OpenAI has introduced the GPT-5.6 series, comprising three vision-language models (text+image input, text output): the flagship GPT-5.6 Sol, mid-range GPT-5.6 Terra, and fast, low-cost GPT-5.6 Luna. All three are trained via reinforcement learning, producing outputs after long reasoning chains, and are fortified against jailbreaks and prompt injections.
API pricing per million tokens: Sol at $5 (input), $0.50 (cached input), $30 (output); Terra at $2.50, $0.25, $15; Luna at $1, $0.10, $6. Additionally, Cerebras plans to offer Sol access at speeds up to 750 tokens/s starting in July, with pricing to be determined.
OpenAI has not disclosed details on parameter count, architecture, training data, or methodology, only noting that training data includes publicly available web data, licensed data, user data, and human-annotated data.