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Sol

Model ● Covered in 7 stories Compare ⇄ + Follow

Sol is OpenAI's flagship model in the GPT-5.6 family, designed to excel at UI and writing tasks while demonstrating improvements in intelligence and operational efficiency. Recently, Sol has been distinguished by significant cost optimization through techniques like autonomous kernel rewrites and speculative decoding, and has achieved notable results including finding a counterexample to a 60-year-old mathematical conjecture about group schemes. OpenAI launched Sol alongside Terra and Luna variants following Commerce Department clearance, positioning it as a high-performance option within the GPT-5.6 lineup.

Updated 3 August 2026

Specifications

No specifications recorded yet.

Latest developments

OpenAI cuts Luna API prices 80% and launches faster Sol inference The Neuron · 3 days ago · 42 GPT-5.6 kernel of truth: Sol can cut its own costs, says OpenAI The New Stack · 5 days ago · 25 Human mathematicians are being outcounterexampled TLDR · 1 week ago · 15
How to use GPT-5.6 Ben's Bites · 2 weeks ago · 31
GPT-5.6: Frontier intelligence that scales with your ambition TLDR Dev · 3 weeks ago · 28 OpenAI's big launch — and bigger departure Platformer · 3 weeks ago · 20
OpenAI's GPT-5.6 Clears Commerce Department Testing, Sol/Terra/Luna Launch Thursday The Neuron · 3 weeks ago · 47

Timeline

Month Quarter Year

July 2026

OpenAI releases GPT-5.6 model family with efficiency improvements and significant price reductions Model release

OpenAI releases GPT-5.6 family of models (Sol, Terra, Luna) with general availability on Amazon Bedrock Model release

OpenAI releases GPT-5.6 model family with three tiers (Luna, Terra, Sol) and new multi-agent capabilities Model release

OpenAI releases GPT-5.6 model family with improved efficiency and reasoning capabilities Model release

OpenAI releases GPT-5.6 in multiple variants alongside frontier AI model releases from competitors Model release

Relationships

Products & technology

  • OpenAI develops this model · 6 sources
  • GPT-5.6 derived from this model · 1 source

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