Anthropic, OpenAI, Google, and Microsoft agree that the harness is the product. They disagree on the price.

Anthropic, OpenAI, Google, and Microsoft agree that the harness is the product. They disagree on the price.

By Janakiram MSV
Publication Date: 2026-04-18 16:40:00

On March 30, Sycamore announced a $65 million seed round to build what its founder calls an operating system for autonomous enterprise AI. On April 8, Anthropic launched Managed Agents in public beta at eight cents per session hour. Seven days later, OpenAI shipped its own model-native harness as an update to the open-source Agents SDK, with no additional first-party runtime fee beyond standard API and tool pricing.

Three moves in sixteen days, each betting on the same observation about the market. The harness is now the product. But the labs disagree, sharply and publicly, on how that product should be sold.

Anthropic has added a separately billed runtime on its own infrastructure. Google and Microsoft have packaged the layer for consumption across sessions, memory, code execution, and tool use. OpenAI is giving the runtime away as open source and charging only for the model and tool calls that already have meters. The category is forming fast, and the business…