{"page":"/blog/openrtb-versions-compared","modified":"2026-11-10","license":"https://creativecommons.org/licenses/by/4.0/","columns":["Signal","OpenRTB 2.5 path","OpenRTB 2.6 path","OpenRTB 3.0 path","Note"],"rows":[["Slot size","imp[0].banner.format[0]","imp[0].banner.format[0]","request.item[0].spec.placement.display.displayfmt[0]","AdCOM renames the format object"],["Floor","imp[0].bidfloor, bidfloorcur","Same","request.item[0].flr, flrcur","Shorter names in 3.0"],["Page category","site.cat with IAB3 (Content Category 1.0, Business)","site.cattax 9 with cat 52 (Content Taxonomy 3.1, Business and Finance)","context.site.cattax, cat","AdCOM marks taxonomies 1 and 2 deprecated"],["Seller account","site.publisher.id","Same","context.site.pub.id","Equals the last schain node's sid"],["Device type","device.devicetype 2","Same","context.device.type 2","2 = personal computer in both lists"],["TC String","user.ext.consent","user.consent","context.user.consent","Same string in all three"],["GDPR flag","regs.ext.gdpr","regs.gdpr","context.regs.gdpr","Omitted means unknown"],["GPP","none","regs.gpp, regs.gpp_sid","context.regs.gpp, gpp_sid","Section 2 carries the EU TCF string"],["Supply chain","source.ext.schain","source.schain","request.source.schain","Same object, version 1.0"],["Extended IDs","user.ext.eids","user.eids","context.user.eids","atype 1 = device or browser ID"]],"sourceUrls":[[],[],[],[],[],[],[],[],[],[]]}