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Black Forest Labs - Flux 1.1 Pro Ultra

Black Forest Labs

Summary for Flux 1.1 Pro Ultra

Flux 1.1 Pro Ultra presents itself as a competent image generator, achieving an overall score of 7.16 across 99 evaluated prompts, placing it in the mid-tier compared to other models in the full leaderboard (currently 7th out of 11).

Key Findings:

  • 👍 Strengths: The model demonstrates strong capabilities in generating photorealistic images, particularly excelling in Architecture & Interiors (average score 8.4) and Hands & Anatomy (average score 8.3). It often produces images with high technical quality, good lighting, and accurate details when not hindered by other flaws.
  • 👎 Weaknesses: Its most significant weakness is text generation. Prompts involving text frequently result in gibberish or misspellings, leading to substantial score deductions (e.g., Facial Tattoos, Movie Poster, Tech Magazine, Singapore Hawker). Prompt adherence can also be inconsistent, sometimes missing key elements or misinterpreting styles (e.g., Toddler, Savanna, Library).
  • 🤖 Realism: Achieves high realism in many scenarios, especially structures and anatomy, but can sometimes produce overly smooth or artificial results (Toddler) or have minor anatomical flaws (Mona Lisa Android).
  • 🧩 Complexity: Handles complex scenes reasonably well (Medieval Battle, Market Scene), but struggles significantly with the Ultra Hard prompts (average score 4.8), often failing due to text issues or concept misinterpretations.

Quick Conclusion: Flux 1.1 Pro Ultra is a strong choice for photorealistic images without text, especially for architectural visualization and scenes requiring accurate anatomy. However, it should be avoided for prompts requiring legible text or highly specific stylistic nuances where adherence is critical.

General Analysis & Useful Insights for Flux 1.1 Pro Ultra

Flux 1.1 Pro Ultra shows a distinct performance profile, marked by high potential in realism and technical execution, often overshadowed by specific, recurring weaknesses.

Strengths:

  • Photorealism & Technical Quality: When it works well, Flux produces images with excellent photorealism, sharp details, and convincing lighting. This is particularly evident in the Architecture & Interiors category, with stunning examples like the Roman Bathhouse and the Moroccan Riad. Technical aspects like focus, depth of field, and texture rendering are often top-notch (e.g., Old Fisherman, Businesswoman).
  • Anatomy & Hands: The model demonstrates a strong grasp of human anatomy, especially hands – a common challenge for AI. Examples like the Handshake, High-five, and Runner showcase accurate and realistic depictions of limbs and interactions.
  • Complex Structures: It can render complex structures and scenes with impressive detail, such as the Medieval Battle or the Space Habitat, maintaining coherence across large compositions.

Weaknesses:

Overall Insight: Flux 1.1 Pro Ultra has a high ceiling for photorealistic output, particularly with inanimate objects, architecture, and standard anatomy. However, its unreliability with text and occasional failure to grasp core prompt concepts or specific styles make it less dependable for tasks requiring precise adherence or typography.

Best Model Analysis by Use Case / Category for Flux 1.1 Pro Ultra

Flux 1.1 Pro Ultra's performance varies significantly across different use cases and categories.

✅ Recommended Use Cases:

⚠️ Use Cases with Caution:

❌ Not Recommended Use Cases:

  • Anything Requiring Accurate Text: Poor Performance (Avg. Score in Text in Images: 6.6). The model's inability to consistently generate legible and correct text makes it unsuitable for logos with text, signs, posters, book covers, UI elements, or any image where typography is crucial. See numerous examples listed under weaknesses.
  • Ultra Hard Prompts: Poor Performance (Avg. Score: 4.8). The model struggles significantly with highly complex prompts that test multiple failure points simultaneously, especially text, subtle concepts, and precise adherence.
  • Prompts Requiring Specific, Nuanced Style Replication: While capable of general styles, it often fails to replicate exact artistic styles like Ghibli sub-genres (Kiki, Howl's Castle) or game styles (Pixel Art Cityscape).