than complex reasoning compared to Fable.