Synopsys is trading at $455.00, up 4.61% in pre-market on October 1, following its multi-year partnership with OpenAI announced September 30. - The companies plan to develop GPT-Synopsys, an AI model using Synopsys’s electronic-design tools for chip-design workflows. - Reuters reported OpenAI will pay a training subscription fee; the partners expect to share revenue as customers use the model. - Broader technology sentiment is supportive, while market indices are up less than 0.5%.