CAPEX / OPEX
Accounting distinction between capital expenditure (CAPEX), which creates assets amortized over several years, and operating expenditure (OPEX), consumed immediately. The shift from IT CAPEX to AI OPEX is a major strategic inflection.
The CAPEX/OPEX distinction is a basic accounting split. CAPEX (Capital Expenditure) creates or improves a durable asset; OPEX (Operating Expenditure) funds day-to-day operations without creating one. CAPEX goes on the balance sheet as a fixed asset and is amortized over its useful life, which produces an annual depreciation charge. OPEX is expensed directly in the period's income statement. In technology, the line has moved with software delivery models. Traditional IT (server purchases, perpetual licenses) was mostly CAPEX. SaaS started the shift toward OPEX, but cost often stayed fixed in the short term. Selling LLMs through token-billed APIs (OpenAI, Anthropic, Google) is a sharper break: cost becomes purely variable, strictly proportional to usage, and fixed costs disappear. For a company adopting agentic AI, this full variabilization opens an opportunity (zero cost when unused) and creates a governance risk (spending that is hard to budget and can escalate fast under heavy use). CFOs now manage variable OPEX budgets for AI, separate from the fixed SaaS subscriptions that made up classic IT OPEX.
An insurer that runs automatic claims triage through the GPT-5 API pays only when the agent processes a file (about 0.03 euros per file at spring 2026 pricing). In a claims surge (storm, flood), AI costs explode with volume, with no predefined budget cap. That is a financial governance risk classical CAPEX architectures never had.
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