Claude or ChatGPT 4o: who's the real brains behind B2B generative AI?
We thought we'd seen it all with ChatGPT. Then Claude came along. Calmer, more factual, sometimes more brilliant. A bit like that discreet colleague who always has the right answer at the right time.
Welcome to the match of the year: Claude 3 vs ChatGPT 4o. Two artificial intelligences, two visions of augmented assistance, and above all two powerful B2B tools that are transforming the way we work!
Between OpenAI's ultra-connected toolbox and Anthropic's context-sensitive, secure co-pilot, the choice isn't so simple. So we've sorted it out for you: features, use cases, pricing, integrations, UX... It's all there.
Our aim: to help you choose the AI that will really make a difference to your projects.
Note to readers
Yes, GPT-5 was recently released. But for this comparison, we've chosen to base ourselves on ChatGPT 4o, for one simple reason: it's the most stable, documented and generationally equivalent model to Claude 3.
As GPT-5 is still in its infancy, criticized for its overly mechanical tone and uneven performance, we prefer to compare what is actually used in business today, not what has just come out of the lab.
In short, Claude 3 vs ChatGPT 4o is a balanced duel. Not a race between a Tesla and a prototype with no brakes.
What is Claude?
Introducing Claude
Claude is the kind of AI that doesn't make noise, but reads between the lines.
Developed by Anthropic, a company co-founded by OpenAI alumni, Claude 3 is the latest evolution of a conversational assistant designed for deep analysis, rigor and security.
Its name? A nod to Claude Shannon, father of information theory. Its DNA? To offer AI that is more aligned, more reliable, more ethical, that avoids science-fiction-style hallucinations. It's a far cry from American-style showmanship - here, it's more a case of the discreet expert mastering his files.
In terms of positioning, Claude targets companies dealing with complex documents, sensitive data or structured workflows. He excels in :
- Summarizing long reports
- Analysis of PDF, Excel and Word files
- Precise drafting based on structured data
- Legal, financial and scientific assistance
- Contextual team collaboration (via Notion, Slack, etc.)
No wonder companies like Slack, Zoom and Notion are integrating it directly into their products. Claude is designed to adapt to the professional environment, without friction or distraction.
In short, if ChatGPT is the generalist who knows how to do (almost) everything, Claude is the specialized consultant you call to make sure you don't screw up.
Claude's main features
We're not going to beat around the bush: Claude shines in complex tasks requiring memory, logic and clarity. Here are the features that make the difference:
- Heavy document analysis: Claude 3 can ingest up to 150,000 words at a time (yes, the equivalent of a novel), making it formidable for summarizing, comparing or annotating PDFs of contracts, audit reports, market studies.
- Fine contextual understanding: It picks up nuances, follows precise instructions and avoids "guessing" as some more creative models do. A plus for legal, finance or compliance professions .
- Structured, synthetic answers: Claude formats his answers with rigor: bullet points, tables, headings. He's the AI who'll never give you a 30-line pamphlet when you ask him for a clear summary.
- Security and ethical alignment: Designed with a strong focus on bias reduction and refusal of certain sensitive topics. Ideal for regulated or ethically sensitive sectors (healthcare, insurance, public sector...).
- Direct collaboration with your business tools: Available via Slack, Notion, Zoom or API, Claude integrates unobtrusively into everyday business life - no need to switch tabs every 3 minutes.
- Sober but reliable responses: Less creative than ChatGPT? Yes, but much more stable when it comes to rendering data, reasoning or legal text extracts.
In other words, Claude won't invent a poem in Excel, but he'll be able to explain a contract clause in 3 lines without making a mistake.
Claude
Advantages and disadvantages of Claude
Claude has made a name for itself in the AI jungle. It is particularly appealing to professionals looking for a precise, reliable and rigorous assistant. Here's what you gain (and lose) by adopting it.
✅ What we like about Claude
- He excels at reading and analyzing long documents: With his ability to process up to 150,000 words, Claude is one of the few models who can digest an 80-page contract or an entire market study without batting an eyelid.
- He structures his answers with almost human logic: Claude produces clean, well-organized, easy-to-read texts - a real relief for pros who don't want to "reformat" afterwards.
- He avoids hallucinations: Thanks to training focused on alignment and caution, Claude is much more reliable when it comes to rendering facts, figures or legal extracts, without freewheeling.
