Seedream 4.5 vs Flux Pro Ultra
ByteDance's 4K model vs Flux's 2K Ultra — high-resolution image generation compared.
Seedream 4.5 from ByteDance and Flux Pro Ultra from Black Forest Labs represent two different approaches to AI image generation. ByteDance's flagship model with stunning aesthetics and complex scene understanding. On the other side, ultra-high resolution (up to 2K) with enhanced photorealism and detail.
At 10 credits, Seedream 4.5 costs 10 credits less than Flux Pro Ultra (20 credits). The question is whether the extra cost of Flux Pro Ultra translates into meaningfully better results for your use case. For artistic scenes, complex compositions, high-resolution output, Seedream 4.5 is hard to beat at its price point. But if you need large-format prints, posters, cinematic stills, photorealistic output, Flux Pro Ultra may justify the premium.
Updated March 2026
Flux Pro Ultra costs 10 credits more per generation — that adds up fast. Start with Seedream 4.5 for most work. It handles artistic scenes, complex compositions, high-resolution output well. Save Flux Pro Ultra for when you specifically need large-format prints and the quality difference matters.
Seedream 4.5 vs Flux Pro Ultra: Visual Output
Both generated with the same prompt and seed 42. Click to view full size.
Seedream 4.5
Flux Pro UltraSeedream 4.5 vs Flux Pro Ultra: How They Compare
| Seedream 4.5 | Flux Pro Ultra | |
|---|---|---|
| Provider | ByteDance | Black Forest Labs |
| Released | Dec 2025 | Nov 2024 |
| Cost | 10 | 20 |
| Speed | Medium | Slower |
| Reference images | Up to 10 | Up to 1 |
| Editing |
Seedream 4.5 vs Flux Pro Ultra: Cost Comparison
Seedream 4.5 is 50% cheaper than Flux Pro Ultra. Here's how credits add up at scale.
| Volume | Seedream 4.5 | Flux Pro Ultra |
|---|---|---|
| 10 images | 100 | 200 |
| 50 images | 500 | 1,000 |
| 100 images | 1,000 | 2,000 |
Strengths & Weaknesses
Seedream 4.5
- + More affordable (10 vs 20 credits)
- + Artistic scenes
- + Supports 10 reference images
- + Built-in image editing
- + More resolution options
- - Higher price point relative to speed tier
Flux Pro Ultra
- + Large-format prints
- + Raw mode for unprocessed output
- + Reference image with strength control
- + Prompt enhancement
- + Up to 2K resolution
- - More expensive (20 vs 10 credits)
- - Slower generation
- - No built-in editing
Seedream 4.5 vs Flux Pro Ultra: Which to Pick?
On a tight budget
At 10 credits per image, Seedream 4.5 gives you more generations for your plan. Good enough quality for most everyday use.
Maximum quality matters
Flux Pro Ultra is worth the extra credits when the output needs to be perfect — portfolio pieces, client work, or final deliverables.
Character or style consistency
Seedream 4.5 supports 10 reference images to keep subjects, styles, and characters consistent across generations.
Editing existing images
Seedream 4.5's built-in editing lets you refine and modify images with prompt-driven changes instead of starting from scratch.
Seedream 4.5 vs Flux Pro Ultra: FAQ
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