GPT-5.4 (March 2026) is OpenAI's frontier model, introducing native computer use, a tool-search mechanism, and a 1M-token context window — enough to analyze an entire codebase or document set in a single request. A strong default for complex, agentic, long-context work.
You can try it free via Vercel AI Gateway ($5/month in credits, no credit card); pass-through pricing applies after that. See the providers below.