Claude or ChatGPT 4o: who is the real mastermind 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 secure, contextual co-pilot, the choice isn't so simple. So we've sorted it out for you: functionality, use cases, price, integration, UX... It's all there.
Our aim is to help you choose the AI that will really make a difference to your projects.
Note to readers
Yes, GPT-5 was released recently. 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 and is criticised for being too mechanical and for its uneven performance, we prefer to compare what is actually in use in companies 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?
General presentation of Claude
Claude is the kind of AI that doesn't make any noise, but reads between the lines.
Developed by Anthropic, a company co-founded by former OpenAI employees, Claude 3 is the latest evolution of a conversational assistant designed for in-depth analysis, rigour and security.
Its name? A nod to Claude Shannon, the father of information theory. Its DNA? To offer AI that is more aligned, more reliable, more ethical, and that avoids science-fiction-style hallucinations. This is a far cry from the American-style show - here, it's more a case of the discreet expert mastering his files.
In terms of positioning, Claude targets companies that deal with complex documents, sensitive data or structured workflows. He excels in :
- summarising long reports
- Analysing PDF, Excel and Word files
- Precise drafting based on structured data
- Legal, financial and scientific assistance
- Contextual team collaboration (via Notion, Slack, etc.)
So it's hardly surprising that 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 specialist consultant you call to make sure you don't mess up.
Claude's main features
We're not going to beat around the bush: Claude excels at complex tasks that require memory, logic and clarity. Here are the features that make the difference:
- Analysis of large documents: Claude 3 can ingest up to 150,000 words at a time (yes, the equivalent of a novel), making it formidable for summarising, comparing or annotating PDFs of contracts, audit reports and market studies.
- Fine contextual understanding: It picks up on nuances, follows precise instructions and avoids 'guessing' as some more creative models do. A plus for jobs in legal, finance or compliance.
- Structured, synthetic answers: Claude formulates his answers rigorously: bullet points, tables, headings. This is the AI that will never give you a 30-line pamphlet when you ask for a clear summary.
- Security and ethical alignment: Designed with a strong focus on reducing bias and avoiding certain sensitive subjects. Ideal for regulated or ethically sensitive sectors (health, insurance, public sector, etc.).
- Direct collaboration with your business tools: Available via Slack, Notion, Zoom or API, Claude integrates discreetly into your day-to-day work - no need to change tabs every 3 minutes.
- Sober but reliable responses: Less creative than ChatGPT? Yes, but much more stable when it comes to rendering a piece of data, a line of reasoning or an extract from a legal text.
In other words, Claude won't invent a poem in Excel, but he will be able to explain a contract clause in 3 lines without making a mistake.
Claude
Advantages and disadvantages of Claude
Claude has carved out a special place 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 analysing 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 responses with an almost human logic: Claude produces clean, well-organised texts that are easy to read - a real relief for professionals 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 high 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: There's no need to open a new app: Claude can be accessed directly from Slack, Notion or Zoom, making it easy for companies to adopt.
❌ 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 focused on text.
- 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.
- It has few native tools: There's no code interpreter, no data analysis mode, no native voice option... We're sticking with a sober usage, focused on written conversation.
- There ' s no dedicated desktop version: Claude can only be used via a browser or API, and does not yet offer a truly standalone desktop or 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?
General presentation of ChatGPT 4o
ChatGPT 4o is the AI that can do (almost) everything... and often does it very well. Developed by OpenAI, this is the model that democratised generative AI in the professional world. Since the arrival of version '4o' in May 2024, we have 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 business uses.
Who is ChatGPT 4o designed for? Just about anyone. It's a versatile assistant used by :
- Marketing teams (content ideas, copywriting, SEO overhaul, etc.)
- Developers (debugging, code generation, script creation)
- Customer and HR departments (automatic responses, onboarding, internal Q&A)
- Product or strategy departments (summaries, analyses, competitive intelligence, etc.)
On the customer side, there are millions of companies worldwide, from solo start-ups to large groups. OpenAI offers ChatGPT for Teams and native integrations with Microsoft (via Copilot), Salesforce, Canva, HubSpot, etc.
What sets ChatGPT 4o apart is not just its intelligence, but the set of on-board tools that make 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 grey suit, ChatGPT 4o is the multitasking talent who works fast, well and with a wow factor. Here's what he's got under the bonnet:
- Native multimodal comprehension and generation: ChatGPT 4o can read an image, analyse a table, listen to an audio file or respond to a spoken word, without changing engines. A photo of a whiteboard? It transcribes and summarises. 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) for making calculations, manipulating CSV files or creating graphics,
- a web browser for real-time queries,
- an image generator (DALL-E 3),
- an interactive voice mode (alpha version).
- Personalised 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 emails or quick translations with context.
- Fluid interface, with history, sharing and favourites: You can organise 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 visualising data in a single click. It's a bit like merging your intern and your IT department.