- He respects the highest standards of confidentiality: Anthropic is banking on "constitutional" AI, governed by strong ethical principles. A real plus for sensitive sectors.
- It integrates easily into everyday tools: No need to open a new app: Claude is directly accessible from Slack, Notion or Zoom, making it easy to adopt in the enterprise.
❌ What can hold it back
- It can't do everything: Unlike ChatGPT 4o, Claude can't generate images, interpret complex files or browse the web in real time. It remains text-centric.
- It's not cut out for pure creation: To write an inspiring blog post or a dynamic YouTube script, Claude lacks tone, style, and sometimes imagination.
- Few native tools: No code interpreter, no data analysis mode, no native voice option... We're sticking to sober usage, focused on written conversation.
- It has no dedicated desktop version: Usable only via browser or API, Claude does not yet offer a true desktop or standalone mobile application.
- Its responses sometimes lack flexibility: Even with precise instructions, it tends to remain very formal, which can frustrate those who expect more "personality" or conversational tone.
What is ChatGPT?
Overview of ChatGPT 4o
ChatGPT 4o is the AI that knows how to do (almost) everything... and often does it very well. Developed by OpenAI, it's the model that democratized generative AI in the professional world. Since the arrival of version "4o" in May 2024, we've entered a new era: that of native multimodal AI, capable of understanding and generating text, images, code and even voice in a single interface.
Its name, "4o", stands for "omnimodal". Behind this barbaric term: a responsive, fluid, interactive model, designed for concrete and varied corporate uses.
Who is ChatGPT 4o designed for? Just about anyone. It's a versatile assistant used by :
- Marketing teams (content ideas, copywriting, SEO overhaul...)
- Developers (debugging, code generation, scripting)
- Customer and HR departments (automatic responses, onboarding, internal Q&A)
- Product or strategy departments (summaries, analyses, competitive intelligence...)
Our customers include millions of companies worldwide, from solo start-ups to major corporations. OpenAI's "ChatGPT for Teams" offering includes native integrations with Microsoft (via Copilot), Salesforce, Canva, HubSpot and more.
What sets ChatGPT 4o apart is not just its intelligence, but the on-board toolset that makes it a veritable Swiss army knife of digital work. An AI that doesn't stop at the answer, but can draw a diagram, read a video, correct code and rephrase a sales pitch - all in the same session.
Main features of ChatGPT 4o
If Claude is the serious advisor in the gray suit, ChatGPT 4o is the multitasking talent who works fast, well and with a wow factor. Here's what he offers under the hood:
- Native multimodal comprehension and generation: ChatGPT 4o can read a picture, analyze a table, listen to an audio file or respond to a spoken word, without changing engines. A photo of a whiteboard? It transcribes and summarizes it. A voice recording? It interprets it as a text. It's fluid, fast and amazing.
- Access to powerful on-board tools
The 4o model directly integrates : - a Python interpreter (ex-Code Interpreter) to perform calculations, manipulate CSV files or create graphics,
- a web browser for real-time queries,
- an image generator (DALL-E 3),
- interactive voice mode (alpha version).
- Personalized memory (can be activated): ChatGPT can remember your preferences, the tone you like, your business objectives or even the way you phrase things. Ideal for regular users who want a real co-pilot.
- Natural multilingualism: It switches seamlessly from one language to another. Handy for international briefs, multilingual e-mails or quick translations with context.
- Fluid interface, with history, sharing and favorites: You can organize your chats, find an old reply, copy and paste your own blocks, or even share a conversation with a colleague. It's designed for collaboration and follow-up.
- Connected ecosystem: Thanks to OpenAI integration with Microsoft 365, Zapier, Slack, Notion, etc., ChatGPT becomes the augmented brain of a large number of professional SaaS tools.
In short, ChatGPT 4o is creative, responsive and ultra-connected. It's the AI that can go from brainstorming ideas to visualizing data in a single click. It's as if your intern and your IT department were merging.
ChatGPT
Advantages and disadvantages of ChatGPT 4o
ChatGPT 4o is like a Swiss Army knife doped with AI. But like all Swiss Army knives, it shines for its versatility... and sometimes overzealousness. Here's a balanced overview.
✅ What we like about ChatGPT 4o
- It covers a wide range of professional use cases: from the developer looking to debug code, to the HR manager wanting to create an onboarding, to the marketer running out of ideas, ChatGPT 4o responds with an impressive level of relevance.
