Market profileAI assistantsHHI 4,804 · 2026 · Estimated

U.S. generative AI assistant usage

Digital platforms· United States · 2026

A public-interest profile for showing where market power is measurable, where public data is missing, and what government should require next.

Structure snapshot

Published firm-share composition

Open shares

ChatGPT67.1%

01 ChatGPT67.1%02 Google Gemini10.9%03 Microsoft Copilot10.8%04 Claude6.0%

HHI position4,804 · Highly concentrated

HHI: 4,804
CR4: 94.8%
Leading share: 67.1%

Latest evidence2026 · Estimated Profile JSONOpen scoped endpoint CSVExport rows Build briefReview packet

Concentration on the HHI scale

ChatGPT alone holds 67% of this market. That makes it highly concentrated on the HHI scale — past the 2,500 line of the 2010 merger guidelines, and well past the 1,800 line the agencies' 2023 Merger Guidelines use.

4,804

1,5002,500CompetitiveMonopoly

Ranks #4 of 12 tracked markets by HHI.

Evidence atlas

Source to public action route

100%

Public coverage6 share rows

Live evidence packetMetric routed4,804 routes through public methodology

Reusable rows121 sources, 6 share rows

Public actionImmediate reviewTest whether the dominant firm controls access, switching, pricing, defaults, distribution, or other chokepoints that weaken consumer choice.

Data

2026

Estimated

Packet

12 rows

1 core source

Action

Immediate review

HHI 4,804

Public stake

Digital platforms

Concentrated markets turn everyday access into private leverage.

Evidence posture

Estimated

12 reusable rows across 1 core source.

Government duty

Immediate review

Test whether the dominant firm controls access, switching, pricing, defaults, distribution, or other chokepoints that weaken consumer choice.

HHI

4,804

Highly concentrated

Top firm

67.13%

Market share

CR4

94.80%

Top 4 firms

Data status

Estimated

Based on public shares

Confidence

Medium

Methodology limits

Review flags

Immediate review

Source-backed concentration profile

StatCounter reports May 2026 AI chatbot usage shares for the United States.

Observatory market brief

AI assistants: highly concentrated in the latest public screen.

The latest 2026 screen reports HHI 4,804, classified as highly concentrated. ChatGPT leads the sourced distribution at 67.1%. The four largest named participants account for 94.8%. The profile currently has one comparable concentration snapshot, so no direction is assigned.

Latest structure

HHI 4,804

The latest 2026 screen reports HHI 4,804, classified as highly concentrated. ChatGPT leads the sourced distribution at 67.1%. The four largest named participants account for 94.8%.

Published change

No comparable series

The profile currently has one comparable concentration snapshot, so no direction is assigned.

Evidence custody

3 custody records

3 records in the evidence custody chain, 6 latest share rows, 2 linked official records, and 2 related briefs support this profile. Status is estimated public with medium confidence.

Comparison window

Series status

2026 evidence

The profile currently has one comparable concentration snapshot, so no direction is assigned.

Measured-market context#4 of 8latest sourced HHI rank

Public research question

Does the observed usage structure persist in revenue, switching, access, quality, and conduct evidence under a legally relevant market definition?

Immediate review

Test whether the dominant firm controls access, switching, pricing, defaults, distribution, or other chokepoints that weaken consumer choice.Open public-action route

Market-definition contract

Read the boundary before the metric.

This profile’s concentration claims apply only to the product, geography, denominator, and measurement basis documented below.

Public proxymedium confidence2026 basis

Product boundary

Consumer generative AI assistant usage across StatCounter-tracked assistants

Geographic boundary

United States

Measurement basis

StatCounter all-platform AI chatbot usage share

Denominator

The tracked assistant shares reported by StatCounter for the monthly snapshot

Included

The assistants listed in the StatCounter share table

Excluded

AI revenue, total users, enterprise use, model supply, chips, and cloud infrastructure

Cross-market use

Screen only

Time-series use

Snapshot only

Method note

Compute HHI only from the listed StatCounter percentages for the same U.S. monthly usage snapshot.

The usage series is a public web-analytics proxy and does not represent the broader AI supply chain or revenue concentration.

Boundary source

AI chatbot market share in United States of America May 2026

StatCounter Global Stats · accessed 2026-06-23

Declared economy screen / navigation only

NAICS 518210 / Computing infrastructure providers, data processing, web hosting, and related services

2022 national industry HHI withheld; this does not redefine or validate the market above.

