Transformer Models

What is Transformer Models?

A transformer is the type of AI architecture that powers most modern generation models: it works by letting every part of the input pay attention to every other part at the same time, which is why AI can understand complex, nuanced prompts rather than reading them word by word.

At a glance

Also known as
Attention modelSelf-attention architectureDiffusion transformerDiT model
Used for
Processing text prompts to build rich contextual representations that condition generationGenerating images and video through diffusion transformer architecturesCapturing long-range relationships and global coherence in generated contentUnderpinning most state-of-the-art image, video, and language AI systems
Key features
Self-attention processes all input elements simultaneously, not sequentiallyCaptures long-range dependencies that sequential architectures missScales effectively to very large parameter counts, improving with model sizeFoundation of leading generation models including sora, FLUX, and most major platforms

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How it compares

How it compares

Compared with related concepts

Transformer models are most directly compared to the recurrent neural network architectures they replaced for sequence processing tasks. Recurrent networks ( particularly LSTMs and GRUs ) processed sequences step by step, maintaining a hidden state that carried information forward but struggled to retain long-range dependencies across long sequences. Transformers abandoned this sequential processing in favour of parallel self-attention across the full sequence, capturing relationships between all elements simultaneously. This made transformers dramatically better at long-range coherence and significantly more parallelisable during training, enabling the very large model scales that define modern AI capability. Transformers are also distinct from convolutional neural networks, which process spatial data through local receptive fields that grow larger through stacking: useful for many computer vision tasks but less effective than transformers for capturing global spatial relationships across an entire image.

Think of it like…

Imagine a committee of editors reviewing a manuscript. A recurrent architecture is like a single editor reading the text from beginning to end, trying to remember earlier passages as they reach later ones: by the time they reach the final chapter, the opening details have faded from immediate memory. A transformer is like every editor reading every paragraph simultaneously, each one asking the others how each passage relates to their own section. The result is a much richer, more consistent understanding of how all the parts connect to one another, because no part of the text is processed in isolation from any other. This is what self-attention does: it allows every element to directly consult every other element in forming its representation.

Pro tip

Knowing that modern generation models are transformer-based helps calibrate how to write prompts. Because self-attention allows the model to relate all parts of a prompt to one another, a well-structured prompt that clearly specifies the relationships between its elements: how the subject relates to the environment, how the lighting relates to the mood: will be processed more coherently than a list of disconnected attributes. Prompts written as coherent descriptions that express how elements work together tend to produce more globally coherent outputs than prompts that simply enumerate desired characteristics, precisely because the transformer's attention mechanism is built to understand relational structure.

Types and variations

  • Transformer architectures have evolved into several distinct forms within the AI generation landscape.
  • Encoder-only transformers, such as BERT and CLIP, process input sequences to build rich representations used for understanding and retrieval tasks.
  • Decoder-only transformers, including GPT-family language models, generate sequences auto-regressively by predicting each next token from all previous ones.
  • Encoder-decoder transformers combine both components, processing an input sequence and generating an output sequence, which was the original architecture described in the foundational paper.
  • For image and video generation, the most significant recent development is the diffusion transformer, which replaces the convolutional U-Net backbone of earlier diffusion models with a transformer that applies self-attention to spatial image patches or video frame tokens.
  • This architecture enables better global coherence and more scalable training than convolutional approaches and is now the dominant design for frontier image and video generation models.

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Common use cases

  • Transformer models underpin virtually all contemporary AI generation and language tools.
  • Text-to-image and text-to-video generation systems use transformer-based text encoders to process prompts and, increasingly, transformer-based generation backbones to produce visual content.
  • Large language models used for creative writing, scripting, and planning are built entirely on transformer architectures.
  • Multimodal models that accept both text and image inputs use transformer architectures to process tokens from both modalities through unified attention mechanisms.
  • For AI video production workflows on Morphic, every model in the supported catalogue ( Runway Gen-4, Kling, Sora, Veo, and others ) is built on transformer-based foundations, meaning the prompt sensitivity, global coherence, and contextual responsiveness that characterise modern generation quality all derive directly from the transformer architecture.

