Same Voice, Different Businesses

AI writing tools — ChatGPT, Claude, Gemini — have a default voice. It’s fluent, professional, helpful, and generic. When you ask them to write a LinkedIn post, a case study, or an email campaign without specific voice guidance, they produce something that sounds exactly like every other business using the same tool.

That’s not a criticism of the tools. It’s a description of how they work. And for most businesses that have started using them without thinking about this, it’s already a problem.

Why the default voice is the wrong voice

AI models are trained on text from across the internet. The “default” output is essentially a median of professional writing. It reads as competent and inoffensive and interchangeable. For a commodity product, that might be acceptable. For a professional services firm or a complex B2B business whose differentiation depends on how it communicates — its point of view, its sector expertise, its directness or warmth — the default voice actively undermines positioning.

The businesses that are most harmed by this are the ones whose value proposition lives in their distinctiveness. If your firm is known for being unusually direct, or for translating technical complexity into plain language, or for taking positions your competitors avoid — the default AI voice erases all of that. It replaces your voice with a voice that belongs to no one.

The visible symptom

A business that uses AI for content without voice guidance will start to sound like every other business in its sector using AI. Social posts share the same rhythm. Emails use the same framing. Even thought leadership pieces start to blend. Clients and prospects may not be able to articulate why the content feels thin, but engagement drops and the sense that the brand has a distinct point of view erodes.

The symptom is subtle at first. The content is still technically fine — no spelling errors, no factual mistakes, decent structure. But the thing that made the business worth paying attention to goes quiet. Over time, that has a real effect on how the firm is perceived and whether people seek it out specifically, or just encounter it incidentally.

What the solution actually is

The solution isn’t to avoid AI tools — it’s to give them specific, documented voice guidance before they generate anything. This is what a Voice Brief does. A Voice Brief is a short document that captures how the business actually speaks: the vocabulary it uses and avoids, the register (formal or informal, direct or discursive), the things it cares about and the positions it holds.

We go into this in more detail in our piece on what a Voice Brief actually is.

When AI tools are given a Voice Brief as context, the output is recognisably different — not because the AI has changed, but because it now has a specific constraint to work within. The same model that produces generic professional content in response to an open prompt will produce something far closer to the business’s actual voice when it’s told exactly what that voice sounds like. The tool doesn’t change; the input does.

This applies to review responses too

One of the most visible places where AI voice inconsistency shows up is review responses. A firm using generic AI to respond to Google reviews ends up with responses that sound like every other firm’s. They’re polite, generic, and forgettable — and the people reading them notice. Prospective clients who look at reviews aren’t just reading what past clients said; they’re reading how the firm responded. Generic responses signal that no one specific was paying attention.

Our piece on why generic AI review responses are damaging your reputation covers this specific case in more detail.

Common questions

Does giving AI a voice brief actually change the output significantly?

Yes, noticeably. The same prompt with and without voice guidance produces substantially different outputs. With a detailed brief specifying vocabulary, register, what to avoid, and example phrases the business actually uses, AI-generated content starts to sound like it came from the business rather than from a language model with professional settings. The brief doesn’t need to be long — two pages of specific, concrete guidance is usually enough.

What’s the difference between a brand guidelines document and a Voice Brief?

Brand guidelines typically cover visual identity, logo usage, typography, and colour. A Voice Brief is specific to language: the words the business actually uses in conversation, the rhythm of its sentences, what it would never say, how it explains complex things, and what it cares about enough to state directly. The two documents can coexist — they cover different things.