Users interact with ChatGPT through a conversational interface. Each session consists of a thread of messages where the model responds to prompts in context. The model processes the full conversation history within each session to maintain coherence. Users can adjust the behaviour through custom instructions, system prompts (in API usage), or by selecting different model versions. File uploads, image analysis, and web search are available on higher-tier plans.
ChatGPT
ChatGPT is a conversational AI assistant developed by OpenAI, first released publicly in November 2022. It is built on OpenAI's GPT series of large language models and is designed to understand and generate human-like text across a wide range of topics and formats.
The tool is used across professional, creative, and educational contexts — from drafting written content and summarising documents to writing code and answering research questions. It operates through a simple chat interface, making it accessible to users without technical backgrounds.
ChatGPT occupies a broad-purpose position in the AI assistant market. It competes with other frontier models such as Claude and Google Gemini, though it remains one of the most widely recognised AI tools globally due to its early market entry and large user base.
Best For
- Content writers and marketers
- Software developers
- Students and researchers
- Business analysts
- Product managers drafting documentation
How It Works
Key Features
Core Capabilities
- Conversational text generation
- Multi-turn context retention
- Code writing and debugging
- Summarisation and rewriting
- Custom instructions and memory
Advanced Capabilities
- Image input analysis (GPT-4o)
- File uploads and data analysis
- Web browsing
- Plugin and tool integrations
- API access for developers
Pros & Cons
Pros
- Extremely broad knowledge base
- Strong at following complex multi-step instructions
- Large ecosystem of integrations and third-party tools
- Regular model updates from OpenAI
- Available via API for custom applications
Cons
- Can produce plausible-sounding but incorrect information
- Free tier has usage and model limitations
- No persistent project memory across sessions by default (without Memory feature)
- Output quality varies with prompt quality
Pricing
ChatGPT offers a free tier with access to a base model version. Paid plans provide access to more capable models, higher message limits, file analysis, and image generation. OpenAI also offers an API for developers, billed by token volume. Enterprise plans are available for organisations requiring custom configurations and data privacy guarantees.
How It Compares
Compared to Claude (Anthropic), ChatGPT tends to have a broader feature surface including image generation and plugin support, while Claude is often noted for longer context handling and more cautious output. Against Google Gemini, ChatGPT has a more established third-party ecosystem, though Gemini is more deeply integrated with Google Workspace. Perplexity targets research and citation use cases more specifically, whereas ChatGPT remains a general-purpose assistant.