Top 7 Closed Source Image Generation Models in 2025

There was a time when creating images required hours of effort, creativity, and meticulous planning. Today, in 2025, the process has been totally changed. With the increasing popularity of image generation models, and with billions of users using them, creating images with stunning visuals simply by describing their ideas is fascinating as well as time-saving. And the best, those with no design experience can also make maximum use of it.

But are all models created equal? Yes, there are top open source image generation models that dominate the landscape and help users produce impressive visuals, but what about closed-source AI Image Generator models? Do they stand out for their cutting-edge technology, unmatched reliability, and superior quality?

If you are curious to know these things, stick to this blog till the end. In this blog, we explore the top 7 closed-source image generation models redefining creativity and innovation.

What are Closed Source Image Generation Models?

Closed-source image generation models are AI tools that create images from text or other inputs, but their technology is not shared with the public. Unlike open source Generative AI models, their code and methods are kept private by the companies that develop them.

These models are known for their advanced features, reliable performance, and high-quality results, making them ideal for professional and creative use.

Top Closed Source Image Generation Models

Flawless Text Model by Pixazo: Generating Perfect Text in Images

Summary of Features

Benefits

1. Clear, Readable Text – Unlike traditional AI image generation models, the Flawless Text Model ensures that the text in your images is clear and readable, even at high resolutions.
2. Saves Time in Editing – By automatically fixing text distortions, it reduces the time you’d spend correcting text in AI-generated images.
3. Improves Professional Quality – Ideal for businesses and content creators who need to ensure that the text in their visuals is perfect for marketing, social media, and other digital platforms.
4. High-Quality, Seamless Integration – The text blends naturally with the overall design, making the image look polished and professional.
5. User-Friendly for Beginners – No need to be an expert in graphic design—this tool is simple enough for anyone to use and get professional results.

Limitations

1. Text May Not Be Fully Customizable – While the model ensures accuracy, the level of text customization (like font style or size) might be limited compared to traditional design tools.
2. Relies on Clear Prompts – As with most text-to-image generation models AI, the accuracy of the text generation depends on how well the prompt is written.
3. Requires Subscription for Full Features – To access the full capabilities of the model, a subscription to Pixazo’s premium plan may be required, especially for higher resolution images.
4. Limited Control Over Fine Design Details – While the text is flawless, other aspects of the design (such as complex visuals) may still need manual adjustments.

Best For

• Content Creators – Perfect for bloggers, marketers, and influencers who regularly use AI to generate engaging visuals with text.
• Businesses – Great for creating polished marketing materials, such as advertisements, social media posts, and website images.
• Designers – Ideal for designers who need quick, high-quality images with accurate text without spending too much time on manual adjustments.
• Anyone Looking for Effortless Image Creationand Integration– If you're a beginner who needs professional-looking visuals with minimal effort, as well as looking to use the model for their use, Flawless Text API offers a simple and effective solution.

How to Get Started

1. Sign Up for Pixazo – Create an account on Pixazo to access the AI Image Generator and its Flawless Text Model feature.
2. Land on AI Playground – Once signed up, go to AI Playground and choose model Flawless Text. 
3. Enter Your Text Prompt – Provide a clear and detailed text prompt describing the image you want to generate, including any text you need to appear in the image.
4. Generate & Customize – Once your image is created, the Flawless Text Model will automatically incorporate the text into the image seamlessly.
5. Download & Use – After making any final tweaks, download your image and use it for your project, campaign, or social media.

Suggested Read: How to Create Your Own AI Image Generator

DALL·E 3: AI Image Generator

Summary of Features

Benefits

1. Easy to Use – You don’t need any special skills. Just type out your idea, and DALL·E 3 turns it into an image.
2. Highly Creative – It can create anything from a unicorn in space to a realistic portrait of a person. Your imagination is the limit.
3. High Quality – The images look polished and clear, making them perfect for use in your projects, whether for social media, websites, or presentations.
4. Flexible Styles – From realistic photos to cartoonish or surreal art, DALL·E 3 lets you pick the style that best fits your needs.
5. Time-Saving – No need to search for stock photos or hire a designer. You get custom images in minutes, saving you time and effort.

