OpenAI Launches GPT-5.4 for Pro Workflows
OpenAI has officially launched GPT-5.4, a new frontier model targeting professional, coding, and agentic tasks. It features a massive ~1M token context window for processing entire codebases and new developer controls to guide its reasoning, aiming to reduce hallucinations and improve tool integration.
Released on March 5, 2026, GPT-5.4 unifies OpenAI's previously separate reasoning (GPT-5.2 Thinking) and coding (GPT-5.3 Codex) models into a single system. It is available through the API and in ChatGPT, where it replaces the older GPT-5.2 Thinking model for paid users, who have until June 5,
