| Ontology | Central to the model, and a genuine strength | Usually a documentation exercise, rarely executable | Implicit and hard-coded per product | Yours to design, and a long road | Three layers, domain canon you inherit, structure derived from your data, and your rules on top |
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| Time to first working solution | Depends heavily on how much foundation work comes first | Discovery and design phases before software | Fast, within the product's boundaries | Slow, and front-loaded with platform work | Working software in the first workshops; POCs complete by day 60 |
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| Who does the deployment | Vendor engineers, partner SIs, or your own team | Large blended teams, often learning your domain on the engagement | Your team, following the product's model | Your team | Small pods from the company that builds the platform, with domain leads behind them |
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| Cost curve over time | Platform cost plus significant implementation capability | Tends to grow; reuse is not the commercial incentive | Predictable per product; multiplies as you add products | Highest fixed cost, lowest marginal cost if you succeed | Falls with each solution as ontology, connectors and patterns compound |
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| What happens when you leave | Solutions typically depend on the platform | Depends entirely on how the contract was written | You lose the product's capability | Nothing: it's yours | Your ontology, data and solutions are yours; exit path documented before signature |
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| Accuracy | Strong tooling; discipline depends on the implementing team | Varies by team; often asserted rather than measured | Benchmarked by the vendor, on the vendor's data | Whatever you build for yourself | SME-owned golden sets, regression on every release, the number published |
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| Best when | You have scale, budget and a strong internal platform team | You need very broad change management alongside the technology | Your problem is exactly the problem the product solves | AI is core to your product and you can hire for it | You need production results fast, in a domain with real complexity, without building a platform team first |
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