openais biggest announcement ever chatgpt app ai agent gpt 5 pro and sora 2 Blog January 3, 2026 · Comments off OpenAI's Biggest Announcement Ever! ChatGPT App, AI Agent, GPT-5 Pro, and Sora 2: A Complete Guid...OpenAI just made your entire tech stack obsolete...OpenAI DevDay 2025 Keynote: Launching GPT-5 Pro API, Sora 2 Video Generation, Apps SDK, and AgentKitOpenAI’s Sam Altman Talks ChatGPT, AI Agents and Superintelligence — Live at TED2025OpenAI DevDay 2025: Apps, Agents, Sora 2 & GPT‑5 ProOpenAI’s Next Gear: GPT-5 Codex, Sora 2 & Agents in 60sSora 2 + GPT-6: OpenAI Just Shocked EveryoneOpenAI DevDay 2025: Apps SDK, AgentKit, GPT‑5 Pro, Sora 2 ExplainedWhy Grok Outshines ChatGPT and Gemini in AI ConversationsOpenAI was dead… Then GPT-5.2 dropped12