Nano Banana Pro vs Seedream 4.5: Full Image Model Comparison (2026)
Seedream 4.5 is the cheaper portrait-first default, while Nano Banana Pro is the premium pick when realism, UI mockups, and harder prompts matter more than cost.
The practical split is simple: use Seedream 4.5 for lower-cost portrait batches and face fidelity, and move to Nano Banana Pro when the brief depends on landmark accuracy, live knowledge, spatial reasoning, or stricter editing stability.
Nano Banana Pro vs Seedream 4.5 (Quick Summary)
Here is the fastest way to understand the tradeoff.
Price (4K image)
Seedream 4.5
5 credits
Nano Banana Pro
30 credits
Speed (4K)
Seedream 4.5
~45 seconds
Nano Banana Pro
60-120 seconds
Best at
Seedream 4.5
Portraits + face fidelity
Nano Banana Pro
Maximum realism + versatility
Prompt adherence
Seedream 4.5
Excellent
Nano Banana Pro
Excellent + system-level control
Subject resemblance
Seedream 4.5
Best-in-class
Nano Banana Pro
Can drift unless prompted carefully
Text rendering
Seedream 4.5
Very strong
Nano Banana Pro
Strong, especially for infographics
UI/UX mockups
Seedream 4.5
Decent
Nano Banana Pro
Best-in-world
Real-world accuracy
Seedream 4.5
Good
Nano Banana Pro
Outstanding (landmarks, products, cars)
Spatial Reasoning
Seedream 4.5
Basic (Often fails physics/reflections)
Nano Banana Pro
Advanced (Understands 3D logic & light)
Knowledge Cut-off
Seedream 4.5
Frozen (Past training data only)
Nano Banana Pro
Live (Real-time web access)
Chart Accuracy
Seedream 4.5
Low (Hallucinates numbers)
Nano Banana Pro
High (Fetches real data)
HummingBytes Image Model Benchmark
A repeatable framework we use to compare model behavior under the same constraints.
Both models are evaluated using matched prompts and settings. We review side by side and score each test on adherence, realism, factual correctness, and structural stability.
- Portrait Fidelity Test
- Complex Realism Test
- Landmark Fidelity Test
- Named Object Fidelity Test
- Spatial Logic Test (Mirror Paradox)
- Live Data Retrieval Test (Live Market)
- Text Rendering Test
- Image Editing Accuracy Test
Quick Rule of Thumb
- Portraits and reference faces at scale: Seedream 4.5.
- Real places, objects, and perfect realism: Nano Banana Pro.
- No room for mistakes: Nano Banana Pro.
Image Generation Comparisons
Below are real outputs generated inside HummingBytes using the exact same prompts.
For prompt-only tests, drag each slider to compare Seedream 4.5 against Nano Banana Pro. For tests with uploaded references, use the model toggles to compare the same input image against each model.
Portrait Headshot (Seedream 4.5 Sweet Spot)
What this test checks
Seedream is often the best value model for generating professional headshots with clean studio backgrounds.
Winner:
Seedream 4.5Why this winner
Maintains closer facial resemblance and preserves the original expression more accurately.
Compare input vs
Complex Realism Prompt (Underwater Cinematic Test)
What this test checks
For highly detailed, physically complex scenes, Nano Banana Pro tends to preserve realism, lighting behavior, and material detail more reliably.
Winner:
Nano Banana ProWhy this winner
Underwater light behavior, skin texture, and depth cues are generally more convincing and coherent.
Compare input vs
Landmark Accuracy (Torres del Paine Test)
What this test checks
When a prompt depends on a real, recognizable location, Nano Banana Pro is more reliable at preserving landmark identity and environmental realism.
Winner:
Nano Banana ProWhy this winner
Torres del Paine landmark recognition and background coherence are stronger with fewer hallucinated geography details.
Compare input vs
Spatial Logic & Physics (The Mirror Paradox)
What this test checks
Most models struggle with reflections, often hallucinating text where it shouldn't. We tested both models with a prompt to see if they understand 3D space, not just 2D patterns.
Winner:
Nano Banana ProWhy this winner
Nano Banana Pro correctly reverses the text in the reflection and shows the correct text in the back of the paper. Seedream 4.5 reflects the text incorrectly and applies it to both sides of the paper, showing weaker spatial awareness.
Real-Time Knowledge (The "Live Market" Test)
What this test checks
Standard models rely on "frozen" training data (often 6-12 months old). We asked both models to visualize today's financial data to see if they could access the live web or if they would hallucinate outdated numbers.
Winner:
Nano Banana ProWhy this winner
Nano Banana Pro accessed the live web to fetch the exact spot prices for March 4, 2026, rendering an accurate snapshot of the current market. Seedream generated plausible-looking but factually incorrect prices. It relied on old training data (likely from 2024/2025), missing the current market reality entirely.
Named Object Fidelity (Ferrari 812 Test)
What this test checks
This test checks whether each model can reproduce a real Ferrari 812 Competizione, not just a generic supercar look.
