モデル比較
GPT Image 2 vs Nano Banana 2: Same Prompts, Both Results
In our side-by-side test both models spelled every word of a three-line poster correctly. GPT Image 2 followed the brief more literally: it kept the sentence case we asked for, drew one tidy illustration and gave the candid photo a warm, shallow-focus polish. Nano Banana 2 took more liberties, setting the small print in capitals, adding a paper border and produce we didn't ask for, and staging a busier, more lived-in garage. Pick GPT Image 2 when the wording and layout must match the brief; pick Nano Banana 2 for quick 0.5K drafts, very wide banners and edits that pull from up to 14 reference images.
GPT Image 2 is OpenAI's image model, known for spelling text correctly and for precise masked edits. Nano Banana 2 is Google's Gemini 3.1 Flash Image model, built for speed, with sizes from a 0.5K draft up to 4K, up to 14 reference images and optional web or image search. Both create from a prompt and edit your own photos on PopNow, and both are paid per image with no subscription.
提供：Google
Nano Banana 2
高速なGemini画像生成。最大4K、参照画像は14枚まで
6クレジットから （1枚あたり）
ひと目で比較
| GPT Image 2 | Nano Banana 2 | |
|---|---|---|
| 開発元 | OpenAI | |
| モード | 画像を作成、画像を編集 | 画像を作成、画像を編集 |
| 最大解像度 | 4K | 4K |
| アスペクト比 | 15 | 14 |
| 参照画像 | 10 | 14 |
| 料金 | 1クレジット （1枚あたり） | 6クレジット （1枚あたり） |
GPT Image 2 vs Nano Banana 2 on the same prompts
Each prompt went to both models once at 1K, GPT Image 2 on medium quality: the market poster and garage photo on one afternoon, the JELLY FEST poster in a later session at 3:4. Render times include the queue.
Round 1 · Poster with exact text
A risograph-style poster for a neighborhood farmers market. Large headline text: "SATURDAY MARKET". Below it, smaller text: "Fresh bread · Local honey · 8am–1pm". Illustrated pears, sunflowers and a wicker basket in mustard, teal and coral ink on cream paper, slight print grain, clean layout with generous margins.
Both spelled “SATURDAY MARKET” and the second line correctly. GPT Image 2 kept “Fresh bread · Local honey · 8am–1pm” in sentence case and drew only pears, sunflowers and a basket. Nano Banana 2 switched that line to capitals, added a deckled paper edge and filled the basket with vegetables we never mentioned.
Round 2 · Candid photo of two people
Candid 35mm photo in a sunny, cluttered home garage: a man in his seventies with deep brown skin and a short gray beard tunes a vintage blue road bike while his adult daughter in denim overalls hands him a wrench, both laughing. Dust floating in the window light, shallow depth of field, natural skin texture, warm afternoon tones.
Both kept the people we described: a man in his seventies with a gray beard and his adult daughter in overalls, mid-laugh. GPT Image 2 went for a tight, warm, magazine-style frame with soft background blur. Nano Banana 2 pulled back to show the whole workshop, with a tool wall and a bike on a repair stand, and printed a real-looking brand name on the frame, which we blurred for this page.
Round 3 · Typography poster with exact text
Photograph of a bold typographic event poster pasted on a sunlit concrete wall: giant chunky rounded letters "JELLY FEST" in tangerine and cobalt, a subtitle "SUMMER PARADE — 08.08" in a clean grotesk typeface, layered with cut-out stickers of wobbling jelly cubes, iridescent soap bubbles and cherries, halftone riso-print texture, lemon-yellow and lilac color blocks; harsh afternoon sun casts a diagonal shadow across the poster. Editorial graphic design, crisp legible text, no logos, no brand names.
Both spelled “JELLY FEST” and “SUMMER PARADE — 08.08” without a slip. GPT Image 2 put the title in tangerine over cobalt as asked, drew true cube-shaped jellies and added no words of its own, though it set a couple of title letters in lower case and the sun's diagonal shadow barely shows. Nano Banana 2 made both title words orange with only a blue outline, invented four extra lines of event copy such as “1PM TILL LATE” and “DOWNTOWN SQUARE”, and swapped the cubes for jelly moulds.
気づいた違い
- Text in the image
- Neither model misspelled a word. The difference was obedience: GPT Image 2 reproduced the capitalisation and punctuation exactly as written, while Nano Banana 2 restyled the small line in capitals. If a client signs off wording letter by letter, that matters more than the illustration.
- Sticking to the brief
- GPT Image 2 drew what the prompt listed and little else. Nano Banana 2 added things that fit the theme, like extra vegetables, a mock-up paper border and a wall of tools. That's useful on a mood board and extra work when you need a clean asset.
- Photo look
- GPT Image 2 produced a polished, flattering, stock-photo look. Nano Banana 2 looked more like a real snapshot: wider, busier, flatter light and far more background detail. Hands holding the wrench came out natural on both.
