Sam Altman, founder and CEO of ChatGPT owner OpenAI, said the release of its open-source artificial intelligence (AI) model would be delayed indefinitely, highlighting the challenges that the start-up faces in keeping pace with the open-source movement spearheaded by Chinese firms like DeepSeek. While OpenAI’s closed-source AI models remain months ahead in their capabilities, Altman said on Saturday that its first open-source model in years may take more time to develop. “We need time to run...