- It's ultra-multimodal and fast: image analysis, document reading, video synthesis, audio file processing... all in the same interface. A true productivity hub for teams.
- It includes advanced, ready-to-use tools: Need to extract data from a CSV, generate a graph, or simulate a complex calculation? No need for external integration: the "Code Interpreter" mode is already there.
- Its interface has been designed to ensure fluidity: history navigation, clean copy of answers, sharing options, keyboard shortcuts... The user experience is truly polished, even for the uninitiated.
- It integrates seamlessly with enterprise tools: via Microsoft Copilot, Zapier, Notion or Slack, ChatGPT becomes a direct extension of your business processes. AI that adapts to your stack, not the other way around.
❌ What can hold it back
- It can "hallucinate" or invent information: Despite its progress, ChatGPT remains a generative model. It can still produce inaccurate data or overconfident responses - not ideal for regulatory or sensitive contexts.
- It sometimes favors form over substance: ChatGPT likes to please you: it wraps up answers, embroiders a little, adds titles where they weren't asked for. Not always what you'd expect in a structured, professional context.
- Memory management is still imperfect: even with the memory option activated, ChatGPT doesn't always retain instructions over the long term. It may forget your preferred tone or rehash the basics.
- Not always transparent about its sources: It can generate summaries, but rarely quotes precise references (except via web browsing). This is a hindrance if you work in watch, research or auditing.
- Freeware has its limits: The free version gives access to GPT-3.5, not 4o. You need to upgrade to the ChatGPT Plus subscription ($20/month) to benefit from the full model and its tools.
Claude vs ChatGPT 4o: compare features
We're getting down to the nitty-gritty here. We've tested, analyzed, cross-checked and compared the two AIs on 5 major B2B usage areas.
Spoiler: there's no single winner, but distinct strengths depending on needs.
Summary table
| Function / Use | Claude 3 | ChatGPT 4o |
| Reading and analysis of long documents | ✅ High-performance (150k words) | ⚠️ Limited (~300 pages max) |
| Creation of marketing/creative content | ❌ Too factual | ✅ Natural tone, more fluid |
| Image, audio, code generation | ❌ No multimodal tools | ✅ DALL-E, voice, code interpreter |
| Reliability of responses / alignment | ✅ Very reliable | ⚠️ Can hallucinate |
| Integration with SaaS tools | ✅ Slack, Notion, API | ✅ Microsoft 365, Zapier, +++ |
Focus 1: Document analysis
Claude is the undisputed king of deep reading. He ingests 80-page contracts without batting an eyelid, summarizes tender documents or compares versions of GTCs.
ChatGPT 4o can read a PDF, but is quickly limited in volume and contextual consistency.
It can lose track or generate superficial summaries.
👉 To remember
When it comes to handling long, technical or regulatory documents, Claude is the reference.
Focus 2: Content creation
ChatGPT 4o has the edge here. Its ability to suggest angles, rephrase, adapt tone or even structure a blog post is far superior. He understands the intention behind a marketing prompt.
Claude, on the other hand, remains factual, sober and a little stiff - which can put a damper on creativity.
👉 To remember
To generate marketing or editorial content, ChatGPT 4o is clearly more inspired.
Focus 3: Multimodality and embedded tools
This is ChatGPT 4o's favorite playground. It can analyze images, read a graph, respond orally, manipulate CSV files, generate an infographic with DALL-E... All without changing platforms.
Claude, on the other hand, remains text-only, even if his word processing is particularly solid.
👉 To remember
If you're looking for a truly all-in-one AI, ChatGPT 4o is unbeatable today.
Focus 4: Reliability and rigor of answers
Claude was designed to avoid drifting and invented answers. It is more cautious, more rigorous, and often more precise in technical or legal areas.
ChatGPT, even in version 4o, can sometimes hallucinate... even with aplomb.
👉 To remember
Need for rigor, reliability or caution? Claude is more certain on this point.
Focus 5: Integrations and ecosystem
Claude integrates well, notably via API or with tools such as Notion, Slack or Zoom. But ChatGPT 4o is better connected, thanks to the Microsoft ecosystem, extensions and a real "productive hub" logic.
👉 To remember
For AI connected to all your SaaS tools, ChatGPT 4o offers greater flexibility.
Claude vs ChatGPT 4o: compare prices
In terms of pricing, both AIs adopt a freemium model, but with very different rationales. One focuses on stability, the other on functional abundance. Here's what you need to know to make the right choice for your means... and your needs.
