Flux Pro Ultra vs Grok Imagine
Black Forest Labs' premium model vs xAI's photorealistic generator — which premium pick?
Flux Pro Ultra from Black Forest Labs and Grok Imagine from xAI represent two different approaches to AI image generation. Ultra-high resolution (up to 2K) with enhanced photorealism and detail. On the other side, xAI's flagship image model with exceptional realism and artistic range.
At 15 credits, Grok Imagine costs 5 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 photorealism, artistic range, unusual aspect ratios, Grok Imagine 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
Grok Imagine (15 credits) offers better value for everyday use, especially for photorealism. Flux Pro Ultra (20 credits) is worth the premium when you need large-format prints. Both are available on Melies — try each with a test prompt to see which fits your style.
Flux Pro Ultra vs Grok Imagine: Visual Output
Both generated with the same prompt and seed 42. Click to view full size.
Flux Pro Ultra
Grok ImagineFlux Pro Ultra vs Grok Imagine: How They Compare
| Flux Pro Ultra | Grok Imagine | |
|---|---|---|
| Provider | Black Forest Labs | xAI |
| Released | Nov 2024 | Jul 2025 |
| Cost | 20 | 15 |
| Speed | Slower | Medium |
| Reference images | Up to 1 | Up to 3 |
| Editing | ||
| WebP output |
Flux Pro Ultra vs Grok Imagine: Cost Comparison
Grok Imagine is 25% cheaper than Flux Pro Ultra. Here's how credits add up at scale.
| Volume | Flux Pro Ultra | Grok Imagine |
|---|---|---|
| 10 images | 200 | 150 |
| 50 images | 1,000 | 750 |
| 100 images | 2,000 | 1,500 |
Strengths & Weaknesses
Flux Pro Ultra
- + Large-format prints
- + More resolution options
- + Raw mode for unprocessed output
- + Reference image with strength control
- + Prompt enhancement
- - More expensive (20 vs 15 credits)
- - Slower generation
- - No built-in editing
Grok Imagine
- + More affordable (15 vs 20 credits)
- + Photorealism
- + Supports 3 reference images
- + Built-in image editing
- + WebP output for smaller file sizes
- - Higher price point relative to speed tier
Flux Pro Ultra vs Grok Imagine: Which to Pick?
On a tight budget
At 15 credits per image, Grok Imagine 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
Grok Imagine supports 3 reference images to keep subjects, styles, and characters consistent across generations.
Editing existing images
Grok Imagine's built-in editing lets you refine and modify images with prompt-driven changes instead of starting from scratch.
Flux Pro Ultra vs Grok Imagine: FAQ
Try Flux Pro Ultra & Grok Imagine
Compare Flux Pro Ultra, Grok Imagine, and 15+ AI image models side by side. Switch models with one click, same credits.
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