o4 Mini Deep Research

OpenAI's specialized model for in-depth research and complex analysis tasks, with extended reasoning capabilities and a 200k token context window.

Strengths

Handles deep research problems and extended analytical work through its reasoning-focused architecture, building on the o3 Deep Research lineage.

Best for

Research synthesis, document analysis, and complex problem-solving where extended thinking and reasoning depth matter more than raw speed.

Limitations

Smaller context window (200k) than most current OpenAI models, and smaller model size suggests reduced performance on general-purpose tasks compared to GPT-5.2 or GPT-5.2 Pro.