Limitations

1. Limited Customization – While you can create and refine images, you can’t change the way DALL·E 3 works under the hood.
2. Requires Internet – Since it’s an online tool, you need a stable internet connection to use it.
3. May Not Always Be Perfect – Sometimes, the image might not turn out exactly as you imagined. You may need to tweak your description or try again.
4. Cost – Some advanced features might require a subscription, which can be costly for regular use.

Best For

• Artists & Designers – If you need to quickly generate visual concepts or explore new ideas, DALL·E 3 is a great tool.
• Marketers & Content Creators – Perfect for generating eye-catching visuals for websites, social media, and advertisements.
• Businesses – Create images for branding, product design, and promotional materials without the need for a full-time designer.
• Anyone Looking for Visuals – Whether you’re a beginner or experienced user, if you need high-quality images fast, this is the tool to use.

How to Get Started

1. Sign Up – Go to the OpenAI website and create an account. It’s quick and easy.
2. Explore the Interface – Once you’re signed in, take a look around. It’s simple to navigate, so don’t worry about feeling lost.
3. Start Creating – Type a clear description of what you want. For example, “a cat wearing a spacesuit floating in space.” The clearer your description, the better the result.
4. Edit the Image – If you want to make changes to your image, use the inpainting tool to describe what you want fixed or improved.
5. Download & Use – When you’re happy with your image, just download it and use it for your project!

Suggested Read: How AI DALL.E is Revolutionizing the Art of Image Generation?

MidJourney: AI Image Generator

Summary of Features

Benefits

1. Artistic Quality – MidJourney is perfect for creating beautiful, artistic images that have a hand-crafted feel.
2. Fast & Efficient – Generates high-quality images in a short amount of time, making it great for quick creative projects.
3. Customizable Styles – You can adjust your image's tone, color, and artistic style to fit your needs.
4. Great for Concept Art – Ideal for designing characters, scenes, or environments in movies, games, and more.
5. Collaborative Community – You can share ideas and get inspiration from a large group of creative users, making it easy to discover new possibilities.

Limitations

1. Limited Control Over Fine Details – While it offers customization, users might not be able to fine-tune every aspect of the image.
2. Cost – Accessing the full set of features requires a paid subscription, which might be expensive for casual users.
3. Not Always Realistic – MidJourney focuses more on creativity and style, which means its images might not always look photorealistic or practical.
4. Complex User Interface – New users may find the platform's interface slightly tricky to navigate, especially with the need to use a bot interface in Discord.

Best For

• Artists & Illustrators – Ideal for generating artistic, visually captivating images.
• Game Developers & Filmmakers – Perfect for creating concept art and visualizing characters or scenes.
• Content Creators & Marketers – Great for crafting eye-catching visuals for websites, social media, and ads.
• Creative Professionals – If you're looking to experiment with unique art styles, MidJourney offers endless possibilities.

How to Get Started

1. Sign Up for Discord – MidJourney operates through a Discord bot, so you’ll need a Discord account to get started.
2. Join the MidJourney Server – Once on Discord, join the official MidJourney server where the bot is available.
3. Enter Your Prompt – Type your prompt into the appropriate channel, describing the image you want to create.
4. Adjust Settings (Optional) – You can customize the output by adjusting style and detail settings in your prompt.
5. Download & Share – Once your image is generated, download it or share it with others in the community for feedback.

Suggested Read: How to Use Midjourney to create AI-generated Images

Leonardo.AI: AI Image Generator for Creative Professionals

Summary of Features

Benefits

1. Perfect for Game & Asset Design – Leonardo.AI is optimized for generating game assets like characters, environments, and 3D models, making it ideal for developers.
2. Versatile Image Styles – Whether you need photorealistic renders, stylized art, or something in-between, this text-to-image generation model offers complete flexibility.
3. Fast Output – Great for creative professionals who need to generate a large number of images in a short time.
4. Advanced Tools for Professionals – Offers tools that help with detailed design work, making it suitable for designers, illustrators, and digital artists.
5. Community Collaboration – The platform fosters creativity and idea-sharing, where you can learn from others and exchange tips or assets.

