# GPT (Generative Pre-trained Transformer)

> A series of large language models developed by OpenAI that power ChatGPT and many AI applications worldwide.

Category: Architecture

Source: https://chipp.ai/ai/glossary/gpt

GPT (Generative Pre-trained Transformer) is a series of large language models developed by OpenAI. The name describes the architecture: Generative (creates new content), Pre-trained (trained on massive text data before deployment), Transformer (uses the transformer neural network architecture).

The GPT series evolution: GPT-1 (2018, 117M parameters — proof of concept), GPT-2 (2019, 1.5B parameters — surprisingly coherent text generation), GPT-3 (2020, 175B parameters — breakthrough in few-shot learning), GPT-3.5 (2022, powered ChatGPT's launch), GPT-4 (2023, multimodal, significantly more capable), GPT-4o (2024, faster, cheaper, native multimodal), and o1/o3 (2024-2025, reasoning-focused models).

GPT models are the most widely used foundation models in the world. They power ChatGPT, Microsoft Copilot, thousands of applications, and are available through OpenAI's API for developers and platforms to integrate.

For AI agent builders, GPT models offer: broad general knowledge, strong instruction following, tool use capabilities, multilingual proficiency, and multimodal understanding (text, images, audio). On platforms like Chipp, GPT models are available alongside models from Anthropic (Claude), Google (Gemini), and others.

## Related Terms

- [Transformer](https://chipp.ai/ai/glossary/transformer.md): The neural network architecture that powers modern AI language models, using self-attention mechanisms to process sequences of data in parallel.
- [Large Language Model (LLM)](https://chipp.ai/ai/glossary/large-language-model.md): A neural network trained on massive text datasets that can understand and generate human-like language, powering modern AI assistants and agents.
- [Foundation Model](https://chipp.ai/ai/glossary/foundation-model.md): Large AI models trained on broad, diverse data that serve as the base for many different downstream applications and tasks.
- [Generative AI](https://chipp.ai/ai/glossary/generative-ai.md): AI systems that can create new content — text, images, audio, video, or code — rather than just analyzing or classifying existing data.

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This term is part of the [Chipp AI Glossary](https://chipp.ai/ai/glossary), a reference of AI concepts written for builders and businesses.

Build AI agents with no code at https://chipp.ai.