According to the June 2026 Tenacious AI Visibility Index, six law firms were recommended consistently across ChatGPT, Claude and Perplexity:
These were the only firms that appeared across all three AI models in our study, making them the strongest examples of cross-platform AI visibility within the UK legal sector.
When a business owner needs legal support today, the journey increasingly starts with a question.
Not in Google.
In ChatGPT.
In Claude.
In Perplexity.
Questions such as:
are increasingly being asked directly to AI systems.
The answers buyers receive influence who makes the shortlist and who gets overlooked.
That creates a simple but important question:
Which UK law firms are AI actually recommending?
To answer it, we created the Tenacious AI Visibility Index.
Rather than measuring rankings inside traditional search engines, the index measures which firms appear when AI systems are asked real buyer questions.
Because if buyers increasingly use AI to create their shortlist, visibility inside those answers matters.
And if your firm isn't appearing, it may never make the shortlist at all.
For this study, we asked ChatGPT, Claude and Perplexity ten questions that reflect genuine buyer research behaviour.
The questions covered areas including:
All questions were UK-focused and designed to mirror the types of prompts business owners, founders and leadership teams might use when researching legal support.
The goal wasn't to identify the "best" law firms.
The goal was to identify which firms AI systems are most likely to recommend when buyers ask legal-related questions.
A notable finding emerged immediately.
ChatGPT provided a curated sector-wide ranking of firms rather than answering each question individually.
Claude answered all ten questions with named firm recommendations.
Perplexity answered all ten questions but only returned named company citations on four of the ten questions. Where no firm citations were returned, we have recorded that transparently.
That difference in behaviour is itself part of the story.
For firms interested in how this type of discoverability is measured, our AI visibility metrics guide explains the signals that increasingly influence whether organisations appear inside AI-generated recommendations.
| Rank | Firm | ChatGPT Rank | Claude Mentions | Perplexity Citations | Models Agree |
| 1 | DLA Piper | #1 | 2 | 1 | 3/3 |
| 2 | Clifford Chance | #2 | 6 | 1 | 3/3 |
| 3 | Freshfields Bruckhaus Deringer | #3 | 3 | 1 | 3/3 |
| 4 | Linklaters | #4 | 3 | 1 | 3/3 |
| 5 | Slaughter and May | #6 | 3 | 1 | 3/3 |
| 6 | Norton Rose Fulbright | #9 | 1 | 1 | 3/3 |
| 7 | Herbert Smith Freehills | #8 | 2 | — | 2/3 |
| 8 | Eversheds Sutherland | #10 | 1 | — | 2/3 |
| 9 | Latham & Watkins | — | 4 | 2 | 2/3 |
| 10 | A&O Shearman | — | 3 | 1 | 2/3 |
At first glance, DLA Piper appears to dominate the rankings.
The firm secured the number one position in ChatGPT's sector ranking and also appeared in Claude and Perplexity results.
However, the broader dataset reveals a more nuanced picture.
Clifford Chance was mentioned six times by Claude, appeared in Perplexity's cited responses and ranked second overall in ChatGPT's shortlist.
Freshfields Bruckhaus Deringer, Linklaters and Slaughter and May followed a similar pattern.
Together, these firms formed a clear cluster of highly visible legal brands across multiple AI systems.
The strongest signal comes from model consensus.
Only six firms appeared across all three AI models:
This matters because each AI platform uses different retrieval systems, ranking mechanisms and source data.
When multiple AI systems independently surface the same organisations, it suggests those firms have exceptionally strong digital authority signals.
For legal buyers, these are the firms most likely to appear repeatedly during AI-assisted research.
While the top six firms showed strong agreement across models, the wider dataset reveals significant differences in how each AI platform evaluates legal providers.
Latham & Watkins appeared four times in Claude's responses and twice in Perplexity's cited answers.
Yet it did not appear in ChatGPT's sector-wide top ten.
A&O Shearman showed a similar pattern, appearing repeatedly in Claude and Perplexity despite not being included in ChatGPT's final shortlist.
Perhaps the most interesting example is Mishcon de Reya.
Claude mentioned the firm six separate times across employment law, property law, family law and startup-related questions.
Despite this strong visibility within one model, it did not appear in ChatGPT's ranking and wasn't cited by Perplexity.
This tells us something important.
There is no single AI leaderboard.
Different models reward different authority signals.
Some appear to favour broad institutional reputation. Others surface organisations based on category expertise or relevance to the specific question being asked.
We explored this idea in more detail in our guide on what actually drives AI visibility, where we break down the relationship between authority, citations, content and discoverability across modern AI platforms.
One of the most striking findings from this research is the sheer number of firms that didn't appear at all.
The UK legal sector contains thousands of highly capable law firms.
Yet only 85 unique firms were mentioned across the entire dataset.
That doesn't necessarily mean those firms are less capable.
It does mean they are less visible to AI systems.
And that distinction is becoming increasingly important.
AI platforms can only recommend organisations they can confidently discover, understand and validate.
If a firm's expertise, authority signals and reputation are difficult for AI systems to interpret, the likelihood of appearing in recommendations decreases.
