— Recommended01 / 06
01claude
Claude
- Anthropic — reasoning & reliability
- Writing, design, code, Cowork
- Best balance of quality and security
- Ideal for everyday professional use
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Business guide · Overview · All the AIs
Which AI
to choose?
Claude, ChatGPT, Copilot, Gemini, Grok, Mistral: understand the strengths of each generative AI and choose the right tools for your business, role by role.
06ai
Tools
compared
compared
Claude
IIA
recommendation
recommendation
−60%
Writing
time
time
— Overview
The AIs to know in business
— General-purpose02 / 06
02gpt
ChatGPT
- OpenAI — the best known to the public
- Versatile, rich ecosystem (GPTs)
- Good for brainstorming & content
- Easy team adoption
— Built into Microsoft03 / 06
03copilot
Microsoft Copilot
- Built into Word, Excel, Outlook, Teams
- Ideal if you use Microsoft 365
- Native enterprise-grade security
- Adoption without changing tools
— Google ecosystem04 / 06
04gemini
Gemini
- Google — built into Gmail, Docs, Sheets
- Excellent for search & multimodal
- Good for analysing large documents
- Ideal if you use Google Workspace
— Real time05 / 06
05grok
Grok
- xAI — connected to the news (X)
- Direct tone, monitoring & trends
- Useful for social media & monitoring
- Ecosystem still young
— Sovereignty06 / 06
06mistral
Mistral
- French — EU hosting
- Relevant under strict GDPR constraints
- Lightweight, open-weight models
- Fast-growing ecosystem
— 01 Claude
Claude · Anthropic
— Why we recommend it first
- Reliable reasoning — long, complex instructions followed well, few hallucinations on provided documents.
- 4 built-in tools — Chat, Design, Code and Cowork cover almost all office uses.
- Security & confidentiality — enterprise standards, data not used for training.
- Writing quality — professional tone at the first attempt, little editing needed.
— How to use it
- Access it via claude.ai, the desktop/mobile app or the API.
- Describe the need and the business context precisely.
- Upload documents, code or data for a contextualised result.
- Iterate through dialogue until you get the result you want.
— Executives / HR
Writing & summarising documents
Use case: Reports, meeting minutes, summary notes from long documents.
Result: Writing time divided by 3 to 5, instant professional quality.
— Developer / Product
Code, prototypes & documentation
Use case: Code generation, debugging, interface mock-ups, technical documentation.
Result: Development 2 to 3× faster, prototypes in hours rather than days.
Give the business context
Sector, desired tone, constraints: the richer the context, the better the result.
Upload your documents
PDFs, code, transcripts: Claude works directly on your content.
Iterate, don't accept the first draft
"More concise", "more formal tone": it is a back-and-forth, not a single order.
— 02 ChatGPT
ChatGPT · OpenAI
— Why use it
- The most widespread — teams already familiar with it, little resistance to change.
- GPTs ecosystem — custom assistants for recurring tasks.
- Good for brainstorming — ideas, creative angles, marketing content.
- Image generation — quick visuals within the conversation.
— How to use it
- Access it via chat.openai.com, the app or the API.
- Create dedicated GPTs for your recurring processes.
- Upload files and images for richer context.
- Check outputs on factual or numerical topics.
— Marketing
Content & brainstorming
Use case: Campaign ideas, article drafts, quick visuals.
Result: Faster content production, rapid creative iterations.
— Customer support
A GPT built on a knowledge base
Use case: A custom GPT fed with the FAQ and product documentation.
Result: First-level answers automated, support team relieved.
Create business GPTs
One GPT per recurring process (standard contracts, support replies…).
Check the figures
Always cross-check factual data before sharing.
Separate work and personal use
Use a Team/Enterprise account for data confidentiality.
— 03 Copilot
Microsoft Copilot
— Why use it
- Native integration — directly in Word, Excel, Outlook, Teams, PowerPoint.
- No change of tool — the team stays in its usual environment.
- Enterprise security — inherits the Microsoft 365 security policies already in place.
- Good with Office data — email summaries, Excel tables, PowerPoint decks.
— How to use it
- Turn on Copilot in your Microsoft 365 licence.
- Use it directly in the Word/Excel/Outlook side panel.
- Ask for automatic Teams meeting summaries.
- Train teams on the commands specific to each app.
— Executive assistant
Managing emails & meetings
Use case: Automatic Teams meeting summaries, sorting and replying to Outlook emails.
Result: Less admin time, minutes ready at the end of the meeting.
— Finance / Management control
Analysing Excel tables
Use case: Complex formulas, trend analysis, visualisations on large tables.
Result: Analyses produced in minutes rather than hours.
Prioritise it if you use Microsoft 365
The best choice if the company is already on this ecosystem.
Train app by app
Copilot behaves differently in Word, Excel or Teams.
Clean up your source data
Answer quality depends directly on your Office files.
— 04 Gemini
Gemini · Google
— Why use it
- Built into Google Workspace — Gmail, Docs, Sheets, Slides, Meet.
- Strong at multimodal — analysing images, videos and large volumes of documents.
- Up-to-date search — connected to Google search in real time.
- Long context — processes very large documents in one go.
