SUPERNOVA Inc. (Headquarters: Minato-ku, Tokyo; President and CEO: Touken Kimoto; hereinafter referred to as "our company"), which develops generative AI services, will begin offering the AI models "Claude Sonnet 5" and "Claude Haiku 4.5" on its generative AI services "Stella AI" and "Stella AI for Biz" starting July 2, 2026 (Wed). Model Overview We are adding two Claude models with different characteristics: "Claude Sonnet 5" which prioritizes quality, and "Claude Haiku 4.5" which is fast. By using them according to the application, we can widely cover tasks that require accuracy to those that require speed and volume. Both models can be used without limit. *1 "Claude Sonnet 5" is the highest-performing model in Anthropic's Sonnet series, offering intelligence close to the higher-tier Claude Opus 4.8. Compared to the previous model, "Claude Sonnet 4.6," its accuracy in reasoning and knowledge tasks has improved, and the tendency for factual inaccuracies (hallucinations) and excessive agreement with the user (sycohancy) has been significantly reduced. "Claude Haiku 4.5" is Anthropic's fastest model. While maintaining a level of intelligence close to higher-tier models, its feature is its quick response, making it suitable for tasks requiring speed and volume, such as customer support, summarization, and classification. With the addition of these models, "Stella AI" and "Stella AI for Biz" will allow users to select the optimal model for their purpose in daily tasks such as creating business documents, research, and summarization. Future Outlook Generative AI technology is evolving daily, with new services emerging one after another. We will maximize the use of the latest technology to provide easy-to-use, high-quality services for our customers, acting as a bridge connecting technology and people to contribute to the realization of a society where no one is left behind. ■ Company Overview Company Name: SUPERNOVA Inc. Headquarters Address: Sumitomo Fudosan Toranomon