Which AI Tools Are Professional Services Firms Using for Marketing? Claude vs ChatGPT vs NotebookLM -

Are you a founders, MDs, CEOs, partner or and marketer in professional services firms that’s increasingly experimenting with AI tools? Have you tried one or two, typed several prompts, and quietly wondered whether you are using the most effective tool for marketing tasks.

Accountants, HR consultancies, healthcare providers, education firms, SaaS businesses and their marketing teams are using AI to save time, sharpen their content, and reach the right clients more consistently. The real question is which tool belongs in your workflow, and how to use it well.

Three are worth understanding and trying out: Claude, ChatGPT, and NotebookLM.

Context worth knowing

According to the Office for National Statistics, 25% of UK businesses were using some form of AI by late 2025. Among larger firms, that figure rises to 44%. Marketing is the most commonly cited use case among adopters, with 72% of AI-using businesses deploying it there. Skills remain the biggest barrier: nearly two-thirds of UK organisations cite a knowledge gap as the primary reason they are not doing more with AI.

That is a guidance problem, not a technology one. Understanding what each tool does, and does not do, is more valuable than enthusiasm alone.

It helps to think of these three tools as members of a small marketing team. Each has distinct strengths. Knowing which one to call on, and when, is the skill.

ChatGPT is fast, broad, versatile

ChatGPT, built by OpenAI, is the tool most people try first, and for good reason. It is capable, fast, and broad in what it can tackle.

For professional services marketing, it is well suited to:

First drafts of blog posts, email campaigns, and social media posts
Brainstorming campaign ideas, content themes, and messaging angles
Repurposing content, such as turning a webinar transcript into five LinkedIn posts
Writing in different tones of voice, whether a formal white paper or a friendly client newsletter.

In practice: An accounting firm launching a year-end tax planning campaign could prompt ChatGPT to generate five email subject lines, a short introductory paragraph, and a list of common client questions. An hour’s preparation, reduced to ten minutes.

Its limitation is depth. ChatGPT is a generalist trained on a vast pool of public data. It does not know your firm, your clients, or your brand voice unless you tell it. Without careful prompting, outputs can feel generic. It also has no memory between separate conversations, so context needs to be re-established each time.

Claude is considered, precise, contextually aware

Claude, built by Anthropic, is designed to reason carefully, handle long and complex documents, and engage with nuance. Where ChatGPT is broad, Claude is considered.

Anthropic describes Claude as “a space to think,” built for deep work rather than quick outputs. There are no adverts, no commercial incentives shaping its responses, and no sponsored content appearing alongside your conversation. It is a clear, uncluttered space to work through complex problems, with an assistant whose only purpose is to be genuinely helpful. For a firm wrestling with how to articulate its value clearly and accurately, that matters.

For professional services marketing, Claude is particularly strong at:

Long-form content requiring nuance, such as thought leadership articles, capability statements, and case studies
Reviewing and improving existing content, identifying gaps in tone, clarity, or argument
Strategic thinking, such as defining an ideal client profile or planning a content calendar for the next quarter
Analysing lengthy documents, including reports, research papers, or client briefs, and surfacing the key points quickly
Sensitive or complex messaging, where accuracy and tone both matter, such as healthcare communications or HR policy content.

In practice: An HR consultancy writing a guide on workplace mental health could use Claude to develop a structured, carefully argued piece, balancing legal accuracy with empathy, section by section.

Claude also handles large amounts of context well. Paste in a lengthy document, your existing website copy, or a competitor’s content, and Claude can analyse, compare, or build on it. That makes it a useful thinking partner for tasks that go beyond generating text.

NotebookLM is your private research and knowledge tool

NotebookLM, built by Google, is the most distinct of the three. It is not primarily a content generator. It is a knowledge organiser.

Upload your own documents, and NotebookLM works exclusively within those sources. It will not invent information or draw on general knowledge. Every response is grounded in what you have given it.

For professional services firms, this makes it particularly useful for:

Synthesising research, such as combining several industry reports to identify relevant market trends
Client intelligence, by uploading meeting notes, proposals, and feedback to identify recurring themes
Pitch and presentation preparation, by loading background documents and asking focused questions
Content gap analysis, by uploading existing blog posts and asking what topics have not yet been covered
Audio briefings, one of NotebookLM’s more distinctive features: it can generate a podcast-style summary of uploaded documents, useful for quickly briefing a team.

In practice: A SaaS firm preparing a quarterly marketing review uploads three months of campaign reports, client feedback, and competitor analysis, then asks NotebookLM to summarise the key themes and suggest priorities. Analysis that could take a full day is completed in a focused session.

The constraint is that NotebookLM only knows what you give it. It cannot generate ideas from nothing or write a blog post from scratch. It works best when you have existing material and need help making sense of it.

Choosing the right tool for the task

Rather than asking which tool is best overall, it is more useful to ask which tool suits the specific task.

Task	Best AI Tool
Writing first drafts quickly	ChatGPT
Long-form thought leadership and strategy	Claude
Research, analysis and document synthesis	NotebookLM
Reviewing and refining existing content	Claude
Brainstorming and idea generation	ChatGPT or Claude
Making sense of your own client data	NotebookLM
Sensitive, nuanced communications	Claude

Professional services firms find that all three in combination work best:

ChatGPT for speed and breadth.
Claude for depth, quality and strategic thinking.
NotebookLM for making sense of what you already know.

Here are a couple of analogies to highlight the benefits of each tool:

The professional team
Think of the AI tools like a well-run project team. ChatGPT is the junior associate, fast and eager, great for getting a first draft on the table. Claude is the senior consultant, measured and precise, the one you bring in when the thinking needs to be sharper. NotebookLM is the research analyst, head down in your documents, surfacing the insight hidden in the detail.

The financial toolkit
Think of the AI tools in comparison to the tools an accountant reaches for at different stages of a job. ChatGPT is the spreadsheet template: fast to set up, broadly useful. Claude is the senior partner reviewing the numbers: precise, experienced, catches what others miss. NotebookLM is the client file: it only knows what is in it, but when you need to find something, it is invaluable.

Using AI effectively

AI tools are accelerants, not replacements for human insight and expertise. They work best when you bring clear thinking, well-constructed prompts, and your own expertise to the conversation.

In professional services, reputation is everything. AI can help you produce more, faster. The judgement, the voice, and the client relationships that inform what you say remain yours.

Used well, these tools give time back. Time to focus on the conversations, the thinking, more productive meetings and the relationships that grow a firm.

Using AI more strategically in your marketing

Starting small works well: one task, one AI tool, one experiment that you can assess and improve upon before trying another approach. The results often speak for themselves.

If you would like to explore how AI-enhanced marketing could work for your firm specifically, whether you run an accountancy practice, HR consultancy, healthcare business, or SaaS company, get in touch.

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Sources and further reading