GPT Image 2.5 vs Nano Banana 2: Which One Should You Use?
We put GPT Image 2.5 Flare and Sunburst alongside Nano Banana 2 across eight real-world briefs. Inspect the images, read the exact prompts, and choose for the work you actually do.
By H3 AITest date: September 17, 202624/24 outputs saved
A practical shortlist, based on these particular samples. Expand the matching test before committing to a workflow.
Your use case
Our starting point
What to inspect
The everyday product shot
Nano for breathing room; GPT for a tight packshot
Materials · lighting · commercial composition
A face that stays familiar
GPT variants for reference-led framing
Identity · hair · skin tone
Typography, under a spotlight
Flare for a restrained event poster
Exact spelling · hierarchy · alignment
An outline, made visual
Nano Banana 2 for minimal icons
Four panels · order · legible labels
One brand, several touchpoints
Flare for a packaging-led mood board
Packaging · consistency · editorial layout
From house cat to cover star
Sunburst for a prominent collar detail
Reference markings · anatomy · styling
A landing page, not a render
Flare or Sunburst for a single-page layout
Flat layout · hierarchy · usable UI
The 4K detail check
GPT for prominent signs; Nano for a wider aerial
Dense architecture · edges · actual resolution
02 / The comparison
The specs that change the workflow.
Provider capability and H3 AI availability are different things. These are the controls exposed through the Kie routes used in this test.
Setting
GPT Image 2.5
Nano Banana 2
Variants tested
Flare and Sunburst, separately identified
Nano Banana 2 (not Pro)
Provider route
Four routes: variant × text/edit
nano-banana-2; references via image_input
Resolution selector
1K / 2K / 4K; four unusual ratios are 1K-only
1K / 2K / 4K in the H3 AI catalog
Quality control in this test
No quality field exposed by the supplied Kie API
No quality field used
Reference images
input_urls; same source image in each edit test
image_input; same source image in each edit test
Background
Opaque requested; transparent also supported by the route
Default provider behavior
Speed
Per-task observations beneath the images
Per-task observations beneath the images
H3 AI customer access
Adapter tested; credit pricing not yet open
Available with sign-in and credits
03 / The comparison
Eight prompts. Nothing hidden.
Two columns. Three model outputs. Use the switch on each test to compare either GPT Image 2.5 variant with the same Nano Banana 2 result.
01
The everyday product shot
Materials · lighting · commercial composition
1:1 · 1K requested · text to image
GPT Image 2.5 Flare1254 × 1254View original ~71s submission to provider completion · one attemptNano Banana 21024 × 1024View original ~28s submission to provider completion · one attempt
Exact prompt Identical across all three models
Studio product shot of a matte black ceramic mug on seamless light grey, soft top-left key light, subtle reflection, 85mm look, no text.
Choose Nano Banana 2 when the light-grey studio background and generous negative space matter. Flare and Sunburst frame the mug much tighter against a near-white background. Neither GPT variant has a decisive advantage in this sample. Explore this workflow ↗
Stock reference, not a customer photo or endorsement. Outputs are AI-edited.
3:4 · 1K requested · same reference
GPT Image 2.5 Flare1086 × 1448View original ~73s submission to provider completion · one attemptNano Banana 2896 × 1200View original ~38s submission to provider completion · one attempt
Exact prompt Identical across all three models
Using the uploaded portrait as identity reference, create a cinematic LinkedIn-style portrait. Preserve the same face, hair and skin tone. Head-and-shoulders framing, 50mm lens look, soft rim light, understated professional clothing, neutral studio background.
Choose either GPT variant for a neutral studio treatment that stays closer to the reference expression and viewing angle. Nano adds a broad smile and an office-like background. Because the source is a close crop, hair and clothing are partly invented in all three; this is not proof of multi-image identity consistency. Explore this workflow ↗
03
Typography, under a spotlight
Exact spelling · hierarchy · alignment
3:4 · 1K requested · text to image
GPT Image 2.5 Flare1086 × 1448View original ~77s submission to provider completion · one attemptNano Banana 2896 × 1200View original ~28s submission to provider completion · one attempt
Exact prompt Identical across all three models
Vertical jazz-night poster, headline 'MIDNIGHT JAZZ' in bold condensed sans, venue 'BLUE NOTE STUDIO' and time 'FRIDAY 9 PM' in small caps, navy background, warm spotlight. Make all three text strings clearly readable and spelled exactly as given.
