Do Son Stop flattening CSVs! The OpenAI Responses API now natively supports Word, Excel, and PowerPoint files for seamless, structure-aware AI analysis.
GPT-5.3-Codex
OpenAI's GPT-5.3-Codex is here. With 400K context, xhigh reasoning, and self-optimization, it’s the first agentic model designed to build and debug itself.