- Speed in our run
- Both returned a 1K image in a little over a minute, queue included: about 65 to 70 seconds for GPT Image 2 and 70 to 75 for Nano Banana 2. If you're still hunting for an idea, Nano Banana 2's 0.5K size is the quicker way to sweep options.
- Sizes and shapes
- GPT Image 2 offers 15 aspect ratios up to 21:9 and returns up to ten images in one run. Nano Banana 2 reaches banner shapes as wide as 8:1 and as tall as 1:8, which suits website headers and skyscraper ads.
GPT Image 2 or Nano Banana 2: which to choose
| If you need | Pick | Why |
|---|---|---|
| Wording a client has signed off letter by letter | GPT Image 2 | It kept our capitals and punctuation exactly; Nano Banana 2 restyled one line. |
| A quick sweep of rough ideas | Nano Banana 2 | Its 0.5K size is the cheapest, fastest way to look at many directions. |
| A skyscraper ad or an 8:1 site header | Nano Banana 2 | GPT Image 2 stops at 21:9; Nano Banana 2 goes as wide as 8:1 and as tall as 1:8. |
| Ten takes of one idea in one go | GPT Image 2 | GPT Image 2 can return up to ten images per run. |
| Mixing a face, a product and a backdrop from separate photos | Nano Banana 2 | Nano Banana 2 reads up to 14 reference pictures. |
| A snapshot that feels lived-in rather than staged | Either | Nano Banana 2 went documentary, GPT Image 2 glossy; both kept the people we described. |
GPT Image 2を選ぶなら
- Posters, covers and labels where every word must match the brief
- Ten variations of one idea in a single run
- Clean product or editorial images without surprise props
Nano Banana 2を選ぶなら
- Fast 0.5K drafts before a 2K or 4K final
- Very wide banners and website headers up to 8:1
- Edits that combine a person, a product and a setting from up to 14 photos
プロンプトのコツ
- Put every word that must appear in double quotes, and say how it should be capitalised.
- If you want only what you listed, end the prompt with “nothing else in the frame”. It helps Nano Banana 2 most.
- For photos, name the camera and the light (35mm, window light, late afternoon). Both models respond to camera language.
- Check small print and logos before you publish: either model can invent a brand name on a product.
それぞれの実際の作例
ここにある画像と動画はすべてGPT Image 2 / Nano Banana 2で生成したものです。「同じものを作る」を押すと、同じプロンプトと設定でスタジオが開きます。
GPT Image 2
元画像画像を編集
自分の画像を用意してください
元画像画像を編集
自分の画像を用意してください
画像を作成
GPT Image 2 vs Nano Banana 2についてよくある質問
GPT Image 2はNano Banana 2より優れている？
In our side-by-side test both models spelled every word of a three-line poster correctly. GPT Image 2 followed the brief more literally: it kept the sentence case we asked for, drew one tidy illustration and gave the candid photo a warm, shallow-focus polish. Nano Banana 2 took more liberties, setting the small print in capitals, adding a paper border and produce we didn't ask for, and staging a busier, more lived-in garage. Pick GPT Image 2 when the wording and layout must match the brief; pick Nano Banana 2 for quick 0.5K drafts, very wide banners and edits that pull from up to 14 reference images.
GPT Image 2とNano Banana 2、安いのはどっち？
PopNowではGPT Image 2のほうが安く始められます：1クレジット、もう一方は6クレジット（1枚あたり）。どちらもサイズが大きく長いほど高くなり、正確な料金は生成前に表示されます。
Which is better for text in images, GPT Image 2 or Nano Banana 2?
Both spelled our three-line poster correctly. GPT Image 2 kept the exact capitalisation and punctuation, while Nano Banana 2 restyled the small text in capitals. For copy that must match letter for letter, start with GPT Image 2.
Is Nano Banana 2 faster than GPT Image 2?
Not by much at 1K: in our run both came back in a little over a minute with the queue. Nano Banana 2 also has a 0.5K size for quick drafts, which GPT Image 2 doesn't offer.
Can both edit my own photos?
Yes. GPT Image 2 edits up to ten source photos and supports a mask for pinpoint changes. Nano Banana 2 takes up to 14 reference images, which helps when the person, the product and the setting come from different pictures.
Do these models add things I didn't ask for?
Nano Banana 2 did in our test: extra vegetables, a paper border and a real-looking brand name on a bike frame. GPT Image 2 stayed closer to the list. Ask for “nothing else in the frame” and look over small details before you use an image.
このテストの費用は？
上の設定では、1回あたりGPT Image 2が5クレジット、Nano Banana 2が9クレジットです。生成前にボタンに表示される価格と同じです。
GPT Image 2とNano Banana 2は両方使える？
使えます。PopNowのアカウントとクレジット残高ひとつで両方使え、スタジオでプロンプトを書き直さずに切り替えられます。