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Let's be honest: we were waiting for this model.
For several months, Claude dominated the rankings with 4 models in the top 4 places of the public benchmarks. The question was no longer whether OpenAI would respond, but when.
To avoid picking a side, you can train your teams on ChatGPT and roll out Claude across your teams.
It has happened. On 23 April 2026, OpenAI released GPT-5.5. On paper, it is strong: it beats Claude Opus 4.7 on several benchmarks, notably in coding, logic and complex workflows.
But we won't lie to you: on some points, we were left wanting more.
At AI Sisters, we train teams on both tools every day. This article is our unfiltered analysis to help you choose — or rather, to use the right tool at the right time in your company.
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Why this release really changes the game in 2026
Since late 2025, the market for generative AI in business revolved around one simple question: Claude or ChatGPT?
And the answer leaned clearly towards Claude for demanding uses (long documents, reasoning, confidentiality).
With GPT-5.5, OpenAI rebalances the scales.
And for IT, HR or finance decision-makers who have to decide on an AI rollout this year, that changes three things!
Autonomy on complex tasks: THE real progress
This is the real novelty. You hand over a task in a single instruction (write a report from several sources, analyse a financial file, produce a full benchmark), and GPT-5.5 plans, executes, checks and corrects on its own.
Before, you had to prompt 5 times. Now, a single instruction is enough.
For teams trained in prompt engineering, that is a considerable time saving. For those who are not… it is even more powerful, provided you know how to frame the initial request.
Faster, cheaper
GPT-5.5 solves the same tasks as GPT-5.4 while using fewer tokens.
In practice, it is faster and costs less for the same result.
For a CFO keeping an eye on AI usage costs, that is a concrete argument.
For a CIO planning a rollout to several hundred employees, it is a scalability factor!
Workspace Agents: the new feature that really matters to companies
Probably the most significant feature of this release.
Persistent, shareable agents connected to the company's tools.
You create an agent that automates a process (weekly reporting, competitive monitoring, HR onboarding), you share it with your team, and it runs continuously.
This is exactly the kind of approach we already roll out with our clients during our AgentAthons, as at ENGIE GET!
What leaves us wanting more
We are not going to do OpenAI's sales pitch.
On three key points for companies, GPT-5.5 does not yet beat Claude.
"Computer use" is still lagging behind
GPT-5.5 can navigate interfaces, click and fill in forms.
But honestly, Claude Cowork has been doing this for weeks and the experience is smoother.
OpenAI is catching up, but not yet ahead.
For teams that want to automate processes on internal tools (CRM, ERP, intranets), Claude remains more mature today!
Memory and long context
Claude Opus 4.7 can take in the equivalent of 500 pages in a single conversation and keep it all in mind.
GPT-5.5 is improving, but Claude stays one step ahead on long, complex documents.
For a legal team loading contracts with amendments, or a finance team working on acquisition files, Claude remains the best choice today.
No equivalent to Claude Design
OpenAI has announced nothing that comes close to Claude Design.
If you need to prototype, create mock-ups or produce visuals directly in your AI, Claude has this ground to itself!
ChatGPT shows ads. Claude does not.
This point deserves a closer look, because it has a direct impact on the confidentiality of your data.
Since February 2026, OpenAI has been showing ads in ChatGPT to free users in the United States, Canada, Australia and New Zealand. The ads are selected based on the content of your current conversation.
Anthropic has officially announced that Claude will remain ad-free. They even bought Super Bowl spots with the slogan: "Ads are coming to AI. But not to Claude."
Their position: "There are many good places for advertising. A conversation with Claude is not one of them."
For companies, this is a strong signal.
A tool that monetises your conversations does not have exactly the same interests as you.
■ Confidentiality, performance, ROI: we help you decide
900+ companies supported, 60,000 employees trained. We know both tools inside out.
→ Talk to the AI Sisters team
Our analysis: Claude vs GPT-5.5, which to choose?
We train on both. We test both. We compare them every day.
Here is our honest verdict.
GPT-5.5 takes the lead on:
Claude keeps the lead on:
Our advice: don't pick a side, master both.
