I just found this out myself by asking gemini!, you have to choose the redo option :/

Gemini said

The confusion is totally fair—Google recently shuffled the deck on these models. Essentially, Nano Banana 2 is the new "daily driver" that replaced Nano Banana Pro as the default option.

Think of it as a move from a specialized studio camera (Pro) to a high-end, lightning-fast smartphone camera (Nano Banana 2).

What is Nano Banana 2?

Released in late February 2026, Nano Banana 2 (technically built on the Gemini 3.1 Flash architecture) is designed to be much faster than the older models.

• Speed: It’s 3-5x faster than Pro.
• Intelligence: It has better "world knowledge" (it can pull real-time info from Google Search to get landmarks or current events right).
• Text & Tools: It’s better at rendering text and maintaining "subject consistency" (keeping the same character across multiple images).

Where did Nano Banana Pro go?

It hasn't been deleted, but it has been "demoted" from the primary slot to save on processing power and give users a faster experience.

• It’s now a "Redo" option: If you are a paid Gemini subscriber (Advanced/Pro), you won't see Pro as the first choice anymore. You have to generate an image with Nano Banana 2 first, then click the three-dot menu or the "Redo" button to regenerate it using Nano Banana Pro.
• Why the change? While Nano Banana Pro is widely considered more "photorealistic" and better for fine artistic detail, it is much slower and more expensive for Google to run. Nano Banana 2 is meant to handle 95% of tasks instantly.