Build, Buy, or API: A Practical Framework for AI Capability Decisions

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A software consultancy has outlined a three-gate framework for deciding whether to build, buy, or use an API for AI capabilities, evaluating each option on competitive differentiation, rate of change, and real-world cost at scale. Commodity capabilities such as text generation, transcription, and OCR are best served by hosted APIs from providers like OpenAI or Anthropic, which typically outperform small in-house teams from day one. Buying a dedicated third-party product makes sense when the required capability is a solved problem and maintaining it in-house would distract the team from core product work. Building in-house is justified only when the capability is a genuine differentiator, proprietary data meaningfully changes the outcome, or per-call API costs exceed a subscription at high volume. Regardless of the choice made, the firm recommends designing for flexibility by placing providers behind a switchable interface and monitoring costs closely, since the optimal decision can shift as volumes grow or vendor terms change.

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