Industry screen Open crosswalk

Comparison guardrail

The same 0-10,000 HHI scale does not make different product, geographic, or denominator definitions economically interchangeable. Cross-market HHI is a descriptive screen only.

Evidence timeline

Follow the profile from source record to public action.

Each profile should read like an inspectable research route: source access, concentration metric, participant table, official policy chronology, briefing, and the government question it creates.

Open data rows

Full route

Metrics, sources, reports, and action posture.

Events

Rows

Sources

Gaps

Latest evidence: Research brief · Five Digital Gateways

Full route packet

Profile, metrics, participant rows, sources, and reports for the selected market.

10 events

JSON CSV

Full route packet ready: citation, API, CSV, JS, and Python handoffs.

Profile JSONName, geography, sector, score, and current concentration fields.1 market Definition contractProduct boundary, geography, denominator, proxy status, and permitted comparison uses.1 definition ObservationsHHI values, methods, status, and confidence levels.1 row ParticipantsFirm and aggregate share rows behind the profile.6 rows SourcesPublisher, citation, access date, and license notes.3 rows Policy eventsOfficial complaints, decisions, remedies, inquiries, and reports.2 events

Research brief2026 · ReportFive system histories, exact share rows, official product-attribution paths, and a public research agenda with every denominator kept separate.Antitrust Radar Research brief2026 · ReportA source-backed state-of-competition briefing across markets, industries, state systems, local banking screens, mergers, and enforcement, with every system kept in its own analytical universe.Antitrust Radar agency report2026 · SourceFTC Staff Report on AI Partnerships and Investments StudySource ledger agency report2026 · SourceDepartment of Justice Wins Significant Remedies Against GoogleSource ledger public dataset2026 · SourceAI chatbot market share in United States of America May 2026Source ledger Immediate review2026 · ActionTest whether the dominant firm controls access, switching, pricing, defaults, distribution, or other chokepoints that weaken consumer choice.Action center HHI 4,8042026 · ObservationUsage share is a public web-analytics proxy and not AI revenue or total user counts.StatCounter Global Stats

Peer comparison atlas

Read this market against nearby evidence.

Strong public profiles are navigable. This view connects the current market to sector peers, concentration peers, and disclosure-gap peers using the public metrics already in the observatory. Node size follows published HHI; withheld HHI uses the smallest marker.

Compare these profiles Full rankings

All peers: Show every selected peer route.

Peers 4Avg HHI 5,335Gaps 0Node size Published HHI

Comparison readout

Compared

Same sector

Data gaps

5,335

Avg peer HHI

Peer profiles

Social referralsSector peer4,995HHI Mobile operating systemsSector peer5,337HHI Search enginesSector peer7,359HHI Individual insuranceConcentration peer3,650HHI

Current market

AI assistants

4,804

HHI

67.1%

Top

94.8%

CR4

Participant shares

United States · 2026 · StatCounter Global Stats

6 sourced rows

ChatGPT

67.13% share · rank 1 · Estimated from public data · medium confidence

StatCounter Global Stats

Tile area is proportional to each firm’s sourced market share.

ChatGPT

67.13%

Public estimate

Google Gemini

10.86%

Public estimate

Microsoft Copilot

10.79%

Public estimate

Claude

5.99%

Public estimate

Perplexity

5.18%

Public estimate

DeepSeek

0.05%

Public estimate

#	Participant	Share	Status
1	ChatGPT	67.13%	Estimated from public data
2	Google Gemini	10.86%	Estimated from public data
3	Microsoft Copilot	10.79%	Estimated from public data
4	Claude	5.99%	Estimated from public data
5	Perplexity	5.18%	Estimated from public data
6	DeepSeek	0.05%	Estimated from public data

Longitudinal evidence

Market history studio

Inspect sourced concentration releases and comparable share anchors without interpolating between public observations.

AI assistants / 2026

HHI anchors

discrete public releases

Firm snapshots

comparable share years

Observation span

2026

1 public year

Data sources

unique linked records

Concentration releases

Reported HHI anchor years

Each bar is a sourced release. Missing years remain missing rather than being drawn as a continuous trend.

2026 selected

1,800 review level2,500 high-concentration levelSelected release

StatCounter Global Stats. Discrete public anchors only; missing years are not interpolated.

