OpenAI expands GPT-6 family with Sol and Luna for Copilot

How it developed

1. September 22, 2026GitHub ChangelogWhere it started

   OpenAI expands GPT-6 family with Sol and Luna for Copilot

2. September 22, 2026TechCrunch AI

   OpenAI releases GPT-6 Sol and Luna with lower costs

   GPT-6 Sol and Luna API costs are halved compared to 5.6 series, with Sol errors reduced by half.

3. September 23, 2026The Rundown AI

   Anthropic and OpenAI duel on price and performance

   Anthropic’s Opus 5.5 tops the Intelligence Index while cutting costs by 40%.

4. September 23, 2026Matthew Berman

   OpenAI Launches GPT-6 Sol and Luna

5. September 26, 2026Matt Wolfe

   OpenAI Launches GPT-6 Sol and Luna Models