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ChatGPT is OpenAI's conversational AI assistant — the tool millions of UK professionals use daily for writing, research, coding, and analysis. The free tier offers GPT-4o mini; ChatGPT Plus is $20/month for the full GPT-4o model, advanced data analysis, and image generation. It's available on web, desktop, and mobile. For businesses, OpenAI offers API access and enterprise plans with data controls. GDPR compliance is addressed via OpenAI's DPA and EU processing options. It's the fastest way to boost individual productivity across any UK team.