Flux Ultra 1.1 vs GPT-Image 1.5
Close-up headshots and environmental portraits — see how these models compare with real AI-generated outputs.
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Choosing the right model for portrait work on Influencer Studio often comes down to two things: how convincingly it renders a face up close, and how reliably it follows your direction for styling, lighting, and framing. Flux Ultra 1.1 and GPT-Image 1.5 both target high-quality results, but they excel in different portrait scenarios.
This comparison focuses on close-up headshots and environmental portraits—evaluating skin texture, eyes and hair detail, natural lighting, background separation (bokeh/DOF), consistency of facial features, and how much control you get per credit spent.
Portrait — Side-by-Side Results
Prompt
"Portrait photo of a mid-20s woman with shoulder-length wavy dark brown hair, dewy minimal makeup, wearing an oversized cream hoodie and black leggings, holding her phone slightly above eye level like she’s filming an Instagram Story and glancing near the camera with a relaxed half-smile. She’s standing by a sunny kitchen window with a messy countertop (coffee mug, fruit bowl, laptop) and soft morning natural light spilling across her face; shallow depth of field with warm bokeh in the background, 85mm lens feel, authentic candid UGC vibe."
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 micro-detail for close-up headshots (skin texture, eyelashes, hair strands) with a premium photoreal feel
- Strong natural lighting and tonal depth, producing polished portrait finishes with minimal prompt complexity
- Crisp subject separation in portraits (clean edges, convincing depth-of-field and bokeh in many setups)
- Reliable premium-quality output at a predictable flat cost (16 credits per image)
GPT-Image 1.5 Strengths
- Stronger prompt adherence for portrait direction (pose, lens feel, lighting setup, wardrobe, expression, and composition)
- Versatile portrait output across styles—from clean studio headshots to environmental portraits with detailed context
- Flexible pricing tiers (8/16/32 credits) to match draft vs final portrait needs
- Good handling of complex scene instructions around the subject (location cues, props, background narrative) while keeping the face central
Verdict
If your priority is premium photorealism and ultra-fine facial detail for close-up headshots, Flux Ultra 1.1 is the go-to—especially when you want consistently “high-end” portrait polish at a fixed 16-credit cost.
If you need tighter control over portrait specifics (exact styling, framing, and environmental storytelling) or want a cheaper draft pass before committing to a final, GPT-Image 1.5 is the more flexible choice thanks to strong prompt adherence and tiered pricing.
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