Offer comparison table
| Offer / Functionality | Claude 3 (Anthropic) | ChatGPT 4o (OpenAI) |
| Free version | ✅ Claude 3 Sonnet (via claude.ai) | ✅ GPT-3.5 only (via chat.openai.com) |
| Individual pay version | ❌ No individual paid version | ✅ ChatGPT Plus - $20/month |
| Pro / enterprise version | ✅ Claude Pro via API or Slack (usage fee) | ✅ ChatGPT Team / Enterprise |
| Access to the premium model | ✅ Claude 3 Opus via Slack or API only | ✅ GPT-4o complete via Plus subscription |
| Multimodal functionalities | ❌ Text only | ✅ Images, audio, web, code |
| Native integrations | Slack, Notion, Zoom (free version or API) | Microsoft 365, Zapier, third-party plugins (via Plus) |
| Access via API (pay-per-use) | ✅ Yes (rates: see below) | ✅ Yes (rates: see below) |
API rates (August 2025 - sources: OpenAI / Anthropic)
| Model | Input (1M tokens) | Output (1M tokens) |
| Claude 3 Opus | 15 $ | 75 $ |
| ChatGPT 4o | 5 $ | 15 $ |
⚠️ Please note: Claude is much more expensive to run than ChatGPT 4o. On the other hand, it compresses information better, so potentially consumes fewer tokens per task.
👉 To remember
- For versatile, affordable individual use, ChatGPT 4o with the Plus subscription ($20/month) is the richest option.
- For professional use focused on documents, rigor and context, Claude 3 Opus via API (or Slack) remains a safe bet, but more expensive.
📌 And ChatGPT 5?
Since August 2025, GPT-5 has been officially deployed. It is available in the same packages as GPT-4o, notably via the ChatGPT Plus subscription at $20/month, or in the Teams and Enterprise packages.
But beware:
➡️ GPT-5 does not (yet) have specific API pricing,
➡️ is still in its stabilization phase (with mixed feedback on its relevance and tone),
➡️ and ChatGPT 4o can still be selected manually in the Plus subscription, proof that OpenAI knows not to bury 4o too quickly.
Conclusion: for the time being, GPT-5 has no significant impact on rates. It coexists with GPT-4o... but we recommend you wait a while before adopting it in production.
Claude vs ChatGPT 4o: which interface is more intuitive?
An AI can be brilliant on paper, but if its interface is a pain to use... it'll end up forgotten in a tab.
The good news is that Claude and ChatGPT 4o both focus on simplicity, but with very different approaches.
We tested them on 4 essential UX criteria: ease of use, clarity of display, personalization and long-term project management.
UX comparison table
| Criteria | Claude 3 ✅ | ChatGPT 4o ✅ |
| Easy to use | ✅ Immediate, minimalist | ✅ Very intuitive, fast |
| Display of answers | ✅ Sober, structured | ⚠️ More "verbose", sometimes too creative |
| Personalization | ❌ No tone or memory settings | ✅ Activatable memory, adjustable style |
| Project / chat management | ⚠️ Limited: no bookmarks or organization | ✅ History, bookmarks, sharing, renaming |
| Mobile / desktop ergonomics | ✅ Efficient responsive web | ✅ Native mobile app, fluid desktop |
Analysis: two well-thought-out UX, but...
Claude plays the sobriety card: an ultra-light, fast, to-the-point interface. Perfect for professionals who want content, not decorum.
But it's still very basic: no structured history, no favorites, no customization options.
ChatGPT 4o, on the other hand, offers a complete and polished experience. The interface evolves quickly, the tools are well integrated, and you can really organize your sessions (rename, pin, share...).
On the downside, it sometimes overdoes its answers, with unsolicited suggestions and rephrasing.
👉 To remember
- Claude relies on targeted integrations, with a strong focus on Slack, Notion and Zoom. These connections are fluid, useful and designed for professionals. But as soon as you leave these environments, you have to go through the API, which requires a bit of dev.
- ChatGPT 4o, on the other hand, is part of an extensible ecosystem. Thanks to Microsoft Copilot, Zapier and third-party plugins, it can be used with almost any business tool: CRM, ERP, emailing, design, project management... Connectivity is a real strength.
When to choose Claude or ChatGPT 4o?
