Sol
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 · 4 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
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
- OpenAI cuts Luna API prices 80% and launches faster Sol inference
- GPT-5.6 kernel of truth: Sol can cut its own costs, says OpenAI
- Human mathematicians are being outcounterexampled
- How to use GPT-5.6
- GPT-5.6: Frontier intelligence that scales with your ambition
- OpenAI's big launch — and bigger departure
- OpenAI's GPT-5.6 Clears Commerce Department Testing, Sol/Terra/Luna Launch Thursday