Limitations

1. Closed-Source Model – Like many advanced closed-source image generation models, the full version of Leonardo.AI may require a subscription or commercial access.
2. High Demand on Resources – For the best performance, especially with large or complex images, powerful hardware or cloud-based services may be needed.
3. Learning Curve for Beginners – While designed for professionals, beginners might find the platform's features a bit overwhelming at first.
4. Limited Control on Fine Details – Although it’s highly customizable, fine-tuning every tiny detail might be difficult compared to traditional design tools.

Best For

• Game Developers & 3D Artists – Perfect for creating characters, environments, and game-ready assets with ease.
• Professional Designers & Illustrators – Ideal for creating detailed concept art, visual assets, and digital illustrations.
• Marketing & Content Teams – Excellent for producing promotional visuals or images for digital campaigns, websites, and more.
• Creative Professionals – Whether you’re designing a world for a game or a product line, Leonardo.AI offers the tools to bring your ideas to life.

How to Get Started

1. Sign Up for Leonardo.AI – Create an account on the official platform to access its tools.
2. Explore the Tools – Once you're logged in, take a look at the options available for text-to-image generation and asset design.
3. Write Your Prompt – Enter a clear description of the image you want to generate. The more specific you are, the better the results will be.
4. Generate & Customize – Generate your image and fine-tune it using the platform’s tools for style and detail adjustments.
5. Download & Use – Once satisfied, download the image or asset for use in your creative projects.

Suggested Read:

Imagen (Google Research): AI-Powered Image Generation

Summary of Features

Benefits

1. Photorealistic Output – Imagen is known for creating photorealistic images, which is ideal for professional industries that require high-quality visual assets.
2. State-of-the-Art AI – Leveraging Google Research's advanced AI architecture, Imagen produces highly accurate results that are hard to distinguish from actual photographs.
3. High-Resolution Images – With the ability to generate high-resolution images, Imagen is perfect for large-scale printing, advertisements, and digital media projects.
4. Ease of Use – Despite its advanced technology, Imagen offers a user-friendly interface that makes it easy for non-experts to create professional-grade images.
5. Versatility in Applications – Whether for marketing, entertainment, or design, Imagen is highly adaptable and can be used across various fields that require detailed visuals.

Limitations

1. Limited Public Access – Currently, Imagen is not widely available to the public, which means only a select group of researchers and collaborators have full access to the model.
2. Closed-Source Model – While its capabilities are impressive, it operates as a closed-source image generation model, meaning the public cannot fully modify or control the tool.
3. Dependence on Detailed Prompts – As with most image generation models AI, the quality of the output depends heavily on the clarity and specificity of the input prompts.
4. Hardware Requirements – To run at full capacity, especially for high-resolution image generation, powerful hardware or cloud-based services are necessary, which may be a barrier for some users.

Best For

• Professionals in Creative Industries – Designers, illustrators, and content creators who need realistic visuals for marketing, advertising, and branding.
• Researchers & Developers – Those exploring the future of AI-powered creativity can use Imagen for innovative applications in media and design.
• Businesses Needing High-Quality Visuals – Ideal for companies that require high-resolution, realistic imagery for digital campaigns, websites, and other marketing assets.
• AI Enthusiasts & Developers – As a closed-source image generation model, it’s great for developers and researchers interested in the cutting edge of AI but may require permission for access.

How to Get Started

1. Access the Model – Currently, Imagen is not widely available for direct use, but you can follow updates from Google Research for potential public access or partnerships.
2. Understand the Capabilities – Once you gain access, familiarize yourself with the model’s capabilities, particularly its focus on realism and high-resolution generation.
3. Write Your Prompt – Enter a detailed and specific text description of the image you wish to generate. The clearer your prompt, the more accurate the result.
4. Generate & Refine – Use the AI’s tools to tweak and refine your generated image until it meets your needs.
5. Download & Use – After creating your image, download it for your creative, commercial, or professional project.

