GPT-5.2 Pro

OpenAI's frontier-grade reasoning model with a 400k token context window, released in December 2025 as part of the GPT-5.2 generation.

Strengths

Handles complex reasoning and long-context tasks with the expanded 400k token window, enabling work with large documents and multi-step problems.

Best for

Applications requiring advanced reasoning capabilities and extended context handling, such as document analysis, research synthesis, and complex problem-solving.

Limitations

Designed for real-time inference rather than batch workflows; consider GPT-5.2 Pro (batch) if you need optimized batch processing performance.