If you’re going to use one AI tool, it’s going to be a chatbot. These are the interfaces that let you talk to a large language model — ask questions, draft content, analyse documents, brainstorm ideas. (For a detailed comparison of the models behind these tools, see my Best LLMs in 2026 page.)

Claude
claude.aiMY TOP PICKFREEMIUM
I’m biased, and I’ll tell you why: Claude produces the best writing of any model I’ve tested. It doesn’t over-explain. It doesn’t add filler. The outputs sound like a competent human wrote them, not a machine. The 200K token context window means you can paste in long documents and work with them directly. Projects feature lets you save context across conversations.
I pay for Max because I use Claude Code and Cowork heavily (more on those below). If you’re not a power user, Pro is plenty.
Free tier available · Pro: £18/month · Max: £90/month
Best for: writing, analysis, coding, working with long documents
Visit Claude →
ChatGPT
chatgpt.comFREEMIUM
The one everyone knows. ChatGPT has the most refined user interface — voice mode, image generation (GPT-5 Image), file uploads, custom GPTs, a mobile app that’s genuinely good. The model behind it (GPT-5.4) is strong across the board, and with a 1M token context window it can handle massive documents. If you want one tool that does a bit of everything, this is it.
Where ChatGPT really shines for me is voice mode. I walk around, dictate, and have long conversations about things I’m working on. It’s like thinking out loud with a very patient colleague.
Free tier available · Plus: £20/month
Best for: general-purpose, voice conversations, image generation, mobile use
Visit ChatGPT →
Google Gemini
gemini.google.comFREEMIUM
If you live in Google Workspace (Gmail, Docs, Sheets, Slides), Gemini’s integration is the smoothest path to AI in your existing workflow. It can read your emails, reference your documents, and work within the tools you already use. The 1M+ token context window is the largest available — useful for massive documents or entire codebases.
Free tier available · Advanced: £19.99/month
Best for: Google Workspace users, massive document analysis, multimodal tasks
Visit Gemini →
Grok
grok.comFREEMIUM
Grok pulls from live X (Twitter) data, which makes it uniquely good at answering questions about what’s happening right now. Market movements, news events, trending discussions. Less polished for writing and analysis, but nothing else matches its real-time awareness.
Free with X · Premium: via X subscription
Best for: current events, news monitoring, market research
Visit Grok →
ChatLLMs
chatllm.abacus.aiPAID
If you want one subscription to try everything, start here. ChatLLMs gives you access to all the frontier models — GPT-5.4, Claude, Gemini, Grok — plus the best open-source ones, in a single interface for $10/month. It’s the best way to figure out which LLM suits you before committing to one ecosystem.
I recommend it to most of my clients as a starting point. Once you’ve found the model you prefer, move to that platform’s native subscription for the full feature set.
$10/month · First month free
Best for: trying all frontier models in one place, comparing outputs, finding your favourite LLM
Visit ChatLLMs →