B
Evidence Grade B
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accuracy verified by the review judge
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Recent
89.4%
89.4% -- chatgpt share of ai sessions for ChatGPT (share of AI platform sessions) (2025)
ChatGPT accounted for 89.4% of total AI sessions across major LLM products from October through December 2025.
- Covers sessions across top LLM products (ChatGPT, Gemini, Perplexity, Grok, Claude) across web and mobile app where available
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
89.4%
Unit
Percentage
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Graphite
Primary
Tier A
https://graphite.io/five-percent/research/ai-is-much-bigger-than-you-think ↗
Source Article
AI Is Much Bigger Than You Think
AI Is Much Bigger Than You Think
Key Takeaways
Monthly sessions of AI are now 56% the size of search worldwide and 34% in the US, 4x-5x larger than previous reports that only include web data.
AI now receives 45B monthly sessions worldwide, and 5.4B monthly visits in the US.
Search-related usage of …
Original Research
Graphite
· Original study ↗
Methodology
ChatGPT share of combined AI platform sessions (web + app); Graphite notes error rate from compositional differences across AI products should be relatively low given this dominance
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
ChatGPT (share of AI platform sessions): 89.4% chatgpt share of ai sessions. Source: Graphite (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/chatgpt-share-of-ai-sessions-89-4pct
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<blockquote cite="https://lighthousedata.io/data/chatgpt-share-of-ai-sessions-89-4pct" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>89.4%</strong> -- chatgpt share of ai sessions for ChatGPT (share of AI platform sessions)<br><small>Source: Graphite (2025) · <a href="https://lighthousedata.io/data/chatgpt-share-of-ai-sessions-89-4pct" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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