ChatGPT
Advantages and disadvantages of ChatGPT 4o
ChatGPT 4o is a bit like a Swiss Army Knife doped up with AI. But like all Swiss Army knives, it shines for its versatility... and sometimes over-zealousness. 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 system, 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 real 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.
- The interface has been designed to be easy to use: navigation through the history, clean copies of responses, sharing options, keyboard shortcuts, etc. The user experience has been carefully thought out, even for the uninitiated.
- It integrates easily into your business 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 slow it down
- 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 favours form over content: ChatGPT likes to please you: it wraps up the answers, embroiders a little and adds titles where they were not requested. 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 monitoring, research or auditing.
- The free version 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 take advantage of the full model and its tools.
Claude vs ChatGPT 4o: compare features
Let's get down to business. We've tested, analysed, cross-checked professional opinions and compared the two AIs on 5 major areas of B2B use.
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 |
| Generation of images, audio, code | ❌ 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 swallows 80-page contracts without batting an eyelid, summarises tender documents or compares versions of terms and conditions.
ChatGPT 4o can read a PDF, but is quickly limited in volume and contextual consistency.
It can lose track or generate summaries that are too superficial.
👉 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 the 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 brake 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 favourite playground. It can analyse 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 though 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 rigour of responses
Claude was designed to avoid drift 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 be hallucinatory... even with aplomb.
👉 To remember
Need for rigour, 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' approach.
👉 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 remember to make the right choice for your budget... 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 pay version | ✅ ChatGPT Plus - $20/month |
| Pro / business 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 prices (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 use than ChatGPT 4o. On the other hand, it compresses information better, so potentially consumes fewer tokens per task.
👉 To remember
- For versatile and affordable individual use, ChatGPT 4o with the Plus subscription ($20/month) is the richest option.
- For professional use focused on documents, rigour and context, Claude 3 Opus via API (or Slack) is still a safe bet, but more expensive.
📌 And what about ChatGPT 5?
GPT-5 has been officially deployed since August 2025. It is available in the same packages as GPT-4o, in particular 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 stabilisation phase (feedback on its relevance and tone is mixed),
➡️ 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 moment, GPT-5 does not have a significant impact on prices. It coexists with GPT-4o... but we recommend that you wait a little 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 key UX criteria: ease of use, clarity of display, customisation 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 |
| Personalisation | ❌ No tone or memory settings | ✅ Activatable memory, adjustable style |
| Project / chat management | ⚠️ Limited: no favourites or organisation | ✅ History, favourites, sharing, renaming |
| Mobile / desktop ergonomics | ✅ Effective responsive web | ✅ Native mobile app, fluid desktop |
Analysis: two well thought-out UX, but...
Claude plays the sobriety card: an ultra-light, fast interface that gets straight to the point. Perfect for professionals who want content, not decorum.
But it's still very basic: no structured history, no favourites, no customisation 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 organise your sessions (rename, pin, share, etc.).
One small downside: it sometimes likes to overdo its responses, with unsolicited suggestions or rephrasing.
👉 To remember
- Claude is focusing on targeted integrations, with a strong emphasis 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 development.
- ChatGPT 4o, on the other hand, is part of an extensible ecosystem. Thanks to Microsoft Copilot, Zapier and its third-party plugins, it can be used with almost any business tool: CRM, ERP, emailing, design, project management, etc. Connectivity is a real strength.
When to choose Claude or ChatGPT 4o?
You don't need 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 you need to process complex data, long documents or sensitive documents. 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, health, insurance: need for rigour, confidentiality, ethical alignment.
It's also ideal if you're already using Slack, Notion or Zoom and want to integrate a discreet but highly effective AI.
✅ In short: choose Claude when rigour and legibility take precedence over creativity.
If you need versatility, interactivity and creative tools...
➤ choose ChatGPT 4o
ChatGPT 4o is designed for professionals who want a multitasking assistant, connected to their tools and capable of creating content on the fly. It's the logical choice for :
- Marketing & communications: 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 is no absolute winner, just the right tool in the right place.
To sum up:
- 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 and 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, synthesise 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 use |
| 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 a beginner to pick up?
✅ ChatGPT 4o: its interface is intuitive, the suggestions are well thought out, and the user experience is very fluid from the first few 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).
Teams and Enterprise packages are also available for businesses.
Does Claude offer a free version?
Yes, Claude is available free of charge via claude.ai with the Claude 3 Sonnet model, which is effective for most text uses.
The premium Opus model is reserved for professional use 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 academic, for this type of use.
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 should you choose for legal or financial use?
📚 Claude without hesitation.
Its handling of legal language, its prudence, and its ability to synthesise 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 and complex data.
Claude remains irreplaceable when precision and clarity of reasoning are priorities.
Article translated from French