Since Nano Banana 2.1 came out on October 6, one question keeps coming up: does it beat GPT Image 2.5, the OpenAI model released a month earlier? Public votes still put OpenAI ahead. But an ad isn't just any image: it starts from your product photos, gets turned into dozens of variants and has to look real. On that ground, the match plays out differently.
Here's the comparison criterion by criterion, and why CreaFlow AI has moved to Nano Banana 2.1.
The verdict at a glance
| Criterion | Nano Banana 2.1 | GPT Image 2.5 | Edge |
|---|---|---|---|
| Speed | ≈ 15 s per image | ≈ 21 s per image (Flare) | Nano Banana 2.1 |
| Photo rendering and realistic scenes | More natural | Very good | Nano Banana 2.1 |
| Cost of reference photos | $1.50 per million tokens | $8 per million tokens | Nano Banana 2.1 |
| Price at high quality | $0.0336 per image at 1K | ≈ $0.053 per square image | Nano Banana 2.1 |
| Resolution | 4K | 4K as experimental | Nano Banana 2.1 |
| Formats | Up to 8:1 panoramas | From 1:3 to 3:1 | Nano Banana 2.1 |
| Small text | Needs checking | More reliable | GPT Image 2.5 |
| Public votes (Arena) | #5 | #1 and #2 | GPT Image 2.5 |
The two models at a glance
| Nano Banana 2.1 | GPT Image 2.5 | |
|---|---|---|
| Maker | Google DeepMind | OpenAI |
| Release | October 6, 2026 | September 8, 2026 |
| Versions | A single one, with three thinking levels | Flare (fast) and Sunburst (precision) |
| List price | $0.0336 per image at 1K, $0.113 at 4K | Per token: from about $0.006 to $0.053 per square image depending on quality |
| Maximum resolution | 4K | 3,840 px per side, experimental above 2,560 × 1,440 |
| Formats | Up to 8:1 panoramas | From 1:3 to 3:1 |
| Reference images | Up to 14 | Up to 16 |
| Editing one area | Yes, described in words | Yes, with a mask |
| Google Search grounding | Yes, web and images | Not announced |
| AI marking | Invisible SynthID watermark | C2PA metadata and invisible watermark |
Why Nano Banana 2.1 wins for ads
It's faster
On our generations, Nano Banana 2.1 takes 12 to 22 seconds per image, 15 on average. GPT Image 2.5 takes 14 to 37 seconds in its Flare version, 21 on average, and its Sunburst version is slower still. When you turn one angle into twenty variants to find the one that hooks, that's minutes saved on every batch.
It's more photographic
An ad that works on Facebook and Instagram looks like a real photo, not a generated image. That's the long-standing strength of the Nano Banana family: back in late September, our tests already found it clearly more photographic than GPT Image. Version 2.1 goes further, with more balanced light, more depth and more polished compositions. Hands, skin, materials, settings: everything feels more real.
It costs less on a real ad
On paper, GPT Image 2.5 at medium quality looks cheaper. But an ad never starts from nothing: you send the model your product photos, and those input images are billed. Google charges $1.50 per million tokens for them, OpenAI $8, more than five times as much. And at high quality, a Nano Banana 2.1 image costs $0.0336 at 1K, versus about $0.053 for GPT Image 2.5. The more product photos you send, the wider the gap in Google's favour.
It sees bigger
Nano Banana 2.1 officially goes up to 4K, while GPT Image 2.5 is experimental above 2,560 × 1,440. It handles panoramic formats up to 8:1, where GPT Image 2.5 stops at 3:1. It accepts up to 14 reference images and can rely on Google Search to depict a real place or object accurately. For a banner, a website visual or a campaign rolled out across every format, that's a real plus.
It keeps your product and your characters
Subject consistency is one of the three pillars of Google's update: a product, a logo or a face stays the same from one image to the next and from one edit to the next. And targeted editing is done in words: "replace only the background", and nothing else moves. To turn one scene into several ads, that's exactly what you need.
Where GPT Image 2.5 keeps the edge
To be fair, GPT Image 2.5 is still an excellent model.
- Public votes. On Arena, as of October 6, 2026, GPT Image 2.5 Sunburst is #1 in generation (1,425 points) and Flare #2 (1,398). Nano Banana 2.1 is #5 (1,328), but with only a few thousand votes so far, its score can still move. It's already Google's best model, well ahead of Nano Banana Pro.
- Small text. GPT Image 2.5 is slightly more reliable on fine print. With Nano Banana 2.1, keep your hooks short and check them. In CreaFlow AI, you fix any text in one click in the editor (see edit a creative).
Which one to choose for your ad
- A static ad for Facebook or Instagram: Nano Banana 2.1. Faster for iterating on your angles, more photographic, and cheaper with your product photos.
- Product in context, a lifestyle scene, a setting: Nano Banana 2.1, more natural.
- The images in a video ad: Nano Banana 2.1, for its photographic rendering and its consistency from one shot to the next.
- A large format or a banner: Nano Banana 2.1, in 4K and panoramic.
- A poster covered in small text: GPT Image 2.5 is still the safest bet.
If you're looking for layout ideas to test, our guide to static ad formats details fifteen of them.
CreaFlow AI moves to Nano Banana 2.1
CreaFlow AI has moved to Nano Banana 2.1, for your static creatives and your videos alike. You get everything that makes it better for ads, without changing a thing in how you work:
- Your static creatives and ad clones come out faster, with a more photographic look, from the real photos of your product.
- The images in your videos gain in realism: characters, shots and lifestyle scenes, before animation, editing, voiceover and subtitles. We explain it all in our guide to making a video ad.
- You don't configure anything. No API key, no prompt, no Google subscription. You paste your store link, CreaFlow AI analyses your brand, finds your angles and produces your ads.
- You stay in control. Every creative can be edited in the editor, and every video is approved step by step before you pay for the animation.
Try Nano Banana 2.1 on your product
The most telling thing is to see it on your own product. Open CreaFlow AI, paste your store link and ask Flow for your first static creatives, then a realistic video. You approve the script and the storyboard before paying for the animation (details on the create a video page).
The free plan, no credit card, lets you test your static creatives on your brand; video is included in every paid plan.
Article written on October 7, 2026. Speeds are measured on our own generations, rankings come from Arena as of October 6, 2026, and prices from the pricing published by Google and OpenAI. Models move fast: these figures may change.