Duolingo's shares plummeted by 38% after OpenAI's GPT-5 swiftly developed a language application, intensifying competition in the language technology sector.

Ex-Twitter CEO Parag Agrawal launches Parallel, an AI startup building a new web for machines that outperforms GPT-5 and human researchers in deep web tasks.

In response, OpenAI preserved access to GPT-5 Standard and Thinking models while restoring GPT-4o for ChatGPT Plus customers.

Former Twitter CEO, Parag Agrawal, has launched an AI startup called Parallel Web Systems, aimed at building a web infrastructure for AI systems.