Why can two apps using the same model feel very different?

Answer: Because each product adds its own prompts, memory, and workflow

Because each product adds its own prompts, memory, and workflow ✓ — Correct! The same model can feel very different after it is wrapped by different products. One product may add strong prompts, memory, file access, and better workflow design; another may give weak context, poor UI, or no tools. Users experience the whole package, not just the hidden model.

Because the computer changes the model itself — Wrong. Different computers can change speed, lag, or responsiveness, but they do not usually turn one model into another product experience by themselves.

Because the icon changes the model ability — Wrong. Icons and branding may change trust or mood, but they do not explain why one app plans better, remembers more, or completes complex tasks more reliably.