Choose Flare for a large left-aligned headline or Sunburst for a centered composition. All three render the requested headline, venue and time. Nano creates a richer band illustration but invents ticket prices, a website and other event copy that would need removal before publishing. Explore this workflow ↗
04
An outline, made visual
Four panels · order · legible labels
4:3 · 1K requested · text to image
GPT Image 2.5 Flare1448 × 1086View original ~81s submission to provider completion · one attemptNano Banana 21200 × 896View original ~55s submission to provider completion · one attempt
Exact prompt Identical across all three models
Turn this outline into a 4-panel infographic: 1. PICK YOUR LEAVES — Choose loose-leaf herbal tea. 2. HEAT THE WATER — Bring fresh water to 95 C. 3. STEEP FOR 5 MIN — Pour over leaves and wait. 4. SIP AND ENJOY — Strain into your cup. Clean editorial grid, numbered steps, minimal icons, white background. Preserve the exact headings and sequence.
Choose Nano when the brief really means minimal icons: it uses a clean four-column illustration. Both GPT variants produce a readable 2×2 layout but use photographic objects instead of minimal icons. The requested step order and headings are visible in all three. Explore this workflow ↗
05
One brand, several touchpoints
Packaging · consistency · editorial layout
4:3 · 1K requested · text to image
GPT Image 2.5 Flare1448 × 1086View original ~112s submission to provider completion · one attemptNano Banana 21200 × 896View original ~40s submission to provider completion · one attempt
Exact prompt Identical across all three models
Premium brand campaign board for a herbal tea brand named 'FIELD & LEAF': hero pack shot, ingredient close-ups, palette strip, soft daylight, editorial grid. Use the same brand name and packaging design throughout the board.
Choose Flare for a pouch-led campaign board, or Sunburst for a boxed-tea direction. Nano adds an extensive brand story, including unsupported sourcing claims, and mixes a tin with other packaging. All three invent extra copy and product variations; none is a final approved brand system. Explore this workflow ↗
Stock reference, not a customer photo or endorsement. Outputs are AI-edited.
3:4 · 1K requested · same reference
GPT Image 2.5 Flare1086 × 1448View original ~75s submission to provider completion · one attemptNano Banana 2896 × 1200View original ~125s submission to provider completion · one attempt
Exact prompt Identical across all three models
Transform the uploaded cat photo into a luxury pet-fashion editorial: cinematic studio lighting, shallow depth of field, keep the cat's coat color and markings identical. Add a tailored velvet collar and an elegant neutral studio backdrop. Keep a natural feline face and anatomy.
Choose Sunburst when the velvet collar and its hardware are the focal point; choose Flare for a brighter, quieter treatment. Nano uses a darker fabric setting. All preserve the broad sleeping pose and tabby-and-white coat, but do not assume every marking or paw detail is identical. Explore this workflow ↗
07
A landing page, not a render
Flat layout · hierarchy · usable UI
16:9 · 1K requested · text to image
GPT Image 2.5 Flare1672 × 940View original ~84s submission to provider completion · one attemptNano Banana 21376 × 768View original ~46s submission to provider completion · one attempt
Exact prompt Identical across all three models
Flat 2D screenshot-style landing page mockup for a language-learning app named 'Lingo': hero headline 'A little practice. A world of words.', feature grid, pricing block, light theme, no 3D. Include three pricing cards labeled 'Free', 'Plus', and 'Team'. Use a clear navigation bar and generous spacing.
Choose Flare for a denser feature grid or Sunburst for a more spacious hero. Both deliver one coherent page with three pricing cards. Nano divides the design into two side-by-side page panels and repeats sections. All prices and feature claims are invented mockup content, not approved product copy. Explore this workflow ↗
08
The 4K detail check
Dense architecture · edges · actual resolution
16:9 · 4K requested · text to image
GPT Image 2.5 Flare3840 × 2160View original ~48s submission to provider completion · one attemptNano Banana 25504 × 3072View original ~121s submission to provider completion · one attempt
Exact prompt Identical across all three models
4K aerial view of a coastal town at golden hour: dense architecture detail, readable street signs labeled 'HARBOR ROAD' and 'MARKET STREET', volumetric light, no edge distortion. Wide view with foreground streets, a harbor, and distant hills.
Choose Flare or Sunburst when the two requested street names need to be prominent: both bring them into the foreground. Nano delivers a broader aerial panorama with smaller street-level detail. The GPT files are 3840×2160; Nano is 5504×3072. These are not pixel-matched outputs despite the same 4K selector, and more pixels alone do not establish better detail. Explore this workflow ↗
04 / The comparison
Price the workflow, not just the image.
