OpenAI has released its new flagship AI model, GPT-5.6 Sol, to the public and revamped its naming system to Sol, Terra and Luna based on performance tiers. Sol is priced at $5 per 1 million input tokens and $30 per 1 million output tokens, while Luna costs $1 and $6. OpenAI also disclosed benchmark scores and highlighted cybersecurity results, alongside mostly positive early user feedback.

OpenAI on July 9 launched GPT-5.6, releasing three versions: Sol, Luna and Terra. Sol is the top-performance version, Luna focuses on speed and Terra is suited to everyday work. Sol supports an ultra mode that allocates more computing resources and can delegate tasks to multiple sub-models. OpenAI also launched ChatGPT Work, a GPT-5.6-based agent that gathers context across connected apps and files and creates work materials.