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Using ChatGPT for tax research? Nylon vs ChatGPT for New Zealand accountants
ChatGPT is OpenAI’s general AI assistant, with web search, file uploads, deep research and a free plan. If you use it for tax research, compare where its answers come from, how you check them, what happens to your clients’ data and what you pay. Here’s how Nylon compares, how to use the two together, and when ChatGPT is still the better fit.
Nylon vs ChatGPT: the short answer
As at 24 October 2026. Nylon’s prices are in New Zealand dollars. ChatGPT’s are OpenAI’s US list prices before tax; OpenAI says it offers localised pricing, so you may see New Zealand dollars. Details and sources below.
ChatGPT
Nylon
Answers from
Its training, plus the web when search runs
New Zealand legislation, Inland Revenue guidance, and court and tribunal decisions
Citations
With search, may be included; OpenAI says they can be incomplete, outdated or incorrect
Every answer cites and links the primary source
Model training
Free, Go, Plus, Pro: on unless you opt out. Business, Enterprise: off by default
Your inputs are never used, on any plan
Price before tax
Free plan; Plus US$20 a month; Business Standard US$20–$25 per user a month
$39–$199 per user a month, ex GST
Breadth
Any topic, with deep research, file uploads and apps
Tax and law, with drafting and document review
Choose Nylon for tax answers cited to New Zealand legislation, Inland Revenue guidance and case law. Choose ChatGPT if you mainly want a general assistant for drafting and everyday work. Or use both: with an Adviser or Elite seat, Nylon’s connector brings its research into ChatGPT, where your ChatGPT plan allows it.
Each vendor’s own website is the source for its column.
ChatGPT alternatives for tax research at a glance
What each product says about itself on its own website, as at 24 October 2026. Prices exclude GST unless stated.
Nylon
Cited AI answers from New Zealand primary sources, in Nylon or your AI assistant
Yes, on every plan
$39, $99 or $199 per user a month
CCH iKnowConnect
The New Zealand Master Tax Guide, CCH commentary and practical tools
Yes
$1,045.19–$5,792.68 a year incl. GST, for 1 user (new customers)
Thomson Reuters Checkpoint
Specialist-written commentary and compliance guidance
Not described on its New Zealand product page
Quote-based
Lexis+ with Protégé
Broad legal research, with CaseBase citation checks
Yes
Quote-based
Cassandra Research
A low per-seat price and research across 23 jurisdictions, including New Zealand
Yes
A$45 or A$99 per seat a month, plus GST
Claude, Gemini or Copilot on their own
Quick drafting where nobody needs to trace the source
When they search the web
Free and paid plans
Why choose Nylon over ChatGPT for New Zealand tax research
As at 24 October 2026. ChatGPT is quick, broad and good at drafting. Nylon is built for tax answers you can trace to the law, and it works inside ChatGPT too.
Answers from New Zealand law
Nylon answers from New Zealand legislation, Inland Revenue guidance, and court and tribunal decisions, and links each citation to the source. ChatGPT answers from its training and, when search runs, the web. OpenAI’s help centre says search results and citations “can be incomplete, outdated, or incorrect”.
Benchmarked against GPT-6 Astra
In Nylon’s October 2026 benchmark of 91 Australian tax questions from CPA Program Australia Taxation, Nylon scored 4.68 out of 5 and OpenAI’s GPT-6 Astra 4.28. GPT-6 Astra ran through OpenAI’s API with the benchmark’s shared web-search tool, not the ChatGPT app, and was limited to 20 tool calls per question; the Claude and Gemini models had no limit.
Never used for training
Nylon never uses your inputs to train AI models, on any plan. On ChatGPT’s Free, Go, Plus and Pro plans, OpenAI may use your chats to train its models unless you turn off “Improve the model for everyone”. Business and Enterprise workspaces aren’t used for training by default.
Keep ChatGPT, add Nylon
Adviser and Elite seats include Nylon’s AI connector for ChatGPT, so ChatGPT can search Nylon’s library and cite the source. Your ChatGPT plan and workspace settings decide whether you can add it.
1. Nylon
Nylon: cited AI answers from New Zealand primary sources
Nylon answers tax and law questions from New Zealand legislation, Inland Revenue guidance, and court and tribunal decisions, and links every citation to the source.
Cited answers
Every answer comes with hyperlinked citations to the primary source.
