GPT-5 Pro is OpenAI’s most advanced model, offering major improvements in reasoning, code quality, and user experience. It is optimized for complex tasks that require step-by-step reasoning, instruction following, and accuracy in high-stakes use cases. It supports test-time routing features and advanced prompt understanding, including user-specified intent like "think hard about this." Improvements include reductions in hallucination, sycophancy, and better performance in coding, writing, and health-related tasks.
Input
Output
Context
400K
Max Output
128K
Parameters
—
Input Modalities
Output Modalities
Features
| Platform | Input | Output |
|---|---|---|
OpenRouter | $15.00 | $120.00 |
Data sourced from official provider APIs and documentation
Last updated: Mar 16, 2026
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