Runway Gen-2: Pioneering Creativity in AI Image Generation

Summary of Features

Benefits

1. Effortless Creativity – Runway Gen-2 allows users to generate stunning visuals simply by writing text prompts.
2. Time-Saving Tool – With its real-time output, creators can bring ideas to life faster than ever.
3. Professional Results – Produces high-quality images that meet the standards of professional projects.
4. Accessible to Everyone – Its cloud-based platform and intuitive design make it perfect for users of all skill levels.
5. Multi-Modal Flexibility – Beyond just images, it combines text, visuals, and videos for dynamic creative outputs.

Limitations

1. Subscription-Based Access – Some features may require a paid plan for full functionality.
2. Limited Customization – While user-friendly, fine-tuning complex designs might need additional manual work.
3. Cloud Dependence – Requires a stable internet connection for smooth operation.
4. Learning Curve for Advanced Features – Beginners may need time to explore and fully utilize all capabilities.

Best For

• Content Creators – Perfect for social media visuals, marketing campaigns, and creative content.
• Businesses – Ideal for creating professional-grade images and branding materials.
• Design Enthusiasts – Great for exploring AI’s creative possibilities without needing advanced design skills.
• Filmmakers & Animators – Leverages multi-modal capabilities for visual storytelling.

How to Get Started

1. Sign Up on Runway – Create an account on the Runway platform to access Gen-2.
2. Choose Your Input – Start with a text prompt, image, or video, depending on your creative needs.
3. Generate Your Visuals – Let Gen-2 transform your ideas into high-quality visuals in real time.
4. Customize and Download – Make any necessary edits and download your finished creation.
5. Share Your Masterpiece – Use your AI-generated visuals for projects, social media, or business campaigns.

Adobe Firefly: Creativity Reimagined with AI

Summary of Features

Suggested Read: 10+ Best AI Text to Image Generators in 2025

Benefits

1. Seamless Workflow – Firefly integrates directly with Adobe Creative Cloud, making it an excellent choice for designers already familiar with Adobe tools.
2. Effortless Creativity – Generate high-quality visuals in seconds without needing advanced design skills.
3. Customizable Styles – Add unique touches with artistic effects and styles to personalize your images.
4. Professional Quality – Firefly’s advanced technology ensures top-notch results suitable for industries like marketing, branding, and design.
5. Saves Time – Firefly simplifies tasks like image editing, filling, and generating, reducing the time needed for complex projects.

Limitations

1. Subscription-Based Access – Firefly requires an Adobe Creative Cloud subscription, which can be costly for some users.
2. Internet Dependency – As a cloud-based tool, Firefly needs a stable internet connection for smooth operation.
3. Text Generation Challenges – Like many AI image generation models, Firefly may face limitations in generating flawless text within visuals.
4. Learning Curve for Advanced Features – While beginner-friendly, mastering its full capabilities may take time for new users.

Best For

• Professional Designers – Ideal for those who rely on Adobe tools for high-quality projects.
• Businesses – Great for creating branding materials, marketing campaigns, and promotional content.
• Content Creators – Perfect for crafting social media visuals, YouTube thumbnails, and other creative outputs.
• Beginners – Its simple interface allows anyone to create visually stunning designs.

How to Get Started

1. Subscribe to Adobe Creative Cloud – Choose a plan that suits your needs and gain access to Firefly.
2. Launch Adobe Firefly – Log in to your Adobe account and open the Firefly tool.
3. Enter Your Prompt – Type a description or upload an image to start generating visuals.
4. Enhance and Customize – Use Firefly’s tools, like generative fill and style effects, to refine your creation.
5. Download and Use – Save your finished design and use it in your projects, campaigns, or personal work.

Suggested Read: Best Open Source Lip Sync Models

Summing Up

In the end, we can only comprehend after going through the models of the best AI image generators with closed source are preferred where cutting-edge technology, unmatched reliability, and superior quality matter. While open-source models dominate the AI landscape with accessibility and flexibility. These proprietary tools deliver precision and professionalism, setting them apart for users who demand the best results.

Say hello to the Flux AI Image Generator, a next-gen image tool that uses artificial intelligence to generate breathtaking visuals from text descriptions. Ideal for designers and creatives looking to streamline their workflow.

Closed-source models aren’t just tools—they’re creative powerhouses designed to push the boundaries of innovation, making them the go-to choice for those who value excellence in their visuals.