OpenAI has launched its most powerful AI model yet, GPT-6 Astra, with co-founder Greg Brockman declaring the arrival of a new era of artificial general intelligence (AGI — systems capable of performing tasks across domains at a level surpassing humans). The announcement comes as the company, led by Sam Altman and preparing for a stock market listing, claims to have developed AI with superhuman capabilities, though Altman himself acknowledged the term is more of a marketing concept than a precise technical one. Experts are unconvinced: AI researchers and advisers warn that there is no agreed definition of AGI, that comparing machine and human intelligence is fundamentally misleading, and that OpenAI's declarations appear driven more by marketing — or, as one academic put it, a quasi-religious belief — than by verifiable scientific milestones.