Buy when an existing product fits the workflow and operating requirements. Adapt when available tools need configuration, approved information, or a different handoff. Build when distinct requirements justify the additional ownership. Compare all three routes against the same brief, representative tasks, total costs, access controls, maintenance responsibilities, and ability to change direction.
Choosing an AI solution is also a decision about how your organisation will operate it. A subscription, a configured workflow and a custom application create different responsibilities for your team. The right choice depends on the work, the information involved and the value of doing something differently.
We recommend comparing three routes against the same business brief: buy an existing product, adapt available tools, or build a custom application. Keep the desired outcome consistent while you examine what each route would require.
Buy when an existing product fits the work
Start by examining capabilities in software your team already uses, alongside relevant specialist products. An existing product may offer a suitable workflow, familiar administration and a supported path for routine updates.
Test the actual fit. Can it use the information your employees need? Does it respect the access boundaries you require? Can reviewers inspect the result and correct it? What happens when a request does not fit the product’s normal process?
A feature list is useful for shortlisting. A representative task is more useful for deciding whether the product supports your way of working. Record the changes your business would need to make to use it successfully.
Adapt when the pieces exist but the workflow differs
Adaptation might involve configuring an assistant, connecting approved information sources, changing prompts or linking existing tools. It can be appropriate when a standard product comes close but needs a particular handoff, output format or review stage.
Make the remaining responsibilities visible. Someone still needs to maintain the configuration, manage access, update source material and check that changes have not affected the result. A workflow assembled from available tools needs an owner just as a custom application does.
Ask the delivery team to explain which parts are standard, which are configured and which contain custom logic. That distinction helps you understand where support will come from and what knowledge your own team needs.
Build when the distinct requirements justify ownership
A custom application can make sense when the required workflow, integration or user experience cannot be met adequately through existing options. It may also be justified when the capability is central to how the business serves its customers.
Building an application does not necessarily mean training a model. A delivery team may build around existing model services and concentrate on information access, workflow, evaluation and the interface people use. Google Cloud’s application development guidance describes prompt design and additional customisation as separate considerations, and notes that further model customisation may be unnecessary when prompts already produce suitable responses.
The business still needs a plan for ongoing ownership. Ask who will support integrations, test updates, investigate failures and maintain documentation after the initial delivery team leaves.
Compare the complete working arrangement
Use a common set of questions for every option. This keeps a polished product presentation and a custom development proposal comparable.
- Workflow fit: Which parts of the job are supported, and what remains manual?
- Information: Which sources are accessible, and how are they kept current?
- Quality: How will the option be tested on your work, including exceptions?
- Control: Who can change the behaviour, inspect activity and stop an action?
- Operating effort: Who will maintain, review and support it?
- Cost: What are the setup, usage, integration, support and internal time commitments?
- Change: How difficult would it be to move information or the workflow elsewhere?
Distinguish confirmed capabilities from planned features and assumptions. Where an important answer is uncertain, request a targeted test rather than treating the uncertainty as resolved.
An illustrative comparison
Consider a fictional distributor that wants sales staff to prepare answers to product questions. A feature in its existing software might be sufficient for summarising account notes. Answering detailed compatibility questions could require a maintained product reference source and a specialist review step.
The team should first establish whether an available product can support that source and review process. If it can, configuration may be enough. If it cannot, a custom interface or integration may be worth investigating. The decision turns on the missing capability and its value, rather than a general preference for buying or building.
Record why the chosen route is appropriate
Write a short decision record: the outcome sought, alternatives considered, evidence gathered and responsibilities accepted. Include the assumptions that would change the decision. This makes the choice easier to revisit when business needs or available products change.
Authentia’s AI strategy work helps leadership compare routes before committing. Our implementation guidance helps the selected client team or delivery partner work from a clear, testable brief.