- What is the primary architectural innovation in GPT-5.1?
- GPT-5.1 uses an 'Omni-Native' integration that processes text, vision, and audio within a single unified transformer block. This allows for true cross-modal reasoning, such as interpreting voice subtext while analyzing visual diagrams.
- How does GPT-5.1 handle long documents?
- The model features a large 256k context window and a dynamic context management system. These features allow it to maintain coherence over extremely long documents, making it suitable for enterprise-level legal and medical applications.
- What are the pricing details for GPT-5.1 API usage?
- Standard API pricing is $10.00 per 1M input tokens and $30.00 per 1M output tokens. The 'Reasoning' mode incurs a 3x multiplier on token costs, while enterprise pricing is custom based on volume.
- What are the main limitations of GPT-5.1?
- GPT-5.1 is closed-source, which limits transparency and local hosting. It also has high API costs for the 'Deep' reasoning mode and may occasionally over-refuse benign prompts due to strict safety filters.