Nano Banana in Detail

[ikaijua]

Nano Banana in Detail

Nano Banana is Google's image generation/editing model family — text-to-image, editing, character/product consistency; default image model in the Gemini app.

What it is. Google DeepMind's image generation/editing line; Nano Banana 2 (Gemini 3.1 Flash Image) is the default tier, Pro is the paid tier.
Signature capability. Flash speed near Pro quality, 4K output, character consistency, Google-Search-grounded real-world understanding.
Price. Usable within free quota; API per-image — 2 at ~$0.067, Pro at ~$0.134.
Note. 4K and Pro require payment; top of the leaderboard does not mean best in every scenario — some reviews rate Flux 2 Pro higher for photorealistic portraits.

Floors below follow “Product intro → Models & pricing → Tips & reference”.

Table of Contents

Product intro

1. What is Nano Banana?
2. Where to use it
3. Core capabilities

Models & pricing

4. Model lineup: Nano Banana 2 vs Pro
5. Pricing
6. Leaderboards & hands-on

Tips & reference

7. Prompt tips & tricks
8. FAQ
9. Sources

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[ikaijua]

What is Nano Banana?

One line to remember it. Google's family of image generation and editing models — text-to-image, edit existing images, and keep characters/products consistent. It is the default image model in the Gemini app.

What you can do with it.

• Generate images from a description: photorealism, illustration, product shots, posters
• Edit with a reference image: modify a specified region while keeping the subject intact
• Keep consistency: the same person/product across multiple images (up to 5 characters, 14 objects)

What makes it special.

• Speed + quality together: Nano Banana 2 reaches near-Pro quality at Flash-tier speed
• 4K output: up to 4K resolution for product and print work
• Real-world grounding: connects to Google Search — knows current brands, landmarks, news context

Where to use it. Gemini app (default image model), AI Studio, and third-party image sites.

How much it costs. Usable within Gemini's free quota; API is per-image — Nano Banana 2 ~$0.067/image (1K), Pro ~$0.134/image.

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Where to use it

• Gemini app (default): just describe the image; Nano Banana 2 is the default model
• AI Studio: developer playground with the latest preview models
• LMArena image leaderboards: blind tests against other models — where it ranks near the top
• Third-party platforms: many image sites carry the Nano Banana family (per-image pricing)

Tip: 4K and Pro models usually require a paid subscription (Gemini Advanced or above) or the API.

[ikaijua]

Core capabilities

• Text-to-image / image-to-image: generate from text alone, or edit with reference images
• Precise text rendering: clearer in-image text, better multilingual support
• Character consistency: up to 5 characters kept consistent across images
• Multiple reference images: up to 14 per request — great for product shots and character sheets
• Real-world knowledge: Google Search grounding for brands, landmarks, current events
• 4K output: up to 4K resolution
• Editing: modify a specified region while the rest stays intact

In one line: it is not just "pretty images" — text rendering, consistency and real-world grounding set it apart from plain image generators.

[ikaijua]

Model lineup: Nano Banana 2 vs Pro

	Nano Banana 2	Nano Banana Pro
Official model	Gemini 3.1 Flash Image	Gemini 3 Pro Image
Positioning	Speed-first, default	Quality-first, paid
Released	Feb-Mar 2026	Earlier (Pro line)
Resolution	Up to 4K	Up to 4K
Speed	2-3x faster (vs Pro)	Slower
Cost	~half of Pro	Higher
Consistency	5 characters / 14 objects	Reliable multi-subject
Leaderboards	Top of LMArena	Top of LMArena

How to choose: daily creation and bulk output use Nano Banana 2 (default, fast, half price); production-grade quality (ad assets, fine retouching) goes to Pro.

[ikaijua]

Pricing

Gemini subscription view (consumer):

• Free tier: Nano Banana 2 usable within quota
• Paid subscription (from $19.99/mo): higher quota, access to Pro

API view (per-image, no free tier):

• Nano Banana 2 (Gemini 3.1 Flash Image): ~$0.067/image (1K); input $0.50, output $60 (per 1M tokens)
• Nano Banana Pro (Gemini 3 Pro Image): ~$0.134/image (1K/2K), $0.24/image (4K)
• Batch / Flex tiers can roughly halve these

Note: third-party pricing varies widely (per-image or subscription packs); the official API is the most transparent. Subscription platforms usually bundle it in Gemini Advanced at $20-30/mo.

[ikaijua]

Leaderboards & hands-on

• LMArena text-to-image & image-edit boards: Nano Banana 2 and Pro both rank near the top (competing with GPT Image 2.5, Seedream, Muse Image)
• Photorealism: consistently top 2-3 globally
• Speed: seconds-level generation, good for high-frequency iteration

Honest caveat: leaderboards reflect human preference, not universal superiority; for photorealistic portraits some evaluations rate Flux 2 Pro higher — test your own scenario.

[ikaijua]

Prompt tips & tricks

• Consistency first: attach a reference image (character/product), then ask to "keep this character, change the background"
• Multiple references: up to 14 images — great for character sheets, product angles
• In-image text: for posters/signs, write the text content explicitly; multilingual support is strong
• Resolution: use 4K for print/product; 1K is enough for daily sharing — faster and cheaper
• Real-world facts: "2026 popular XX style" — Search grounding gives more current results

Beginner tip: try Nano Banana 2 within the free quota first; upgrade to Pro or the API once you confirm the style fits.

[ikaijua]

FAQ

What is the real difference between Nano Banana 2 and Pro? Speed and cost: 2 is 2-3x faster at ~half the price; Pro is slightly better on complex-scene quality. Daily work: 2 is enough; production: Pro.

Is it free? Yes within Gemini's free quota; 4K and Pro basically require a paid subscription or the API.

How does it compare to GPT Image 2.5? Both are top-tier: GPT Image 2.5 excels at editing control and complex instructions; Nano Banana excels at speed, text rendering and real-world grounding. Depends on your use case.

Do generated images carry provenance marks? Google applies SynthID invisible watermarking as an official safety measure.

Which platforms can I use it on? Gemini app / AI Studio officially, plus many third-party image sites (per-image pricing).

[ikaijua]

Sources

• Google AI model docs (Gemini 3.1 Flash Image): https://ai.google.dev/gemini-api/docs/image-generation
• OpenRouter model page (Nano Banana 2): https://openrouter.ai/google/gemini-3.1-flash-image-preview
• Vercel AI Gateway (pricing): https://vercel.com/ai-gateway/models/gemini-3.1-flash-image-preview
• Price analysis (Fello AI): https://felloai.com/cs/nano-banana-pricing/
• LMArena image leaderboards: https://arena.ai/leaderboard