People using a free chatbot often ask if upgrading pays. On 22 October 2026, the first paid tier ranges from €4.99 a month (Google AI Plus) to $20 before tax (Claude Pro, with no cheaper paid option). For the four assistants, the offer is similar: more use before a cap, the strongest models and extra tools. If you never reach the free limit, you likely do not need to pay.
- Headroom: vendors sell multiples, not message counts. Google says AI Plus doubles free use and AI Pro quadruples it; Anthropic says Claude Pro gives at least five times free use per five-hour session; OpenAI says ChatGPT Go has ten times more messages, uploads and images.
- Model access: advanced reasoning, research agents, video generation and coding tools sit behind paid tiers because they use more compute.
- Bundles: Google and Microsoft add non-AI items — cloud storage, office apps, ad-free YouTube — so the chatbot is only part of the bill.
What you actually buy
Mostly margin. The useful question is not which AI is best but where the free version falls short. If a chatbot forgets early parts of a long conversation, paying may help: ChatGPT Go promises more memory and a bigger context window. If answers fail to persuade you, more money will not always fix that.
“al menos 5 veces más uso” — Anthropic, on Claude Pro versus the free plan in each five-hour session.
Plan by plan
ChatGPT: Plus costs $20 a month with higher limits, priority at peak hours, advanced reasoning, voice, image generation, file analysis and deep research “donde esté disponible”. Go costs $8 in the US, but OpenAI said in January 2026 that its price “se adapta a algunos mercados”; Spain is one. The OCU found Go at €9.99 and Plus at €23 in November 2025, above a direct dollar conversion. OpenAI does not publish those amounts without login, so check before subscribing. It will test ads in free and Go, starting in the US, while Plus and Pro stay ad-free. Pro is $200, but since 10 September 2026 OpenAI has paused signups and upgrades; help pages also mention $100.
Gemini: free includes Flash-Lite, image generation, Deep Research, Gemini Live, Canvas, Gems and 15GB. AI Plus €4.99 adds Flash, video generation and 400GB. AI Pro €21.99 adds Pro, four times use, Gemini in Gmail and Docs, 5TB and YouTube Premium Lite. AI Ultra is €99.99 for five times AI Pro use, or €219.99 for twenty times.
Claude: Anthropic lists dollars before tax. The free plan allows web search, file creation, code execution, memory, connectors and five projects. Pro $20 (or $17 annual) adds more use, Claude Code, research, unlimited projects and Claude in Chrome and Microsoft 365. Max runs $100–$200 for five or twenty times Pro use. Limits reset every five hours; paid plans also have weekly caps.
Copilot: Microsoft sells it inside Microsoft 365. Personal €10/month or €99/year includes Word, Excel, PowerPoint, Outlook, Copilot, 1TB and a higher usage limit than free. Family €13/month or €129/year covers six people, but AI is reserved for the subscription owner. Premium €22/month or €219/year offers broad use and research-analysis agents. Basic has no AI.
“mayor límite de uso que la versión gratuita”; “solo para el propietario de la suscripción”; “uso amplio”.
Prices were checked on 22 October 2026. Google and Microsoft quote Spanish prices in euros. Euro conversions use the ECB rate 1 euro = 1.1205 dollars and are indicative, excluding VAT or local pricing; the ChatGPT gap in Spain is notable.
Where free stops being enough
Free tiers are generous: all four exist, and Gemini and Claude include advanced functions such as Deep Research and code execution. Problems arise with heavy daily use on long documents or hours-long chats; with specific tools (Claude Code only on paid Claude, Gemini video from AI Plus, Copilot in Word or Excel from Microsoft 365 Personal or higher); and with privacy. No paid plan keeps data off the cloud. If that matters, compare mobile and cloud AI, or run local models via Ollama or LM Studio.
The best test is your own usage. If the free tier never blocks you, a subscription buys unused capacity. If long conversations, a particular tool or a Google/Microsoft bundle is the real gap, paying can be justified. Because vendors sell vague multiples rather than clear message counts, decide by the limit you keep hitting, not by more.