OpenAI ChatGPT

ChatGPT is an AI-powered assistant developed by OpenAI, based on a Large Language Model (LLM).
It understands natural language, can process text, code, images, and data, and delivers human-like responses.

Core idea: A flexible, learning-capable tool for information, creativity, automation, and analysis.

• GPT-1 (2018) – First prototype, 117M parameters

• GPT-2 (2019) – 1.5B parameters, longer texts, misuse debate

• GPT-3 (2020) – 175B parameters, versatile applications

• ChatGPT / GPT-3.5 (2022) – Optimized for dialogue, rapid adoption

• GPT-4 (2023) – Multimodality, extended context, better reasoning

• GPT-5 (2025) – “PhD-Level”, 272k token context, agent capabilities

• Chat window – Messenger-style, input text, files, images, or voice

• Sidebar – Organize, name, and search chat histories

• Projects – Combine multiple chats, files, and tasks within a shared context

• Custom Instructions – Persistent settings for tone, language, and background info

• Memory – Remembers your preferences across sessions

• Reasoning Mode – “Think longer” option for more precise, complex answers

• Multimodality – Analyze and interpret images

Free – $0, GPT-5 limited, basic features
Plus – approx. $20/month, GPT-5 with higher limits, plugins, projects
Pro – approx. $200/month, GPT-5 Pro unlimited, Deep Research, Agent Mode
Enterprise/Edu – custom pricing, GPT-5 Pro, secure data processing, team features

Data security note: Only Enterprise/Edu guarantees that no content is used for model training.

• 272,000 token context – handle huge documents and long chat histories without losing context

• Expanded multimodality – text, image, prepared for video processing

• Faster & more efficient – fewer tokens, fewer tool calls

• More accurate – hallucination rate greatly reduced (1.6% in health queries)

• Agent capabilities – can plan and execute workflows autonomously

• Safe Completions – safe yet informative answers for sensitive topics

• Custom GPTs – Create specialized assistants with unique knowledge

• Plugins – Connect to external services like Wolfram Alpha, Expedia, internal systems

• Deep Research – Multi-step web research with sources

• DALL·E – Generate images from text

• Data analysis – Process tables, create charts, identify trends

• Voice Chat – Real-time conversations with the AI

• File uploads – Analyze PDFs, spreadsheets, presentations

• Projects – Persistent context for complex tasks

• Personal accounts (Free, Plus, Pro): Data may be used for model training (opt-out available)

• Enterprise/Edu: Content is not used for training

• Content filters: Protection against illegal or harmful content

• Self-verification: GPT-5 clearly indicates when information is missing instead of guessing

• Precise instructions – Clearly define role, goal, and format

• Iterative workflow – Refine results step by step

• Use multimodality – Combine text, images, and files

• Leverage projects – Group related material and context

• Create custom GPTs – For recurring processes

• Always review outputs – AI complements but does not replace experts

ChatGPT has evolved from a simple chatbot into a powerful work platform.
With GPT-5, it becomes an active AI agent capable of autonomously planning and executing complex tasks.
For both companies and individual users, it opens new dimensions in productivity, analysis, creativity, and automation – provided it is used securely and purposefully.