ChatGPT vs Claude in accounting: Why firms are getting it wrong

There’s something interesting happening in the accounting industry right now. Almost everyone is using AI… But very few are using it well. I’ve seen it in my own practice, in the firms I work with and even at an AI conference in Sydney rooms full of accountants, all using tools like ChatGPT and  Claude… but with completely different approaches, standards  and levels of understanding. And that’s the real issue. It’s not about whether you’re using AI anymore. It’s about how structured, safe, and scalable your approach is.

First… you need to stay open minded

Before we get into tools and workflows, this matters: Everyone is at a different stage of their AI journey. Some firms are experimenting, some are embedding it into workflows and some are avoiding it altogether.

There’s no “one right way” - but there is a right mindset:

• Stay curious
• Stay cautious
• Stay practical

The problem: No process, no consistency

Most accountants I speak to are using ChatGPT in isolation:

• Writing the odd email
• Summarising documents
• Brainstorming ideas

But there’s no process flow. No rules.
 No structure.
 No consistency across the team. That’s where the risk starts to creep in. Because AI is fast - very fast. But speed without structure? That’s where mistakes happen.

ChatGPT vs Claude: How I actually use them

Here’s the simplest way to think about it in practice:

ChatGPT = Create

Claude = Review

ChatGPT (Create Mode)

Best for:

• Client emails
• Drafting responses
• Quick summaries
• Brainstorming
• Procedure creation

Strengths:

• Fast
• Conversational
• Great for “first draft thinking”
• Strong integrations (Xero workflows, Zapier, etc.)

Claude (Review Mode)

Best for:

• Reviewing large documents
• Financial explanations
• Policy & compliance reading
• Comparing datasets

Strengths:

• Handles long context better
• More structured outputs
• More cautious (which matters in accounting)
• Excellent for “second layer thinking”

And the mistakes I see…

Using AI as a decision maker. This is a bad idea. AI should enhance thinking - not replace it. Think of it like a graduate team member:

• It can draft
• It can assist
• It can speed things up

But you wouldn’t let a junior staff member:

• Sign off on advice
• Make judgement calls
• Work without review

Same logic applies here.

Speed vs Risk: The trade off

Yes, AI makes things faster. But at what cost?

• Inaccurate outputs
• Missed compliance risks
• Inconsistent client communication

And in accounting, that’s not just inconvenient - it’s dangerous. Especially when:

• You’re short staffed
• Deadlines are tight
• Humans are already under pressure

AI can reduce errors…
But only if it’s used properly.

You need rules AND tools

If you take one thing from this article, make it this:

AI without rules is a liability.

Every firm should have:

• Clear usage guidelines
• Defined workflows
• Review processes
• Data handling rules

Because right now, most firms are operating in a grey area.

Security isn’t optional

This is non-negotiable.

Do not:

• Paste confidential client data into AI tools
• Share financials without safeguards
• Assume tools are automatically compliant

Instead:

• Follow Australian cyber laws
• Apply common sense
• Ensure you have cyber insurance
• Consider tools like Practice Protect (we use it - not sponsored, just practical)

And importantly:

• Get legal advice if you’re unsure

Because once data is exposed - you can’t undo it.

The missing piece: Training your AI

This is where most firms fall down. They use AI… but they don’t train it. To make AI truly effective:

• You need consistent prompting frameworks
• You need to refine outputs
• You need to “teach” it how your firm works

And here’s the key: If something changes - retrain it. Just like you would with a staff member. Because that’s essentially what this is:

• A digital team member
• That needs onboarding
• Ongoing training
• And clear expectations

There are now entire roles now dedicated to training AI models - that tells you how important this is.

AI is incredible. But it’s not magic. The firms that will win are not the ones using it the most…
They’re the ones using it the smartest.

That means:

• Structured workflows
• Clear rules
• Proper training
• Human oversight

Because at the end of the day… This isn’t about replacing accountants. It’s about future-proofing how we work. You can view all our AI webinars here.

ChatGPT vs Claude webinar: