Flux Ultra 1.1 vs Seedream 4.5
Eye-catching and expressive thumbnail imagery — see how these models compare with real AI-generated outputs.
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Choosing the right image model can make or break a YouTube thumbnail—especially when you need bold expressions, clean subjects, and instantly readable visuals at small sizes. Flux Ultra 1.1 and Seedream 4.5 are both premium options inside Influencer Studio, each priced at 16 credits per image.
This comparison focuses on what matters for click-worthy thumbnails: photorealistic faces, high-impact composition, style control, and how easily you can iterate toward a consistent channel look.
YouTube Thumbnail — Side-by-Side Results
Prompt
"Close-up YouTube-thumbnail style selfie of a 20s influencer with shoulder-length wavy brown hair, wearing a bright oversized hoodie and minimal makeup, holding an iced coffee up to the camera with wide shocked eyes and an open “NO WAY” mouth, looking directly at the phone lens. Candid morning moment in a busy neighborhood café (menu board and people softly blurred behind), bold colorful background accents, dynamic slightly tilted framing, high-contrast natural window light with subtle phone-camera sharpening."
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 photorealism for face-forward thumbnails (skin texture, lighting, and depth feel premium)
- Ultra-high detail that holds up after cropping and adding large headline text
- Strong subject separation and cinematic lighting for “hero” compositions that pop in feeds
- Great for realistic product, lifestyle, and creator-portrait thumbnail concepts
Seedream 4.5 Strengths
- Image-to-image editing for fast thumbnail iteration (refine poses, swap backgrounds, adjust style while keeping the concept)
- Versatile styles—useful for switching between realistic, semi-stylized, and bold graphic looks per series
- High-resolution output well-suited to tight crops and layout experimentation
- Practical for maintaining channel consistency by evolving a base image across multiple videos
Verdict
If your priority is premium, photorealistic “stop-the-scroll” thumbnails—especially expressive portraits and cinematic realism—Flux Ultra 1.1 is the stronger pick. It excels when the thumbnail’s impact relies on lifelike detail and polished lighting.
If you iterate heavily or want to refine an existing thumbnail concept without starting over, Seedream 4.5 is often the more efficient choice thanks to its image-to-image editing and style versatility. Since both cost 16 credits per image, the best value depends on whether you need maximum realism (Flux Ultra 1.1) or faster editing-driven workflows (Seedream 4.5).
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