OpenAI Launches GPT-5.4 for Pro Workflows
What happened
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.
Why it matters
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,
Key numbers
- 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,
Quick answers
What happened in 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.
Why does OpenAI Launches GPT-5.4 for Pro Workflows matter?
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,
