Accounting distinction between capital expenditure (CAPEX) generating assets amortized over several years and operating expenditure (OPEX) consumed immediately, with the shift from IT CAPEX to AI OPEX constituting a major strategic inflection.
The CAPEX/OPEX distinction is a fundamental accounting categorization separating expenditures that create or improve a durable asset (CAPEX, Capital Expenditure) from those that finance current operations without creating an asset (OPEX, Operating Expenditure). CAPEX is recorded on the balance sheet as a fixed asset and amortized over its useful life, generating an annual depreciation charge. OPEX is directly recorded as an expense in the period's income statement. In technology, this distinction has progressively shifted with the evolution of software delivery models. Traditional IT (server purchases, perpetual licenses) was essentially CAPEX. The transition to SaaS initiated a shift toward OPEX, but cost often remained fixed in the short term. The commercialization of LLMs via token-based APIs (OpenAI, Anthropic, Google) represents a more radical break: cost becomes purely variable, strictly proportional to usage, eliminating fixed costs. For companies adopting agentic AI, this absolute variabilization creates both an opportunity (zero cost in the absence of usage) and a governance risk (spending difficult to budget, rapid escalation under intensive use). CFOs must now manage variable OPEX AI envelopes, distinct from fixed SaaS subscriptions that constituted classical IT OPEX.
An insurance company deploying an automatic claims triage system via GPT-5 API only pays when the agent processes a file (approximately 0.03 euros per file at spring 2026 pricing). In a claims surge (storm, flood), AI costs explode proportionally to volume, without a predefined budget cap, constituting a new financial governance risk absent from classical CAPEX architectures.
capital expenditure, operating expenditure, dépense d'investissement, charge opérationnelle, SaaS