OpenAI says GPT-5.4 Thinking and Pro are rolling out gradually across ChatGPT, the API, and Codex. The company positions GPT-5.4 as a unified frontier model for professional work with stronger coding, tool use, and 1M-token context.
GitHub said on March 5, 2026 that GPT-5.4 is now generally available and rolling out in GitHub Copilot. The company claims early testing showed higher success rates plus stronger logical reasoning and task execution on complex, tool-dependent developer workflows.
Cursor announced GPT-5.4 availability on March 5, 2026, saying the model feels more natural and assertive and currently leads its internal benchmarks. The update underscores rapid model-refresh cycles in AI coding tools.
Perplexity announced on March 5, 2026 that GPT-5.4 and GPT-5.4 Thinking are now available for Pro and Max subscribers. The move strengthens paid-tier access to frontier LLM options.
OpenAI announced GPT-5.4 on March 5, 2026, adding a new general-purpose model and GPT-5.4 Pro with stronger computer use, tool search efficiency, and benchmark improvements over GPT-5.2.
OpenAIDevs said Codex now supports a /fast mode where GPT-5.4 runs 1.5x faster while keeping the same intelligence and reasoning profile. The update targets faster coding iteration and debugging loops for developer workflows.
OpenAI said it published a new Chain-of-Thought controllability evaluation suite and research paper. The company reports that GPT-5.4 Thinking showed limited ability to obscure its reasoning, supporting chain-of-thought monitoring as a practical safety mechanism.
OpenAI announced that GPT-5.4 Thinking and GPT-5.4 Pro are rolling out in ChatGPT, while GPT-5.4 is already available in the API and Codex. The launch positions GPT-5.4 as a unified frontier model for reasoning, coding, and agentic workflows.