+900
companies supported
60,000
employees trained
2
AI ecosystems mastered
Qualiopi
certified training provider
That is the message we have been sharing at AI Sisters for 18 months.
Depending on the task, the best tool is not always the same.
And it changes every month.
A team that has mastered only one tool misses out on 40% of the highest-performing use cases.
Our training covers both ecosystems, and that is what makes the difference on the ground.
■ Train your teams on both AIs, not just one
Training 100% eligible for OPCO funding (French training funds) — tailored to your role-based use cases.
→ Build my tailored training
4 concrete use cases for your teams
To make this less abstract, here are four situations where the arrival of GPT-5.5 really changes the game, and where the choice between the two tools has a direct impact!
Finance / CFO: multi-source quarterly reporting
You have a quarterly report to produce from 5 different files.
Before: you compile, cross-check and format.
Half a day at least.
Now: you give the 5 files to GPT-5.5 (or to Claude for large files), you describe the expected format, and it does the rest!
Legal: analysing a contract and its amendments
You need to analyse a contract and its amendments to identify risky clauses.
Before: line-by-line reading, note-taking, manual summary.
Now: Claude (for volume) or GPT-5.5 (for speed) reads everything, identifies the risks and produces a structured summary note.
In this specific case, Claude remains more reliable on files of more than 200 pages.
Leadership / Strategy: competitive benchmark
You are preparing a competitive benchmark for a leadership committee.
Before: 3 days of research, compiling and formatting.
Now: one clear instruction to GPT-5.5, which searches, compiles, structures and delivers the document!
HR: workforce report or training summary for the leadership team (COMEX)
You need to produce a workforce report or a training summary for the leadership team.
Before: data extraction, cross-referencing tables, PowerPoint layout.
Now: GPT-5.5 or Claude handles the whole chain, from extraction to the final deliverable.
That is exactly what we rolled out with the HR teams at Havas Group!
How to access it in practice
GPT-5.5 is available now on:
- ChatGPT Plus, Pro, Business and Enterprise subscriptions
- GPT-5.5 Pro version reserved for Pro, Business and Enterprise plans
- Gradual integration into Microsoft Copilot for M365 customers
For Claude Opus 4.7, access is via Claude.ai (Pro, Team, Enterprise) or via the API.
The real question is not "which one should I buy?" but "how do I train my teams to use the right tool at the right time?"
That is exactly what we do at AI Sisters: Qualiopi-certified training covering both ecosystems, with concrete role-based use cases for your teams!
FAQ — GPT-5.5 vs Claude at work
Question 1
Does GPT-5.5 really replace Claude at work?
No. GPT-5.5 beats Claude on some benchmarks (coding, agentic workflows, Microsoft ecosystem), but Claude keeps the lead on long documents, computer use, design and confidentiality. The best strategy in 2026 is still to equip your teams with both tools depending on the use case.
Question 2
What is the impact of advertising in ChatGPT on my company?
For the paid Business and Enterprise versions, the impact is limited today. But introducing ads in the consumer version sends a signal about OpenAI's business model. For sensitive data (legal, HR, finance), Claude offers a clearer confidentiality framework, with no advertising monetisation of conversations.
Question 3
Should the whole company subscribe to ChatGPT Enterprise or Claude Team?
It depends on your main use cases. Tech / product / heavy marketing teams: ChatGPT Enterprise is often a better fit. Legal / finance / leadership teams handling long, confidential documents: Claude Team is generally more relevant. Most of our clients roll out both in parallel, for different scopes.
Question 4
How do I train my teams on both tools without overloading them?
With an approach based on role-based use cases, not on tools. At AI Sisters, we start by mapping the 5 to 10 highest-impact use cases in your organisation, then match each one with the right tool (ChatGPT, Claude or both). This lets teams build skills on what really matters, without drowning employees in features.
Question 5
Can AI Sisters training be funded?
Yes. AI Sisters is a Qualiopi-certified training provider: our training is OPCO-fundable and eligible for Skills Development Plan funding. We support our clients in putting together the funding application, from the specifications to the actual funding.
■ The AI battle is back on. Get your teams ready.
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GPT-5.5 has reignited the battle with Claude...
The real win for companies: not picking a side, but training their teams on both!
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