ChatGPT is a conversational AI assistant developed by OpenAI. It uses large language models — most recently the GPT-4o series — to understand and generate human-like text. Users can ask it questions, request written content, analyse documents, write and debug code, summarise information, translate languages, and much more, all through a simple chat interface.
Originally launched in November 2022, ChatGPT rapidly became the fastest consumer product to reach 100 million users and remains the world's most recognised AI tool. OpenAI continually updates the underlying model, and the platform now supports image generation via DALL·E, voice conversations, file uploads, browsing the web, and custom GPT agents.
| Plan | Price | Key features |
|---|---|---|
| Free | £0/month | GPT-4o mini, limited GPT-4o messages, basic tools |
| Plus | £16/month | GPT-4o, DALL·E image gen, voice, browsing, file uploads |
| Pro | £160/month | Unlimited GPT-4o, o1 pro mode, extended thinking |
| Team | £22/user/month | Plus features + team workspace, admin controls |
| Enterprise | Custom pricing | SSO, advanced security, custom limits, priority support |
ChatGPT is the tool that started the mainstream AI revolution and it remains the benchmark everything else is measured against. For most people — especially those new to AI — it should be the first tool they try. The free plan is genuinely useful, and the Plus plan at £16/month is one of the best value upgrades in the AI space. The only real downside for AI Tool Bible readers is the lack of an affiliate programme, but that doesn't diminish how powerful and accessible the tool itself is.