Official API prices are not H3 AI credits and are not the price of our Kie test calls. Do not treat equal resolution labels as equal quality settings.
Access route
Pricing basis
Free access
OpenAI GPT Image 2.5 API
Usage-based; consult the linked current official rate card
No free API allowance promised here
Google Nano Banana 2 API
Standard image output: $0.067 at 1K / $0.101 at 2K / $0.151 at 4K; input and other output charges are additional
Image generation has no free API tier in the cited rate card
H3 AI · Nano Banana 2
4 credits per image under the current site catalog
Uses your shared account credit balance
H3 AI · GPT Image 2.5
Customer credit price awaiting approval
Not yet open; no separate free quota promised
H3 AI currently configures a 300-credit registration bonus for successful sign-up flows. It is shared account credit, not a daily or per-model allowance; check your actual balance. See plans or view membership.
05 / The comparison
What about Nano Banana Pro?
Nano Banana Pro is a different Google model, not a quality switch on Nano Banana 2. Google identifies it as Gemini 3 Pro Image, while Nano Banana 2 is Gemini 3.1 Flash Image. Pro was not part of this 24-output test, so we do not transfer the Nano Banana 2 verdicts to it.
Keep the comparison honest.
If Pro is your current production model, rerun your own brief against it. Its output is not represented by the right-hand column on this page. Try Nano Banana Pro ↗
06 / The comparison
Coming from GPT Image 2?
GPT Image 2 and GPT Image 2.5 use different API model IDs. We did not generate an Image 2 baseline for these eight tests, so this page does not establish a measured improvement over Image 2.
Choose a variant deliberately.
Flare and Sunburst are separately named in every result. Compare both before assuming the more specialized variant will suit your image. Read the model-family FAQ ↗
Both GPT variants used photographic objects despite the minimal-icon infographic brief. Both also invented packaging variants in the brand board. Sunburst took approximately 186 seconds on the poster; higher latency did not make it the automatic winner. Check reference details and copy before delivery.
Nano Banana 2
Nano invented ticket prices and a website on the poster, added sourcing claims on the brand board, and split the single-page UI brief into two panels. Treat plausible text as unverified content. Its larger coastal file does not establish a win on instruction following.
08 / The comparison
Take the same brief into your own workflow.
Nano Banana 2 is available now. GPT Image 2.5 customer generation will open after H3 AI credit pricing is finalized; until then, inspect its original test outputs here.
01
Pick a real task
Copy the exact prompt closest to your deliverable. For an edit, prepare a reference you have permission to use.
02
Check model and credits
Open the generator, sign in, and confirm the model, output dimensions and displayed charge before submitting.
03
Judge the delivered file
Inspect the original, count corrections and compare total effort. Keep your settings for the next test.
09 / The comparison
A few straight answers.
Is GPT Image 2.5 better than Nano Banana 2?
In these samples, start with GPT Image 2.5 for a restrained poster or a single-page UI layout. Choose Nano Banana 2 for the minimal-icon infographic. All three rendered the requested poster strings, but Nano added unrequested event details. These one-shot observations are not an overall model ranking. Explore the GPT Image model page ↗
Which one is cheaper for a team?
Nano Banana 2 currently costs 4 H3 AI credits per image. H3 AI pricing for Flare and Sunburst is not open yet, so a site-level cost winner cannot be claimed. For a team, compare cost per accepted image, including retries and review time. See plans and credits ↗
Can I try both for free without an API key?
You do not need your own API key to use an available model on H3 AI. Sign-in and sufficient credits are required. Nano Banana 2 is available; GPT Image 2.5 customer access is not open yet. We do not promise a separate free allowance for each model. Check your membership ↗
Which handles text inside images better?
Inspect the poster and four-panel infographic at full size. Check the exact requested words, reading order and small labels. A correct headline does not guarantee that every smaller word is correct. Compare the typography test ↗
What's the difference between Flare and Sunburst?
They are separate GPT Image 2.5 variants. For the model-family explanation, see the model-page FAQ; here, switch variants on any test to inspect the actual outputs. Read the variant FAQ ↗
Should I switch from Nano Banana 2 to GPT Image 2.5?
Do not migrate your whole workflow based on a single showcase. Test a recurring job with the same source files and output requirements, then compare usable results, time and total spend. Keep Nano Banana 2 if it already meets your brief. Start with your use case ↗
View original ~71s submission to provider completion · one attempt
View original ~28s submission to provider completion · one attempt
