ChatGPT’s custom GPTs, now available as of December 2025, allow Australian businesses to create tailored versions of ChatGPT for specific tasks without needing coding experience. These customisations function as dedicated AI assistants trained on your provided data and instructions, accessible through the ChatGPT interface.
Currently, creating a custom GPT involves using the ‘Create a GPT’ option within ChatGPT Plus. You define its personality, instructions, and knowledge base by uploading files (up to 20MB per file – supporting PDF, TXT, CSV) or linking to external websites. In 2026, OpenAI plans to increase the file upload limit to 100MB and introduce support for more file types, including DOCX and XLSX. The ‘GPT Store’, launched in late 2025, allows creators to share and potentially monetise their GPTs, though Australian GST implications for revenue are still being clarified by the ATO as of December 2025.
These custom GPTs can automate tasks like drafting marketing copy, answering frequently asked customer questions based on your product information, or even analysing sales data. The functionality is accessible to Australian users with a ChatGPT Plus subscription, currently priced at AUD $30 per month. Understanding the limitations of the training data and regularly reviewing the GPT’s outputs remains crucial for ensuring accuracy and relevance.