— How to use it
- Access it via gemini.google.com or directly in Gmail/Docs.
- Use it to summarise long threads or shared documents.
- Use image/video analysis for visual content.
- Combine it with Google Sheets for data analysis.
— Monitoring & research
Up-to-date information summaries
Use case: Competitive monitoring, summaries of recent industry news.
Result: Up-to-date information without changing search tool.
— Document analysis
Processing large volumes
Use case: Analysing 100+ page reports, extracting key data.
Result: A summary in minutes on very large documents.
Prioritise it if you use Google Workspace
The best choice if the company uses Gmail/Docs/Sheets every day.
Use multimodal
Images, screenshots, videos: Gemini analyses them directly.
Useful for large documents
Prefer it when the volume of text exceeds what other tools handle well.
— 05 Grok
Grok · xAI
— Why use it
- Connected to X in real time — relevant for monitoring and social trends.
- Direct tone — less formatted answers, useful for quick brainstorming.
- Useful for social media — understanding the topics rising in real time.
- Young ecosystem — to consider as a complement, not as the only tool.
— How to use it
- Access it via the X app or grok.com.
- Ask it about current events or recent trends.
- Use it to capture the tone of online discussions.
- Cross-check sensitive information with a reliable source.
— Community management
Trend monitoring
Use case: Quickly identify topics rising on social networks.
Result: More responsive social content, better aligned with the news.
— Communications
Real-time reputation monitoring
Use case: Quickly spot brand mentions and the tone of discussions.
Result: Faster response when a sensitive topic emerges.
Complementary use
Use it as a support for monitoring, not as your main writing tool.
Cross-check sensitive information
Real-time sources need extra verification.
Suited to social media teams
Less relevant for writing official documents.
— 06 Mistral
Mistral AI
— Why use it
- French/European player — data hosting and governance in the EU.
- Relevant in regulated sectors — health, public sector, strict GDPR constraints.
- Open-weight models — self-hosting possible for sensitive cases.
- Growing ecosystem — Le Chat, API, integrations under continuous development.
— How to use it
- Access it via Le Chat (chat.mistral.ai) or the Mistral API.
- Consider self-hosting for the most sensitive data.
- Use it where sovereignty constraints apply.
- Complement it with another tool for the most advanced needs.
— Public / regulated sector
Compliance & data sovereignty
Use case: Processing sensitive data that requires European hosting.
Result: Using generative AI with no compromise on GDPR compliance.
— CIO / IT
Custom deployment
Use case: Self-hosting an open-weight model on internal infrastructure.
Result: Full control over data, costs under control at scale.
Prefer it under strong GDPR constraints
Public sector, health, legal: Mistral meets specific requirements.
Assess self-hosting
Relevant if your IT department wants to keep control of the infrastructure.
Complementary, not exclusive
Combine it with Claude or ChatGPT for uses not subject to these constraints.
— Comparison
Which AI for which need?
| AI | Vendor | Key strength | Ideal for |
|---|---|---|---|
| Claude | Anthropic | Reliability, writing, code, security | Everyday professional use |
| ChatGPT | OpenAI | Versatility, custom GPTs | Brainstorming, content |
| Copilot | Microsoft | Office 365 integration | Companies already on Microsoft |
| Gemini | Multimodal, up-to-date search | Companies on Google Workspace | |
| Grok | xAI | Real-time news and trends | Monitoring, social media |
| Mistral | Mistral AI | Sovereignty, EU hosting | Regulated sectors, strict GDPR |
— Next
Next steps
— Diagnosis01 / 04
01
Needs audit
- Mapping uses by job
- Existing ecosystem (Microsoft, Google…)
— Selection02 / 04
02
Choosing the tools
- 1 or 2 priority AIs depending on constraints
- Balancing cost / security / use
— Training03 / 04
03
Building skills
- Training by team and by use
- Practical cases on your real data
— Adoption04 / 04
04
Gradual roll-out
- Team by team, with dedicated support
- Tracking gains & adjustments
— Next / 08
Ready to equip your organisation?
— FAQ
Frequently asked questions
Should we choose a single AI for the whole company?
Not necessarily. Many companies combine a general-purpose tool (Claude or ChatGPT) with one built into their office suite (Copilot or Gemini). The key is to avoid spreading yourself across too many tools at once.
Do these AIs replace the work of teams?
No. They increase capacity on repetitive tasks (writing, summarising, basic code) and free up time for strategy, customer relations and creativity.
What about data security and confidentiality?
Each vendor offers enterprise plans with confidentiality commitments (data not used for training). Requirements vary by sector: Mistral and Copilot are often preferred under strict GDPR constraints. Check the contractual details with your IT team.
What is the overall cost for a company?
Most of these AIs offer a free or trial tier, then paid per-user plans (from a few euros to a few tens of euros per month). Copilot and Gemini are often included in, or add-ons to, existing licences (Microsoft 365, Google Workspace).
How long does it take to train a team?
Getting started takes half a day per tool. Mastering advanced uses (complex prompts, automations, workflows) builds up over several weeks, through real use cases.
Who can I contact for support or training?
IIA helps companies choose, deploy and train on generative AI, whatever tool you pick. Contact us for a diagnosis suited to your organisation.