Flux Ultra 1.1 vs Seedream 4.5
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 priorities: how convincingly it renders faces up close, and how controllable the result is when you need revisions. Flux Ultra 1.1 and Seedream 4.5 are both premium options priced at 16 credits per image, but they excel in slightly different portrait workflows.
This comparison focuses on close-up headshots and environmental portraits—skin texture, eyes, hair detail, natural lighting, background integration, and how reliably each model maintains a consistent subject across variations.
Portrait — Side-by-Side Results
Prompt
"Portrait photo of a mid-20s woman with shoulder-length wavy dark brown hair, minimal makeup, wearing an oversized oatmeal hoodie and black leggings, holding her phone slightly above eye level like an Instagram story selfie while glancing near the camera with a soft, “just woke up” smile. She’s in a small sunlit kitchen with a messy counter (coffee mug, fruit bowl, open laptop) and warm morning window light hitting one side of her face; shallow depth of field with creamy bokeh and an 85mm lens feel. Natural, candid UGC vibe—slightly imperfect framing, real-life texture, approachable expression."
Feature Comparison
| Feature | Flux Ultra 1.1 | Seedream 4.5 |
|---|---|---|
| Provider | Black Forest Labs | ByteDance |
| Subcategories | text-to-image | text-to-image, image-to-image |
| 1080p / 2k Mode | Yes | Yes |
| 4k Mode | No | No |
| NSFW Rating | Strict | Low |
| 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 | 16 credits |
Flux Ultra 1.1 Strengths
- Exceptional micro-detail for close-up headshots (skin texture, hair strands, fabric weave)
- Strong photorealistic rendering that suits editorial and commercial portrait aesthetics
- Crisp facial features and high perceived sharpness, especially in well-lit portrait setups
- Great for “final image” generation when you want maximum detail with minimal post-work
Seedream 4.5 Strengths
- Powerful image-to-image editing for portrait revisions (pose tweaks, wardrobe changes, background adjustments)
- Versatile portrait styling—from clean studio headshots to more stylized environmental looks
- High-resolution output that holds up well for crops and reframing around the face
- Efficient iteration when collaborating with stakeholders who request multiple small changes
Verdict
If your primary goal is premium, photoreal close-up portraits with standout detail right out of the gate, Flux Ultra 1.1 is typically the better fit—especially for polished headshots and beauty-style framing.
If your portrait workflow involves frequent refinements—keeping a strong base image and making controlled changes—Seedream 4.5 is the more practical choice thanks to its editing capabilities. With both models priced at 16 credits per image, the best value comes from matching the model to how you iterate: generate-to-final (Flux Ultra 1.1) vs generate-and-edit (Seedream 4.5).
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