Lead DevelopmentFACT · 4/5••Via techcrunch
OpenAI launches GPT-6 Sol and Luna with lower cost, fewer errors
OpenAI launched two new GPT-6 models, Sol and Luna, on September 23, 2026. Sol targets complex tasks like coding and computer control, while Luna handles high-volume clerical tasks. Both are available in ChatGPT Work, Codex, and API at significantly reduced prices—about 50% cheaper than the previous 5.6 series—thanks to improved caching and inference, including up to 90% discounts on cached tokens. Sol achieves strong benchmark scores (e.g., 33.2% on AutomationBench), outperforming Claude Opus 5 in several tests, while Luna offers up to 93% cost savings on repetitive tasks. The release follows GPT-6 Astra and occurs in a competitive landscape, with OpenAI emphasizing safety and alignment in the deployment of more affordable AI agents.
- •OpenAI launched GPT-6 Sol and Luna on September 23, 2026, targeting complex and clerical tasks respectively.
- •GPT-6 Sol costs $2 per million input and $10 per million output tokens; Luna costs $0.10 and $0.50, both about 50% cheaper than previous series.
- •Prompt caching discounts up to 90% on reused tokens contribute to cost reductions.