New Zealand library
New Zealand legislation, Inland Revenue guidance, and decisions from New Zealand courts and tribunals.
Drafting and review
Draft advice letters, research memos and tax opinions, or upload client documents and ask what matters.
In your AI tools
Adviser and Elite seats include Nylon’s AI connector for Claude, ChatGPT and Microsoft Copilot.
Pricing
Starter $39, Adviser $99 and Elite $199 per user per month, ex GST. Billed monthly; cancel anytime. Enterprise pricing on request.
Nylon
When does a person become a New Zealand tax resident?
A person is a New Zealand resident if they have a permanent place of abode in New Zealand, even if they also have one elsewhere [1]. They’re also resident once they’ve been present for more than 183 days in total in a 12-month period, backdated to the first of those days [2].
1
Income Tax Act 2007, s YD 1(2)
2
Income Tax Act 2007, s YD 1(3) and (4)
Illustrative example
Benchmark · October 2026
4.68 / 5
Nylon’s composite score on 91 CPA Program Australia Taxation questions, each graded by an AI judge against an expert reference answer, without being told which system wrote it.
Nylon
4.68
Claude Fable 5.1
4.32
GPT-6 Astra
4.28
Australian tax, compared with five general AI models run through their providers’ APIs from 28 September to 1 October 2026. OpenAI’s two models were limited to 20 tool calls per question; Claude and Gemini had no limit. The ChatGPT app and specialist tools weren’t tested.
Nylon vs ChatGPT, side by side
As at 24 October 2026. The ChatGPT column comes from OpenAI’s website and help centre.
Where you use it
ChatGPT, with apps for services such as Google Drive, Slack and SharePoint. Apps that connect to internal tools need Plus or above.
Nylon on the web, and Claude, ChatGPT and Microsoft Copilot through the AI connector (Adviser and Elite).
Contract
Plus and Pro: monthly, renewing automatically; cancel anytime. Business: monthly or annual, minimum 2 seats; annual seats stay committed for the term.
Monthly. Cancel anytime.
Price (before tax)
Free plan. Plus US$20 a month; Pro from US$100 a month. Business Standard US$25 per user a month, or US$20 billed annually. Enterprise: contact sales. US prices; OpenAI says prices may vary by country.
$39, $99 or $199 per user a month, ex GST. Enterprise: quote.
What answers draw on
The model’s training, the web when search runs, and your uploaded files and connected apps. A curated New Zealand tax library isn’t described on OpenAI’s public pages.
Nylon’s library: New Zealand legislation, Inland Revenue guidance, and decisions from New Zealand courts and tribunals.
Citations
Answers that use web search “may include citations”, which OpenAI says “can be incomplete, outdated, or incorrect”. Deep research reports include citations or source links.
Every answer links each citation to the primary source.
Model training
Free, Go, Plus and Pro: OpenAI may train on your chats unless you opt out in Data controls. Business, Enterprise and Edu: not used for training by default.
Your inputs are never used to train AI models, on any plan.
Jurisdictions
Any topic and any country, from the model’s training and the web.
New Zealand, Australian and UK tax legislation and guidance in one library.
Tools
Deep research, projects, document uploads up to 512 MB a file, and apps.
Deep research on Adviser and Elite. Drafts advice letters, research memos and tax opinions, and reviews uploaded client documents.
Security
Business: SOC 2 Type 2. Enterprise and Edu: also ISO/IEC 27001 and 27701. OpenAI also lists ISO/IEC 42001 for its AI management system.
SOC 2 Type 1, SOC 2 Type 2, ISO 27001, ISO 42001
Try before you buy
Free plan.
Book a demo to test Nylon on your own questions.
What you gain with Nylon
Answers cited to New Zealand legislation, Inland Revenue guidance and case law
Inputs never used to train AI models, on every plan
New Zealand, Australian and UK tax legislation and guidance in one library
Nylon inside ChatGPT, Claude and Microsoft Copilot (Adviser and Elite)
What you give up
ChatGPT’s free plan, and Plus at US$20 a month
A general assistant for writing and tasks on any topic
ChatGPT’s apps for services such as Google Drive, Slack and SharePoint
Test Nylon on your own ChatGPT questions
Bring three tax questions you asked ChatGPT this month. In the demo, we’ll run them in Nylon so you can check each answer against its sources.
Other ChatGPT alternatives for tax research
Each summary comes from the product’s own website, as at 24 October 2026.
