{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"trend-series","count":3,"filters":{"display":"absolute","from":2026,"metric":null,"markets":["us-ai-assistant-usage"],"to":2026},"summary":{"anchorCount":3,"chartEligibleCount":3,"definitionBlockedCount":0,"marketCount":1,"metricCount":3,"sourceCount":1},"events":[],"guardrail":"Anchor observations are not interpolated annual estimates. Cross-market use remains governed by each market definition contract.","rows":[{"marketId":"mkt-ai-chatbot","marketSlug":"us-ai-assistant-usage","marketName":"AI assistants","sector":"Digital platforms","geography":"United States","metric":"hhi","metricLabel":"Herfindahl-Hirschman Index","metricUnit":"index","year":2026,"value":4804,"displayMode":"absolute","displayValue":4804,"baselineYear":2026,"baselineValue":4804,"chartEligible":true,"exclusion":null,"crossMarketUse":"screen_only","timeSeriesUse":"snapshot_only","metricFamily":"usage_shares","measurementBasis":"StatCounter all-platform AI chatbot usage share","dataStatus":"estimated_public","confidenceLevel":"medium","calculationMethod":"computed_from_public_shares","leaderName":"ChatGPT","participantCount":6,"shareCoverage":100,"sourceId":"statcounter-ai-chatbot-us-2026","sourceName":"AI chatbot market share in United States of America May 2026","sourcePublisher":"StatCounter Global Stats","sourceUrl":"https://gs.statcounter.com/ai-chatbot-market-share/all/united-states-of-america","methodologyNote":"HHI is computed from listed StatCounter percentages, which sum to 100 across tracked assistants.","notes":"Usage share is a public web-analytics proxy and not AI revenue or total user counts.","marketHref":"/markets/us-ai-assistant-usage","explorerHref":"/trends?markets=us-ai-assistant-usage&metric=hhi&from=2026&to=2026","interpretationGuardrail":"Anchor observations are not interpolated annual estimates. Cross-market use remains governed by each market definition contract."},{"marketId":"mkt-ai-chatbot","marketSlug":"us-ai-assistant-usage","marketName":"AI assistants","sector":"Digital platforms","geography":"United States","metric":"cr4","metricLabel":"Four-participant concentration ratio","metricUnit":"percent","year":2026,"value":94.77,"displayMode":"absolute","displayValue":94.77,"baselineYear":2026,"baselineValue":94.77,"chartEligible":true,"exclusion":null,"crossMarketUse":"screen_only","timeSeriesUse":"snapshot_only","metricFamily":"usage_shares","measurementBasis":"StatCounter all-platform AI chatbot usage share","dataStatus":"estimated_public","confidenceLevel":"medium","calculationMethod":"calculated_from_sourced_participant_shares","leaderName":"ChatGPT","participantCount":6,"shareCoverage":100,"sourceId":"statcounter-ai-chatbot-us-2026","sourceName":"AI chatbot market share in United States of America May 2026","sourcePublisher":"StatCounter Global Stats","sourceUrl":"https://gs.statcounter.com/ai-chatbot-market-share/all/united-states-of-america","methodologyNote":"Directly transcribed from StatCounter May 2026 page.","notes":"StatCounter May 2026 U.S. AI chatbot usage share.","marketHref":"/markets/us-ai-assistant-usage","explorerHref":"/trends?markets=us-ai-assistant-usage&metric=cr4&from=2026&to=2026","interpretationGuardrail":"Anchor observations are not interpolated annual estimates. Cross-market use remains governed by each market definition contract."},{"marketId":"mkt-ai-chatbot","marketSlug":"us-ai-assistant-usage","marketName":"AI assistants","sector":"Digital platforms","geography":"United States","metric":"leaderShare","metricLabel":"Leading-participant share","metricUnit":"percent","year":2026,"value":67.13,"displayMode":"absolute","displayValue":67.13,"baselineYear":2026,"baselineValue":67.13,"chartEligible":true,"exclusion":null,"crossMarketUse":"screen_only","timeSeriesUse":"snapshot_only","metricFamily":"usage_shares","measurementBasis":"StatCounter all-platform AI chatbot usage share","dataStatus":"estimated_public","confidenceLevel":"medium","calculationMethod":"largest_sourced_non_aggregate_share","leaderName":"ChatGPT","participantCount":6,"shareCoverage":100,"sourceId":"statcounter-ai-chatbot-us-2026","sourceName":"AI chatbot market share in United States of America May 2026","sourcePublisher":"StatCounter Global Stats","sourceUrl":"https://gs.statcounter.com/ai-chatbot-market-share/all/united-states-of-america","methodologyNote":"Directly transcribed from StatCounter May 2026 page.","notes":"StatCounter May 2026 U.S. AI chatbot usage share.","marketHref":"/markets/us-ai-assistant-usage","explorerHref":"/trends?markets=us-ai-assistant-usage&metric=leaderShare&from=2026&to=2026","interpretationGuardrail":"Anchor observations are not interpolated annual estimates. Cross-market use remains governed by each market definition contract."}]}