GPT-5.4 Pro

OpenAI's most advanced general-purpose model from the GPT-5.4 series, designed for complex reasoning and analysis with a 1.05M token context window.

Strengths

Handles long-context tasks and complex reasoning with the largest context window in the GPT-5.4 lineup, supporting analysis of extensive documents and multi-step problem solving.

Best for

Extended document analysis, complex research tasks, and applications requiring sustained reasoning over large document sets where the full 1.05M context window is leveraged.

Limitations

Larger context window and capability tier mean it trades off against the smaller and faster variants like GPT-5.4 Mini and GPT-5.4 Nano; for straightforward or real-time tasks, the lightweight tiers may be more suitable.