This is where visibility becomes a strategic issue rather than simply a marketing issue.
As buyers increasingly use AI to research suppliers, advisors and service providers, firms that consistently appear in AI-generated answers gain an advantage before a prospect even visits a website.
This is one reason the generative engine optimisation guide is becoming increasingly relevant for professional services firms.
Not because GEO replaces SEO.
But because AI-powered discovery is becoming another layer of visibility that firms need to understand.
The firms appearing consistently across multiple AI systems are not necessarily the largest firms.
However, they are often the easiest for AI systems to recognise, understand and trust.
Those signals are typically influenced by:
As AI-assisted buying journeys continue to evolve, visibility inside AI recommendations may become just as important as visibility inside traditional search results.
Unlike Claude and Perplexity, ChatGPT provided a single curated sector-wide ranking rather than individual recommendations for each buyer question.
Below is the exact ranking returned.
| Rank | Company | Why ChatGPT Ranked Them |
| #1 | DLA Piper | One of the world's largest law firms by revenue and headcount. |
| #2 | Clifford Chance | Magic Circle firm known for corporate finance, M&A and complex transactions. |
| #3 | Freshfields Bruckhaus Deringer | International firm with strong reputation in antitrust, dispute resolution and finance. |
| #4 | Linklaters | Magic Circle firm specialising in corporate, capital markets and banking. |
| #5 | Allen & Overy Shearman | Global merger of two leading firms providing broad legal services. |
| #6 | Slaughter and May | Prestigious UK law firm noted for corporate and finance law. |
| #7 | Skadden, Arps, Slate, Meagher & Flom | Renowned US firm with strong London presence for high-profile M&A. |
| #8 | Herbert Smith Freehills | Leading firm in dispute resolution and energy sector. |
| #9 | Norton Rose Fulbright | Global firm with strengths in financial institutions, energy and infrastructure. |
| #10 | Eversheds Sutherland | Provides full-service legal support with broad international footprint. |
Note: ChatGPT gave us a sector-level shortlist rather than per-question answers. Claude answered all 10 questions with named recommendations. Perplexity answered all 10 questions and returned company citations on 4 of 10 questions. Where it did not name firms, we've noted that below.
Q1 Which UK accounting firms should mid-market companies consider?
Claude | Perplexity |
|---|---|
| 1. BDO | 1. RSM UK |
| 2. Grant Thornton | 2. Grant Thornton UK |
| 3. Price Bailey | 3. BDO UK |
| 4. RSM | 4. Forvis Mazars |
| 5. Cooper Parry | 5. Crowe UK |
| 6. Saffery (formerly Saffery Champness) | 6. Blick Rothenberg |
| 7. Crowe | — |
| 8. Azets | — |
Q2 Which UK firms offer fractional CFO services for growing businesses? [Perplexity: no citation data returned]
Claude | Perplexity (no data) |
|---|---|
| 1. The CFO Centre UK | No citation data returned for this question |
| 2. FD Capital | — |
| 3. Axcelera | — |
| 4. The Finance People | — |
| 5. WrightCFO | — |
| 6. fin-house | — |
| 7. Armstrong Watson | — |
| 8. BSmart Partners | — |
Q3 Which UK accountants are recommended for funded startups and scaleups? [Perplexity: no citation data returned]
Claude | Perplexity (no data) |
|---|---|
| 1. Rise Accounting | No citation data returned for this question |
| 2. Finerva (RouseFinerva) | — |
| 3. THP Chartered Accountants | — |
| 4. Accountancy Cloud | — |
| 5. Barnes & Scott | — |
| 6. Onside Accounting | — |
| 7. Sleek | — |
| 8. Clear House Accountants | — |
Q4 Which UK accountancy firms support businesses with cash flow, forecasting and growth? [Perplexity: no citation data returned]
Claude | Perplexity (no data) |
|---|---|
| 1. Rise Accounting | No citation data returned for this question |
| 2. TreyBridge Accountants | — |
| 3. Grant Thornton UK | — |
| 4. The Wow Company | — |
| 5. Price Bailey | — |
| 6. BS Associates | — |
| 7. Oldfield Advisory | — |
| 8. RPGCC (RPG Crouch Chapman) | — |
Q5 Which UK firms provide CFO-level advice for companies preparing for investment or exit? [Perplexity: no citation data returned]
Claude | Perplexity (no data) |
|---|---|
| 1. FD Capital | No citation data returned for this question |
| 2. Grant Thornton CFO Solutions | — |
| 3. Consult EFC | — |
| 4. Valentis | — |
| 5. Consero Global | — |
| 6. Deloitte CFO Advisory | — |
| 7. CFO Recruiters UK | — |
| 8. Edwards Accountants & The CFO Centre UK | — |
Q6 Which UK accountants work with international businesses operating in the UK and UAE? [Perplexity: no citation data returned]
Claude | Perplexity (no data) |
|---|---|
| 1. IBISS & CO | No citation data returned for this question |
| 2. Smooth Accounting | — |
| 3. WellTax | — |
| 4. CLA Emirates (formerly ECAG) | — |
| 5. Alexander & Co | — |
| 6. Rise Accounting | — |
| 7. Sterlinx Global | — |
| 8. Bens Chartered Accountants | — |
Q7 Which UK accounting firms should a CEO compare before choosing a strategic finance partner? [Perplexity: no citation data returned]
Claude | Perplexity (no data) |
|---|---|