2
CCH iKnowConnect
Wolters Kluwer’s tax and legal research platform, with the New Zealand Master Tax Guide, CCH commentary and built-in AI: AI-Powered Q&A, an AI Assistant and AI-generated summaries, with citations.
Best for
Firms whose work runs on the Master Tax Guide and CCH commentary.
Pricing
$1,045.19, $2,106.93 or $5,792.68 a year incl. GST for 1 user, up to $11,585.34 for 3 users. These are Wolters Kluwer’s online packages for new customers, on a 12-month minimum term that renews automatically. 4+ users: quote.
Consider it if
You want expert commentary and practical tools alongside AI answers.
3
Thomson Reuters Checkpoint
Thomson Reuters’ online tax and accounting information service for New Zealand: legislation, commentary and compliance requirements, written by tax, accounting and legal specialists and often updated within 24 hours of a change.
Best for
Firms that want specialist-written commentary from another publisher.
Pricing
Quote-based: single titles, your own pack or a practice area package. Free demo, or a trial, on request.
Consider it if
You want human-written commentary more than AI answers. Its New Zealand product page doesn’t describe AI answers.
4
Lexis+ with Protégé
LexisNexis’s legal AI for research, drafting and analysis, formerly Lexis+ AI. Its answers are grounded in LexisNexis content, with CaseBase citation checks.
Best for
Law firms, barristers and in-house teams doing broad legal research.
Pricing
Quote-based; free demo on request.
Consider it if
Your work is mostly legal rather than tax. Its New Zealand pages are written for legal professionals rather than accountants.
5
Cassandra Research
An Australian AI tax and legal research workspace covering 23 jurisdictions, with a New Zealand tax engine for income tax, GST and Inland Revenue procedure. Its tax products are for registered tax agents, BAS agents, Australian legal practitioners and other approved trained professionals.
Best for
Advisers who want a low per-seat price and research across many countries.
Pricing
Pro A$45 and Elite A$99 per seat a month, plus GST (Australian dollars). 14-day free trial of up to 25 questions.
Consider it if
You research well beyond New Zealand, Australia and the UK.
6
Claude, Gemini or Copilot on their own
General AI assistants from Anthropic, Google and Microsoft. Like ChatGPT, they answer from their training and, when they use it, web search.
Best for
Quick drafting and orientation where nobody needs to trace the answer.
Pricing
Free and paid plans.
Consider it if
You add Nylon’s AI connector to Claude or Copilot (Adviser and Elite), so they search Nylon’s library and cite the source.
Which should you choose?
As at 24 October 2026. Match the tool to the work you do most.
If you want cited answers from New Zealand tax law
Nylon
In Nylon, or in ChatGPT, Claude and Copilot with an Adviser or Elite seat. Billed monthly.
If you want to keep working in ChatGPT
Use both: Nylon inside ChatGPT
With an Adviser or Elite seat, add Nylon’s connector where your ChatGPT plan and workspace settings allow it. ChatGPT then searches Nylon’s library and cites the source.
If you mainly draft, summarise and brainstorm
ChatGPT
A general assistant for any topic, with a free plan.
If your work runs on publisher commentary
CCH iKnowConnect or Checkpoint
The New Zealand Master Tax Guide and specialist-written commentary.
If your work is mostly legal
Lexis+ with Protégé
Broad legal research with CaseBase.
If you research across many countries
Cassandra Research
It covers 23 jurisdictions, including New Zealand.
Security your firm can check
Nylon is SOC 2 Type I and Type II audited, and ISO 27001 and ISO 42001 certified.
Independently audited
SOC 2 Type I and Type II reports are available, and Nylon holds ISO 27001 and ISO 42001 certification.
Encrypted
All data that passes through Nylon is encrypted in transit and at rest.
Not used for training
Your inputs are never used to train AI models.
Admin controls
Every plan includes advanced organisational controls.
Baqir Hussein, FCCA · Founder & Director, Finex Chartered Certified Accountants (UK)
Nylon vs ChatGPT: frequently asked questions
Questions about using Nylon with ChatGPT? Book a demo or email support@usenylon.com.
Can I use ChatGPT for tax research?
