What's the best free AI chatbot?

ChatGPT, Claude, Gemini and Perplexity all offer a solid free tier; the choice depends on your main use.

ChatGPT or Claude: which to choose?

ChatGPT for versatility and ecosystem, Claude for writing finesse and long documents.

Which AI cites its sources?

Perplexity is built to answer with clickable, verifiable sources, ideal for research.

Comparatif

Best AI for an AI assistant in 2026 (comparison)

For a conversational AI assistant, ChatGPT stays the most versatile, Claude excels at long, nuanced text, Perplexity at sourced answers and Gemini for the Google ecosystem. Our pick: ChatGPT day-to-day, Claude for writing, Perplexity for research.

An AI assistant answers, writes, summarises, translates and reasons — the most universal tool of all. The best depends on your priority: versatility, writing quality, sourced answers or integration with your tools.

Here's our comparison of the best conversational assistants.

Our pick of the best AI for an AI assistant

1
ChatGPTFavorito
El asistente de IA todoterreno que inició la ola.
Precio: Free · Plus $20/mo · Pro $100/200Voir la fiche
2
ClaudeFavorito
El asistente que brilla en la escritura extensa y el razonamiento.
Precio: Free · $20/mo (Pro)Voir la fiche
3
GeminiRecomendado
El asistente de IA de Google, integrado en todo tu ecosistema.
Precio: Free · AI Pro $19.99/mo · Ultra $99.99/199.99Voir la fiche
4
PerplexityFavorito
El motor de respuestas que siempre cita sus fuentes.
Precio: Free · $20/mo (Pro)Voir la fiche
5
Microsoft CopilotRecomendado
El asistente de IA tejido en Microsoft 365 y la web.
Precio: Free · Copilot Pro $20/mo · M365 Copilot $18-30/userVoir la fiche
6
Mistral (Le Chat)Recomendado
El asistente de IA francés: rápido y respetuoso con la privacidad.
Precio: Free · from $14.99/moVoir la fiche
7
DeepSeekRecomendado
El LLM de vanguardia a bajo coste: chat gratuito y API muy asequible.
Precio: Free chat · usage-based API (from ~$0.14/M tokens)Voir la fiche
8
GrokRecomendado
El asistente conversacional de xAI, integrado en X.
Precio: Free (limited) · SuperGrok $30/moVoir la fiche

Comparison table

Outil	Precio	Nivel	Veredicto
ChatGPT	Free · Plus $20/mo · Pro $100/200	Principiante	Favorito
Claude	Free · $20/mo (Pro)	Principiante	Favorito
Gemini	Free · AI Pro $19.99/mo · Ultra $99.99/199.99	Principiante	Recomendado
Perplexity	Free · $20/mo (Pro)	Principiante	Favorito
Microsoft Copilot	Free · Copilot Pro $20/mo · M365 Copilot $18-30/user	Principiante	Recomendado
Mistral (Le Chat)	Free · from $14.99/mo	Principiante	Recomendado
DeepSeek	Free chat · usage-based API (from ~$0.14/M tokens)	Pro	Recomendado
Grok	Free (limited) · SuperGrok $30/mo	Principiante	Recomendado

How to choose an AI for an AI assistant?

General versatility: ChatGPT covers the most needs.
Long, nuanced writing: Claude has a slight edge.
Sourced, verifiable answers: Perplexity cites its sources.
Office integration: Microsoft Copilot and Gemini within their suites.

Frequently asked questions

What's the best free AI chatbot?: ChatGPT, Claude, Gemini and Perplexity all offer a solid free tier; the choice depends on your main use.
ChatGPT or Claude: which to choose?: ChatGPT for versatility and ecosystem, Claude for writing finesse and long documents.
Which AI cites its sources?: Perplexity is built to answer with clickable, verifiable sources, ideal for research.

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