Users switch for better reasoning and less safety filtering. Gain: 80.9% SWE-bench (vs GPT-5's ~70%), 200K token context for long documents, more natural writing tone. Trade-off: no image generation, smaller ecosystem.

Users switch for free tier value and context window. Gain: 1M token context, free tier accepts huge files/videos, Google Workspace integration. Trade-off: privacy concerns, occasional hallucinations.

Users switch for research with citations. Gain: every answer cites sources, better for fact-checking, real-time web search. Trade-off: not for creative writing or coding, billing issues reported.

Enterprise users switch for Microsoft 365 integration. Gain: native Word/Excel/Outlook integration, included in many M365 licenses. Trade-off: less capable for creative tasks.

Users switch for ecosystem integration. Gain: built into Meta, Instagram, WhatsApp, Messenger - accessible and free. Trade-off: less capable, no paid tiers with advanced features.