Yes, for orientation and first drafts, if you check what it tells you and protect client confidentiality. As at 24 October 2026, OpenAI’s terms say you shouldn’t rely on its output “as a sole source of truth or factual information, or as a substitute for professional advice”. Inland Revenue’s interpretation statement IS 26/04 (March 2026) says that for a complex tax question, it “would not be taking reasonable care to use a single prompt to a general-purpose artificial intelligence system and rely solely on its response”. Whichever AI tool you use, Nylon included, it says reasonable care involves checking trusted sources such as legislation, case law and Inland Revenue guidance, and reviewing the output. Nylon links every answer to the source it relies on, so you can check it.
Is ChatGPT accurate for tax questions?
OpenAI says ChatGPT “can make mistakes”, and no AI tool is error-free, Nylon included. Nylon’s October 2026 benchmark tested Australian tax, not New Zealand tax: on 91 CPA Program Australia Taxation questions, run from 28 September to 1 October 2026, OpenAI’s GPT-6 Astra scored 4.28 out of 5 and GPT-6 Sol 3.96, against 4.68 for Nylon. Both ran through OpenAI’s API, not the ChatGPT app, with the benchmark’s shared web-search tool and no system prompt. They were limited to 20 tool calls per question, unlike the Claude and Gemini models; GPT-6 Sol hit that limit on 52 of the 91 questions and GPT-6 Astra on 7, so their scores may understate them, and ChatGPT’s results may differ. As at 24 October 2026, OpenAI says GPT-6, powered by GPT-6 Sol, is rolling out as the default in ChatGPT’s Chat for eligible Plus, Pro, Business and Enterprise users.
What is the best alternative to ChatGPT for tax research?
If you want cited answers from New Zealand primary sources, Nylon: it links every answer to the legislation, Inland Revenue guidance or decision, never uses your inputs to train AI models, and works inside ChatGPT with an Adviser or Elite seat, where your ChatGPT plan allows it. If your work runs on publisher commentary, CCH iKnowConnect or Thomson Reuters Checkpoint. For broad legal research, Lexis+ with Protégé. For research across many countries, Cassandra Research.
Does ChatGPT use my clients’ data to train its models?
It depends on the plan. As at 24 October 2026, OpenAI says it may use content from its individual plans (Free, Go, Plus and Pro) to train its models, unless you turn off “Improve the model for everyone” in Data controls or use a Temporary Chat. It doesn’t train on Business, Enterprise or Edu workspace content by default. Nylon never uses your inputs to train AI models, on any plan.
How does ChatGPT pricing compare with Nylon?
As at 24 October 2026, OpenAI lists ChatGPT Plus at US$20 a month and Pro from US$100 a month. ChatGPT Business Standard seats cost US$25 per user a month, or US$20 billed annually, with a 2-seat minimum. These are US prices before tax, and OpenAI says prices may vary by country. There’s also a free plan. Nylon costs $39, $99 or $199 per user a month ex GST, billed monthly. If you keep ChatGPT and add Nylon, you pay for both.
Can I try Nylon before I buy?
Book a demo to see Nylon answer your own questions. Plans are monthly and you can cancel anytime. ChatGPT has a free plan.
Can I use Nylon in ChatGPT, Claude or Copilot?
Yes, with an Adviser or Elite seat, if your assistant’s plan and workspace settings allow connectors. Nylon’s AI connector lets those assistants search Nylon’s library and cite the source.
Is Nylon secure enough for client work?
Nylon is SOC 2 Type I and Type II audited, and ISO 27001 and ISO 42001 certified. Data is encrypted in transit and at rest, and your inputs are never used to train AI models.
Keep exploring
Nylon for accountants
Research, drafting and review for accounting firms.
Tax research benchmark
91 Australian tax questions, six systems, graded against expert answers.
Nylon for ChatGPT
Cited Nylon research inside ChatGPT.
Plans
Starter, Adviser and Elite, billed monthly.
Apart from Nylon’s own benchmark, information about ChatGPT and the other products comes from their own websites as at 24 October 2026 and can change. Prices are in New Zealand dollars unless marked A$ or US$. ChatGPT, GPT and OpenAI are trade marks of OpenAI, and other product names belong to their owners. Nylon isn’t affiliated with or endorsed by OpenAI or any of those owners. Nylon’s October 2026 benchmark tested Australian tax. It ran OpenAI’s GPT-6 Astra and GPT-6 Sol through OpenAI’s API, not the ChatGPT app, with a limit of 20 tool calls per question that the Claude and Gemini models didn’t have, and didn’t test the other products on this page. Spotted something out of date? Email support@usenylon.com.