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FAQs

What is a transformer model in AI?
A transformer is a neural network architecture that processes sequences of data ( text, image patches, video frames ) using a mechanism called self-attention, which computes relationships between all elements in the input simultaneously rather than sequentially. Originally developed for language tasks, transformers have become the dominant architecture across AI generation, underpinning most state-of-the-art text-to-image and text-to-video models. Their ability to capture long-range dependencies, scale to large parameter counts, and process complex relational prompts coherently has made them the foundation of modern AI generation capability.
What is self-attention and why does it matter?
Self-attention is the core mechanism of transformer models. For each element in an input sequence, the model computes attention weights expressing how much that element should attend to every other element when building its representation. This allows the model to understand relationships between all parts of the input simultaneously: how words at the beginning of a prompt relate to words at the end, or how the lighting in one region of an image relates to the scene composition globally. The ability to capture these long-range relationships is why transformer-based generation models handle complex, multi-element prompts and produce globally coherent outputs more effectively than architectures that process information locally.
What is a diffusion transformer and how is it different from earlier generation architectures?
A diffusion transformer, or DiT model, applies the transformer's self-attention mechanism to the generation process itself: treating image patches or video tokens as the sequence over which attention operates: rather than using a convolutional U-Net backbone for generation with only a transformer text encoder on the input side. This produces better global coherence across generated content because every spatial region attends to every other region throughout the generation process, enabling more consistent lighting, structure, and detail across complex scenes. Sora and FLUX are prominent examples of diffusion transformer architectures that represent the current frontier of generation quality.
Why do larger transformer models generally produce better outputs?
Transformer performance scales with parameter count in a well-documented relationship: larger models, trained on more data with more parameters, consistently produce higher-quality, more coherent, and more contextually sensitive outputs. This is because more parameters allow the model to learn and represent more complex relationships in both its training data and its inputs. The self-attention mechanism's capacity to model relationships between all input elements means that additional parameters translate into more nuanced understanding of how prompt elements relate to one another, producing outputs that better reflect the full complexity of the specified creative intent.
How does understanding transformers help me write better prompts?
Because transformer models process all parts of a prompt simultaneously through self-attention, they are built to understand relational structure: how one element of a prompt relates to others. This means prompts written as coherent descriptions that express relationships between elements tend to produce more globally coherent outputs than prompts that simply list attributes. Specifying how the subject relates to the environment, how the lighting quality connects to the mood, and how compositional elements work together gives the model's attention mechanism richer relational information to work with, producing more integrated and coherent generations.
Are all modern AI generation models based on transformers?
The dominant trend is strongly toward transformer-based architectures for frontier generation models, though the field continues to evolve. For text-to-image and text-to-video generation, transformer-based text encoders are nearly universal, and diffusion transformer architectures have become the preferred design for models at the leading edge of quality. Some models use hybrid architectures that combine transformer components with convolutional elements. Alternative architectures, including state-space models, are being actively researched as potentially more efficient alternatives, but transformers currently define the baseline architecture for most production-quality generation systems.
What is the relationship between transformer models and CLIP?
CLIP is a transformer-based model trained by OpenAI to align text and image representations, learning to associate textual descriptions with visual content through contrastive training on image-text pairs. Many text-to-image generation systems use CLIP's text encoder ( or similar transformer-based text encoders ) to process prompts and build the textual representation that conditions the generation process. CLIP is therefore an important component in the pipeline of many generation models rather than a generation model itself: it translates prompt language into a form the generation system can condition on, using its transformer architecture to build rich, contextually aware text representations.
How do transformers handle video generation differently from image generation?
Video generation extends the transformer's token sequence from spatial image patches to spatio-temporal tokens that represent both spatial position and temporal location within a sequence of frames. Rather than attending only to spatial relationships within a single frame, a video generation transformer attends to relationships across both space and time, enabling consistent motion, coherent subject appearance across frames, and global scene continuity over the duration of the clip. This temporal attention is what allows leading video models to maintain character appearance, lighting consistency, and motion coherence across multiple seconds of generated footage: capabilities that emerge from the transformer architecture's ability to model relationships across the full spatio-temporal extent of the generation.
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