Selected release

2026

United States

Public estimate

HHI

4,804

Prior anchor

First anchor

Leading firm

ChatGPT

Share coverage

100.0%

Publisher: StatCounter Global Stats
Confidence: Medium confidence
Method: computed from public shares
Rows: 6 participant rows

Usage share is a public web-analytics proxy and not AI revenue or total user counts.

JSON rows CSV export Source record

Evidence & public action

Review basis and public action

Keep HHI, firm shares, trend, and evidence quality separate so researchers can inspect why this market is routed for review.

Review posture

Immediate review

Confidence

Medium confidence

Exact flags

3 visible

Screening rule

Review posture uses published concentration thresholds, trend direction, and evidence status as separate signals. It does not estimate consumer harm or establish legal liability.

Public implication

Test whether the dominant firm controls access, switching, pricing, defaults, distribution, or other chokepoints that weaken consumer choice.

Evidence still needed

Comparable multi-year observations

HHI 4,804 (>= 2,500)67.1% top firm (>= 35%)94.8% CR4 (>= 60%)

Data provenance

Methodology: Compute HHI from listed StatCounter percentages, which sum to 100 across tracked assistants; label as estimated from public data.

Limitations: Usage share is a public web-analytics proxy and not AI revenue or total user counts.

AI chatbot market share in United States of America May 2026

StatCounter Global Stats

public dataset

StatCounter Global Stats, AI Chatbot Market Share in United States Of America, May 2026.

Accessed Jun 23, 2026Source URL

Field citation

Reusable market claim

AI assistants (United States, 2026): HHI 4,804; CR4 94.8%; top-firm share 67.1%; estimated public data; medium confidence; action posture: Immediate review.

JSON CSV

Packet ready: citation, API, CSV, JS, and Python handoffs.

Government ask

Test whether the dominant firm controls access, switching, pricing, defaults, distribution, or other chokepoints that weaken consumer choice.

Market rowus-ai-assistant-usage Definitionpublic proxy Observations1 Participants6

Coverage console

A compact audit of whether the profile has enough public evidence to support action.

Watchlist ready

Freshness2026Latest source access Jun 23, 2026

Coverage100%6 of 6 latest rows include shares

API routes7Filtered public JSON endpoints for reuse

Source mix1public dataset

Source mix

1 sources

public dataset1

Hardening watch

Refresh shares when the source table updates

Keep residual categories auditable

Monitor conduct, access, and switching-cost evidence

Public evidence packet

Jump from this market profile to the filtered machine-readable rows behind the public claim.

12 rows

Market rowDefinition, geography, review posture, and latest concentration metricsus-ai-assistant-usage DefinitionProduct boundary, geography, denominator, comparison rules, and source basispublic proxy ObservationsYearly HHI records, status labels, and method notes1 ParticipantsFirm and aggregate share rows used for CR and top-firm screens6 Trend seriesDefinition-aware HHI, CR4, and leading-participant trend rows2 anchors SourcesPublisher, citation, access date, and coverage records1 ReportsResearch brief metadata, source basis, and related market links2

Browse all public datasets

Source basis

This profile relies on public records and clearly labeled limitations.

StatCounter Global StatsAI chatbot market share in United States of America May 2026Jun 23, 2026

View all sources

Methodology & limitations

Market: AI assistants
Geography: United States
Data vintage: 2026
Usage share is a public web-analytics proxy and not AI revenue or total user counts.

Read full methodology

Research actions

Read the sourceAI chatbot market share in United States of America May 2026 Related reportThe U.S. Competition Landscape Review methodologyTest residual-share assumptions and threshold references Export source notesOpen the machine-readable public data tables in the repository

View all reports

Source confidence

lowmediumhigh

Compute HHI from listed StatCounter percentages, which sum to 100 across tracked assistants; label as estimated from public data.

Read the full methodology

Keep exploring

Other tracked markets — Digital platforms first, then the most concentrated.

All markets

Digital platforms

Source to public action route

Does the observed usage structure persist in revenue, switching, access, quality, and conduct evidence under a legally relevant market definition?

Follow the profile from source record to public action.

Read this market against nearby evidence.

AI assistants

Participant shares

ChatGPT

Google Gemini

Microsoft Copilot

Claude

Perplexity

DeepSeek

Reported HHI anchor years

2026

Review basis and public action

Data provenance

AI chatbot market share in United States of America May 2026

Reusable market claim

Coverage console

Public evidence packet

Source basis

Methodology & limitations

Research actions

Related reports

Source confidence

Keep exploring

Search engines

Mobile operating systems

Social referrals

Individual insurance