You don't have to be a data scientist to decide. The right choice depends on your business priorities, not your love of science fiction.
Here's when Claude or ChatGPT 4o make the difference, without beating around the bush.
If you work in a structured, sensitive or regulated environment...
➤ choose Claude
Claude shines when it comes to handling complex data, long documents or sensitive issues. It's the ideal ally for the following sectors:
- Legal: contract analysis, case law summaries, regulatory proofreading.
- Finance / Audit: report processing, compliance, commented dashboards.
- Public sector, healthcare, insurance: need for rigor, confidentiality, ethical alignment.
It's also suitable if you're already using Slack, Notion or Zoom and want to integrate a discreet but formidably efficient AI.
✅ In short: choose Claude when rigor and readability take precedence over creativity.
If you need versatility, interactivity and creative tools...
➤ choose ChatGPT 4o
ChatGPT 4o is tailor-made for pros who want a multitasking assistant, connected to their tools and capable of creating content on the fly. It's the logical choice for :
- Marketing & communication: copywriting, ideas, reformulation, storytelling, image generation.
- Development & IT: code assistance, debugging, script interpretation.
- Productivity & management: synthesis, brainstorming, automation via Zapier or Microsoft 365.
Its rich interface, memory, and compatibility with numerous SaaS tools make it an "augmented generalist" AI, ideal for hybrid teams.
✅ In short: choose ChatGPT 4o when you're looking for a creative, interactive and connected co-pilot.
Things to remember from the Claude vs ChatGPT battle
So, Claude or ChatGPT 4o?
As is often the case in B2B, there's no absolute winner, just the right tool in the right place.
In a nutshell:
- Claude is methodical, reliable and cut out for precision. He excels on technical files, regulated environments, and pros who want clarity, not noise.
- ChatGPT 4o is versatile, expressive, multi-talented. It shines in creative tasks, hybrid workflows and contexts where AI needs to be a real co-pilot on a daily basis.
Summary table: need → recommendation
| Your main need | We recommend... |
| Read, synthesize and compare complex documents | ✅ Claude |
| Generate marketing or editorial content | ✅ ChatGPT 4o |
| Create images, read tables, code or automate | ✅ ChatGPT 4o |
| Get reliable answers in a sensitive sector | ✅ Claude |
| Collaborate with AI in Microsoft 365 or Slack | ✅ Both, depending on usage |
| Manage a varied workload in a team | ✅ ChatGPT 4o (Plus/Teams version) |
| Work in a regulated environment, without hallucinations | ✅ Claude |
FAQ about Claude vs ChatGPT 4o
Which AI is easiest for beginners to learn?
✅ ChatGPT 4o: its interface is intuitive, the suggestions are well thought out, and the user experience is very fluid from the very first minutes. Claude is more minimalist, so it's simple too, but less guiding.
Is Claude more reliable than ChatGPT 4o?
Yes, on complex or sensitive subjects, Claude is more rigorous. He hallucinates less, remains factual and doesn't ramble. Perfect for pros looking for precision rather than style.
Is ChatGPT 4o free?
Yes... and no.
- The free version gives access to GPT-3.5 only.
- To use GPT-4o and its advanced tools, you need to upgrade to ChatGPT Plus ($20/month).
For corporate customers, Teams and Enterprise packages are also available.
Does Claude offer a free version?
✅ Yes. Claude is available free of charge via claude.ai with the Claude 3 Sonnet model, which is efficient for the majority of text-based uses.
The premium Opus model is reserved for pro uses via API or Slack.
Which AI is best suited to marketing use?
🎯 ChatGPT 4o: more creative, more flexible, with better management of tone, persuasive structure and ideas on the fly.
Claude is more rigid, even scholastic, on this type of usage.
Can I integrate these AIs into my business tools?
✅ Yes for both, but with differences:
- Claude: well integrated with Slack, Notion, Zoom, and available as an API.
- ChatGPT 4o: integrated with Microsoft 365, Zapier, Canva, Salesforce, and compatible with many plugins.
Which AI to choose for legal or financial use?
📚 Claude without hesitation.
Its handling of legal language, its prudence, and its ability to synthesize long documents make it a reliable ally for legal, compliance or auditing pros.
Can ChatGPT 4o replace Claude?
Not really.
ChatGPT 4o is more versatile, but less reliable on long, complex data.
Claude remains irreplaceable when precision and clarity of reasoning are priorities.
Article translated from French