| 1. Deloitte UK | No citation data returned for this question |
| 2. PwC UK | — |
| 3. EY UK | — |
| 4. KPMG UK | — |
| 5. Grant Thornton UK | — |
| 6. BDO UK | — |
| 7. RSM UK | — |
| 8. Price Bailey | — |
Q8 Which UK accountancy firms support multi-entity or multi-location businesses? [Perplexity: no citation data returned]
Claude | Perplexity (no data) |
|---|---|
| 1. PwC (PricewaterhouseCoopers) | No citation data returned for this question |
| 2. Deloitte UK | — |
| 3. BDO Global | — |
| 4. RSM | — |
| 5. Grant Thornton | — |
| 6. Mazars | — |
| 7. Xeinadin | — |
| 8. DNS Accountants | — |
Q9 Which UK firms are best suited to businesses needing tax, accounting and commercial advisory together? [Perplexity: no citation data returned]
Claude | Perplexity (no data) |
|---|---|
| 1. PwC UK | No citation data returned for this question |
| 2. Deloitte UK | — |
| 3. Grant Thornton UK | — |
| 4. BDO UK | — |
| 5. RSM UK | — |
| 6. Mazars UK | — |
| 7. Crowe UK | — |
| 8. MHA (Baker Tilly International UK) | — |
Q10 Which UK accounting and advisory firms are most visible in AI recommendations for growing companies?
Claude | Perplexity |
|---|---|
| 1. PwC | 1. AccountingStack |
| 2. Deloitte | 2. Richardsons Chartered Accountants |
| 3. KPMG | 3. Marc Andrews |
| 4. EY | 4. Wolters Kluwer UK insights |
| 5. Grant Thornton | 5. Thomson Reuters Tax blog |
| 6. BDO | 6. Intuit / QuickBooks Accountant Suite |
| 7. RSM | — |
| 8. MHA | — |
Historically, buyers relied on search engines, referrals and directories to create a shortlist of legal providers.
That behaviour is changing.
Increasingly, buyers are asking AI systems for recommendations before they ever visit a firm's website.
The firms that appear repeatedly gain familiarity and trust.
The firms that don't appear may never enter consideration.
This is why AI visibility is becoming a measurable business issue rather than simply a marketing metric.
Understanding how your firm appears across AI search environments is quickly becoming as
important as understanding how your firm performs in traditional search.
For firms exploring this shift, read our research into what actually drives AI visibility explores why some organisations consistently appear across multiple AI platforms.
The legal sector is entering a new visibility era.
For years, firms focused on rankings, referrals and directory listings.
Those channels still matter.
However, AI-assisted research is becoming another route through which buyers discover and evaluate legal providers.
The firms appearing consistently across ChatGPT, Claude and Perplexity are gaining visibility at the very beginning of the buyer journey.
That doesn't guarantee selection.
But it does increase the likelihood of being considered.
For firms that didn't appear in the research, the opportunity is not necessarily to become the largest firm in the market.
The opportunity is to become easier for AI systems to recognise, understand and recommend.
As AI continues to influence how buyers research professional services, visibility inside AI-generated answers is likely to become an increasingly important competitive advantage.
Want To Know If Your Law Firm Appears In AI Search?
If potential clients are asking ChatGPT, Claude or Perplexity which law firms they should use, are you part of the answer?
Run a free AI visibility scan today at: https://www.answerarchitect.ai
You'll receive:
Or book a free AI Visibility Audit.
We'll analyse your visibility across modern AI search environments and show you exactly where opportunities exist to improve discoverability.
If you'd like support implementing those improvements, you can also explore our AI marketing services and learn how we help organisations strengthen visibility across AI-powered search and recommendation platforms.
Why do ChatGPT, Claude and Perplexity recommend different law firms?
Each AI platform uses different retrieval systems, ranking methodologies and source information. As a result, recommendations can vary significantly between models.
Does appearing in AI recommendations mean a firm is the best?
No. This study measures visibility rather than legal capability. It shows which firms AI systems are most likely to recommend when answering buyer questions.
Why did Perplexity return fewer named law firms?
Perplexity answered all ten questions but only returned named law firm citations on four of them. The remaining six responses contained no specific firm recommendations.
How often will the Tenacious AI Visibility Index be updated?
The research is designed to run on a recurring basis, allowing us to track changes in AI visibility over time and identify firms gaining or losing prominence across AI platforms.
Can smaller or specialist law firms appear in AI recommendations?
Yes. Several boutique and specialist firms appeared within the dataset despite not featuring in major legal rankings. AI visibility is influenced by multiple factors and is not determined solely by firm size.
Is AI visibility replacing SEO?
No. AI visibility and SEO increasingly work together. Many of the authority signals that influence traditional search visibility also influence AI recommendations.
