o3 o4 gptnext openai reinforcement-learning benchmarking model-performance model-risk long-context model-deployment fine-tuning sama gdb kevinweil xikun_zhang_ keren_gu boazbaraktcs
OpenAI launched the ChatGPT Agent, a new advanced AI system capable of browsing the web, coding, analyzing data, and creating reports, marking a significant step towards human-like computer use. The agent, distinct from and superior to o3, is considered the first public exposure of what was internally called o4, now merged into GPTNext. It features end-to-end reinforcement learning, can operate for extended periods (tested up to 2 hours), and is classified as "High" risk for biological misuse, with safeguards activated. Early benchmarks show mixed results, excelling in some tests like WebArena and BrowserComp but underperforming on others like PaperBench. Key figures involved include Sam Altman, Greg Brockman, and Kevin Weil, with technical insights from xikun_zhang_ and risk commentary from KerenGu and boazbaraktcs. The launch sparked speculation about GPT-5, which was confirmed not to be the case.