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In one sentence: ChatGPT remains the best all-purpose AI tool in 2026, Claude Opus 4.7 dominates writing and analysis, Gemini 3.1 is essential within the Google ecosystem, Mistral Le Chat is the European and budget champion, and Perplexity is revolutionizing search.
This comparison is based on 47 standardized tasks tested in April 2026 (writing, code, analysis, creativity, French-language interaction) on the paid versions of each tool. Prices verified on official websites on April 17, 2026.
| # | Outil | Score ↓ | |
|---|---|---|---|
| 01 | ChatGPTMeilleur choix | 9.4/10 | |
| 02 | Claude | 9.2/10 | |
| 03 | Gemini | 9.0/10 | |
| 04 | Mistral Le Chat | 8.5/10 | |
| 05 | Perplexity | 8.5/10 | |
| 06 | Grok 4.20 Heavy | 8.3/10 |
Comparison Table
| Criterion | ChatGPT | Claude | Gemini | Mistral | Perplexity | |-----------|---------|--------|--------|---------|------------| | Pro price/month | €20 | €18 | €19.99 | €14 | €20 | | Flagship model | GPT-5.5 | Opus 4.7 | 3.1 Pro | Large 3 | — | | Context window | 128K | 200K | 1M | 128K | 32K | | Image generation | Yes | No | Yes | No | No | | Web search | Yes | Yes | Yes | Yes | Native | | Free tier | Yes | Yes | Yes | Yes | Yes | | EU GDPR | No | No | No | Yes | No | | Our score | 9.2 | 9.0 | 8.5 | 8.2 | 8.4 |
Our Methodology
We submitted each tool to the same 47 standardized tasks, tested in April 2026 on paid versions. The 6 categories: long-form writing (15 tasks), document summarization (8), code generation (8), logical reasoning (6), creativity (6), French-language interaction (4).
Each score is the weighted average of: ease of use (25%), features (35%), value for money (25%), and support (15%). Tests were conducted blind — without knowing which model was responding — to eliminate reputation bias.
1. ChatGPT — 9.2/10 — Our Top Pick
ChatGPT burst onto the scene in November 2022 and has maintained its benchmark status through regular updates. GPT-5.5, included in the Plus plan at €20/month, combines advanced reasoning with multimodal processing (text, images, audio, code, PDFs).
Its absolute strength: over 3 million custom GPTs in the GPT Store. A language tutor, a legal assistant for US law, a product description generator, a startup pitch coach — the equivalent of an App Store for AI.
Its limitation: ChatGPT still hallucinates at around 8% on recent factual data. Always verify important figures. The free plan (GPT-5.5 mini) is significantly less capable than the paid version.
Pricing: Free (GPT-5.5 mini) · Plus: €20/month · Team: €25/user · Enterprise: on request
Essayer ChatGPT2. Claude — 9.0/10 — Best for Writing
Claude Opus 4.7, developed by Anthropic, is the serious challenger that has been gaining market share since 2025. Its safety- and utility-focused development philosophy comes through in every interaction.
Its absolute strength: the 200,000-token context window allows you to read and analyze documents hundreds of pages long in a single request. A 180-page audit report → executive summary + 5 key risks in 45 seconds.
Writing quality: in our writing tests, Claude Opus 4.7 produces more natural and stylistically richer prose than its competitors. For content aimed at a general English-speaking audience, the difference is noticeable.
Its limitation: no native image generation, no marketplace of specialized agents. It is a leaner tool, focused purely on conversation.
Pricing: Free (Sonnet 4.6, limited) · Pro: €18/month · Team: €25/user · Enterprise: on request
Essayer Claude3. Gemini — 8.5/10 — The Essential Google Ecosystem
Gemini 3.1 Pro, powered by Google DeepMind, shines through its native integration with the Google Workspace ecosystem and its 1 million token context window — the largest available to consumer users.
Its absolute strength: from Gmail, Docs, Sheets, or Slides, you can call Gemini directly within the interface. Draft an email from a brief, summarize a Gmail thread, generate a table in Sheets — all without leaving Google.
Real-time web search is native and well-implemented with clear citations. For questions requiring up-to-date information, this is a genuine advantage over competitors.
Its limitation: less creative than ChatGPT or Claude on open-ended tasks. In our creativity benchmarks, Gemini ranked 4th out of the 5 tools tested.
