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Slow, deliberate GPT-5.1 Pro vs Gemini 3: when I escalate for backend/infra and deep research, why the UX still hurts, and why this thing is fucking scary smart—arguably a better reasoner than most humans.

Hands-on Gemini 3 review: A look at performance, capabilities, and how it feels to use compared to GPT-5.1.

I thought GPT‑5 was incremental—until it shipped a complex prototype from a spec in one hour. This piece explains why speed + reliability make it feel like real software, the tradeoffs to watch, and how to use the right modes to get the most out of it.