Flux Ultra 1.1 vs GPT-Image 1.5
Houseplants, foliage, and botanical still life — see how these models compare with real AI-generated outputs.
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Comparing Flux Ultra 1.1 vs GPT-Image 1.5 for plants & greenery? This page breaks down how the two image models differ on realism, text rendering, editing flexibility, cost, and final polish — with a clear recommendation for which to test first.
Flux Ultra 1.1 premium image generation with exceptional detail and photoreal output for high-end final visuals. GPT-Image 1.5 high-fidelity image generation with strong prompt adherence for accurate, detailed scenes. Below you'll find a quick verdict, a best-for breakdown, an attribute-by-attribute scoring table, real side-by-side outputs, and answers to the most common questions.
Which Model Should You Choose?
Short answer: Flux Ultra 1.1 is better for premium photoreal detail, while GPT-Image 1.5 is better for accurate prompt adherence. If you are creating plants & greenery, start with GPT-Image 1.5 because it costs fewer credits per output and lets you test more directions, then switch to Flux Ultra 1.1 for polished, higher-resolution final assets.
| If you need… | Choose | Why |
|---|---|---|
| Lower-cost exploration and more variants per credit | GPT-Image 1.5 | GPT-Image 1.5 costs 8 credits to start, so you can test more directions for less. |
| Polished, ready-to-ship final assets | Flux Ultra 1.1 | Flux Ultra 1.1 produces stronger final-asset polish for campaign-ready output. |
| Readable text in designs, overlays, and packaging | GPT-Image 1.5 | GPT-Image 1.5 renders labels and typography more cleanly. |
| Editing and reference-driven iteration | GPT-Image 1.5 | GPT-Image 1.5 is more flexible for editing from references or existing outputs. |
| Consistent characters and repeated campaign visuals | Either model | Either model holds character and style consistency better across outputs. |
| Plants & Greenery specifically | Flux Ultra 1.1 | Flux Ultra 1.1 scores higher on realism, which matters most for plants & greenery. |
How They Compare, Criterion by Criterion
| Criteria | Flux Ultra 1.1 | GPT-Image 1.5 | Winner |
|---|---|---|---|
| Realism | ●●●●● | ●●●●○ | Flux Ultra 1.1 |
| Text accuracy | ●●○○○ | ●●●●○ | GPT-Image 1.5 |
| Editing flexibility | ●●○○○ | ●●●○○ | GPT-Image 1.5 |
| Cost efficiency | ●●●○○ | ●●●○○ | Tie |
| Final polish | ●●●●● | ●●●●○ | Flux Ultra 1.1 |
| Consistency | ●●●●○ | ●●●●○ | Tie |
| Best first test | ●●●○○ | ●●●○○ | GPT-Image 1.5 |
How We Compare These Models
Models compared
Flux Ultra 1.1 vs GPT-Image 1.5
Use case
Plants & Greenery
Flux Ultra 1.1 — best for
premium photoreal detail
GPT-Image 1.5 — best for
accurate prompt adherence
Flux Ultra 1.1 — avoid if
You need editing, text accuracy, or low-cost iteration
GPT-Image 1.5 — avoid if
You need the lowest cost or advanced editing flexibility
Credits per image (Flux Ultra 1.1)
16 credits
Credits per image (GPT-Image 1.5)
8 credits
Last updated
June 8, 2026
What the Examples Show
Realism
Flux Ultra 1.1 tends to produce more natural skin texture, lighting, and detail in these outputs.
Text accuracy
GPT-Image 1.5 renders any labels, overlays, or typography more cleanly.
Commercial usability
Flux Ultra 1.1 is closer to a ready-to-use image asset; GPT-Image 1.5 is better for concepting.
Recommended next step
Use GPT-Image 1.5 for first-pass variants, then Flux Ultra 1.1 for final polish.
Plants & Greenery — Side-by-Side Results
Click to generate a side-by-side plants & greenery comparison
Feature Comparison
| Feature | Flux Ultra 1.1 | GPT-Image 1.5 |
|---|---|---|
| Provider | Black Forest Labs | OpenAI |
| Subcategories | text-to-image | text-to-image |
| 1080p / 2k Mode | Yes | Yes |
| 4k Mode | No | No |
| NSFW Rating | Strict | Strict |
| Aspect Ratio | 1:1, 16:9, 9:16, 3:4, 4:3, 21:9 | 1:1, 16:9, 9:16, 3:4, 4:3 |
| Starting Price | 16 credits | 8 credits |
Flux Ultra 1.1 Strengths
- Exceptional, ultra-high detail
- Photoreal final-quality output
- Premium editorial and campaign visuals
- Wide aspect-ratio hero shots
GPT-Image 1.5 Strengths
- Strong prompt adherence
- High-fidelity detail
- Complex, detailed scenes
- Reliable, predictable output
Verdict
Flux Ultra 1.1 and GPT-Image 1.5 are both capable image models, but they win in different workflows. Reach for Flux Ultra 1.1 when you want premium photoreal detail — it excels at exceptional, ultra-high detail, photoreal final-quality output, and premium editorial and campaign visuals. GPT-Image 1.5 is the stronger pick when you need accurate prompt adherence — it excels at strong prompt adherence, high-fidelity detail, and complex, detailed scenes.
For plants & greenery, Flux Ultra 1.1 is usually the better starting point because it scores higher on realism. Most teams explore directions with GPT-Image 1.5 first to save credits, then move to Flux Ultra 1.1 for final, higher-resolution assets.
Frequently Asked Questions
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