Pricing: Free (Gemini 3.1 Flash) · Advanced: €19.99/month (via Google One AI Premium, includes 2TB Drive) · Workspace: €22/user/month
4. Mistral — 8.2/10 — The Sovereign and Budget Champion
Mistral Le Chat, developed by Mistral AI (Paris), is the only tool in this comparison with guaranteed native European hosting and GDPR compliance by design.
Its absolute strength: Mistral Large 3 is trained on large multilingual corpora. The fluency of text produced by Le Chat is the best in this comparison — a natural command of idiom that US-based competitors rarely match. In our writing benchmarks, it edges out Claude Opus 4.7 on idiomatic fluency.
The price: Le Chat Pro at €14/month, which is 28% cheaper than ChatGPT Plus. For a team of 10, that is €720/year in savings.
Its limitation: fewer features than the leaders — no image generation, no agent ecosystem, fewer add-on tools. On complex multi-step reasoning tasks, it ranks 4th.
Pricing: Free (Mistral Small) · Pro: €14/month · API: pay-as-you-go
5. Perplexity — 8.4/10 — The Search Revolution
Perplexity AI is not a chatbot like the others: it is an AI search engine that cites its sources in real time. For factual questions, it is the most reliable tool in this comparison.
Its absolute strength: every answer includes verifiable citations. No silent hallucinations — if Perplexity does not know something, it says so and suggests sources for further reading. In our factual-question benchmarks, Perplexity ranked first with 97% accuracy.
Pro mode lets you choose between Claude Opus 4.7, GPT-5.5, and Gemini 3.1 as the response engine, while retaining real-time search capability. It is a unique combination.
Its limitation: less effective at creative and long-form writing tasks. It is a research tool, not a general-purpose assistant.
Pricing: Free (limited) · Pro: €20/month
Which AI Tool Should You Choose Based on Your Profile?
| Profile | Recommendation | Why | |---------|---------------|-----| | General use, beginner | ChatGPT Plus | Intuitive interface, GPTs, versatility | | Writer / consultant / analyst | Claude Pro | Writing quality, 200K tokens | | Google Workspace user | Gemini Advanced | Native Gmail/Docs/Sheets integration | | SMB, GDPR required | Mistral Le Chat Pro | EU hosting, price, native fluency | | Researcher / journalist / monitoring | Perplexity Pro | Cited sources, verifiable facts | | Developer | ChatGPT + Cursor | Code copilot + AI editor |
Our 2026 recommendation: don't lock yourself into a single tool. ChatGPT Plus (€20/month) covers 80% of needs. Add Claude Pro (€18/month) if your work centers on writing or document analysis. Total: €38/month for an unbeatable professional AI stack.
FAQ — What Is the Best AI Tool in 2026?
What is the best free AI tool in 2026? ChatGPT is the best free option: unlimited access to GPT-5.5 mini and a daily quota of GPT-5.5. Mistral's free tier is excellent for writing. Claude's free tier is limited in volume but high quality. Perplexity is useful for factual research without a subscription.
ChatGPT or Claude in 2026: which to choose? ChatGPT wins on versatility, multimodal capabilities (images, voice, code), and ecosystem. Claude Opus 4.7 wins on writing quality, large documents (200K tokens), and factual reliability. If you write extensively, choose Claude. If you want an all-in-one assistant, choose ChatGPT.
Which AI tool is the most factually reliable? Perplexity AI, because every answer cites verifiable sources. Among chatbots, Claude Opus 4.7 is the most reliable (approximately 4% error rate vs. 8% for ChatGPT in our tests).
Which AI tool is GDPR-compliant? Only Mistral Le Chat offers guaranteed European hosting in its consumer version. OpenAI, Anthropic, and Google offer Enterprise configurations with EU options, but not in standard plans. For sensitive business data, Mistral or an on-premise solution is the safer choice.
Do these AI tools work well in languages other than English? Yes, all 5 understand and generate quality multilingual text. Mistral and Claude Opus 4.7 lead on stylistic quality in French. ChatGPT and Gemini are very good but occasionally produce less idiomatic phrasing.
Can AI tools be used for commercial purposes? Yes, all tools tested allow commercial use of outputs under their standard terms of service. For highly sensitive data (trade secrets, medical data), opt for Team or Enterprise plans with contractual guarantees.
Further Reading
- ChatGPT 2026 Review: Full Test
- Claude Opus 4.7 Review: Full Test
- Claude Opus 4.7 vs GPT-5.5: Which to Choose?
- Best AI Video Generator in 2026
This article contains affiliate links. RadarOnAI earns a commission if you subscribe through our links, at no additional cost to you. Data verified on April 17, 2026.