GPT-5.4 Pro
OpenAI
openai/gpt-5.4-proGPT-5.4 Pro is the extended-reasoning tier of GPT-5.4, prized for low hallucination rates on hard problems. It suits complex research, coding, and analysis where reliability matters more than speed.
Cost rate
35x
Context
1.1M
Released
Mar 5, 2026
Input
TextImageFile
Output
Text
Support
ReasoningTool callingStructured outputs