Winner:
Nano Banana ProWhy this winner
Seedream resembles a Ferrari-like car but misses key 812 Competizione signatures; Nano Banana Pro is much closer to the real model in geometry, vents, and rear detailing.
UI Mockup Generation (Nano Banana Pro Showcase)
What this test checks
Nano Banana Pro is stronger for professional UX/UI design and realistic product mockups.
Winner:
Nano Banana ProWhy this winner
Layout coherence, visual hierarchy, and realistic product rendering are more consistent.
Complex Infographic Composition
What this test checks
For posters, infographics, and multi-element compositions, Nano Banana Pro tends to nail detail with fewer mistakes.
Winner:
Nano Banana ProWhy this winner
Multi-element arrangement and text alignment remain cleaner with fewer visual collisions.
Poster Composition Test
What this test checks
This test focuses on visual composition, texture realism, and art direction in a cinematic poster-style scene.
Winner:
Seedream 4.5Why this winner
Cleaner negative space discipline and more balanced typography integration, resulting in a stronger poster-ready composition.
Typography + Design Composition Test
What this test checks
This test evaluates typography quality, hierarchy, and composition discipline in a luxury poster layout.
Winner:
Nano Banana ProWhy this winner
Stronger vertical hierarchy and cleaner separation between headline block and product, resulting in a more traditional luxury poster composition.
Text Rendering Test
What this test checks
When a prompt requires readable typography and clean text hierarchy, Seedream 4.5 often delivers stronger out-of-the-box clarity.
Winner:
Seedream 4.5Why this winner
Text blocks are more readable with fewer letter distortions in this test, and the Nano Banana Pro result also missed the QR code.
Try Nano Banana Pro on HummingBytes
HummingBytes lets you generate with both Nano Banana Pro and Seedream 4.5 in one workflow with no setup and no platform switching.
Image Editing Comparisons
Both models received the same input image and prompt. Drag each slider to compare the editing results.
These tests evaluate how well each model preserves identity, handles edge separation, and integrates edits into a coherent result.
Identity-Preserving Background Change
What this test checks
Both models receive the same portrait and must replace only the background while keeping the subject's face, expression, clothing, and pose completely unchanged.
Winner:
Nano Banana ProWhy this winner
Better identity preservation and more coherent environmental integration.
Compare input vs
Person Removal (Object Erasure)
What this test checks
Both models receive an image of a couple and must cleanly remove one person while preserving everything else about the scene.
Winner:
Nano Banana ProWhy this winner
Almost no change to the original image aside from the removal. Seedream altered colors, camera angle, and several other aspects.
Compare input vs
Text Replacement on Physical Sign
What this test checks
Both models receive a photo of a letter board sign and must replace one word while preserving the sign's physical appearance and surroundings.
Winner:
Nano Banana ProWhy this winner
Preserved the flat letter style and scene faithfully. Seedream made the text look 3D and altered the sign appearance.
Clothing Replacement (Garment Swap)
What this test checks
Both models receive a street portrait and must replace only the outer jacket with a different garment while preserving everything else.
Winner:
Nano Banana ProWhy this winner
Preserved body proportions and other clothing faithfully. Seedream altered body proportions and other clothing pieces despite explicit constraints.
Lighting Transformation (Identity Under Extreme Light Shift)
What this test checks
Both models receive the same portrait and must apply a dramatic cinematic night relight while preserving identity, expression, pose, clothing, and scene structure.
Winner:
Nano Banana ProWhy this winner
Provided better identity stability while adapting to extreme lighting conditions.
Object Removal (Background Crowd Cleanup)
What this test checks
Both models receive the same street portrait and must remove background people while preserving the subject and reconstructing the environment naturally.
Winner:
Nano Banana ProWhy this winner
Stronger geometric stability and cleaner environmental reconstruction after removing background subjects.
Seedream 4.5 is a specialist
Up to 6x cheaper than Nano Banana Pro · ~45 seconds · Best-in-class face fidelity
If your workflow is portrait-heavy and cost-sensitive, Seedream 4.5 is often a strong option: it delivers very good face fidelity at a much lower price than Nano Banana Pro, even if it is not perfect in every case.
- Best-in-class face fidelity in many portrait tasks.
- Excellent prompt adherence for clean compositions.
- Up to 6x cheaper than Nano Banana Pro per image.
Nano Banana Pro is an anything model
Best-in-world UI mockups · Outstanding landmark accuracy · Top-tier realism
When the prompt is complex, the subject is real, or the output needs to look flawless, Nano Banana Pro consistently outperforms across categories.
- Best photorealism for complex environments.
- Stronger named object and landmark fidelity.
- Best-in-world UX/UI mockup generation.
- You need up-to-the-minute accuracy. Unlike Seedream, Nano Banana Pro can generate infographics with live data (news, weather, stock prices), making it the only choice for editorial content and social media updates.
- Understands 3D spatial logic (reflections, occlusion, perspective), not just 2D pattern matching.