Source: https://support.google.com/analytics/answer/13051316

1. In Analytics, go to: Admin » Data display » Channel groups.
2. Copy the standard group.
3. Edit the new group and rename it to ‘AI Tools’.
4. Add a new channel.
5. Channel name: AI Tools
6. Conditions: source » matches regex » enter the below regex

Possible Regex rules to filter AI Tools

From the mentioned source above

^.*ai|.*\.openai.*|.*chatgpt.*|.*gemini.*|.*gpt.*|.*copilot.*|.*perplexity.*|.*google.*bard.*|.*bard.*google.*|.*bard.*|.*.*gemini.*google.*$

From an Analytics specialist

^(?:(?:.*chatgpt.*)|Claude\.ai|quillbot\.com|openai\.com|blackbox\.ai|perplexity(?:\.ai)?|copy\.ai|jasper\.ai|copilot\.microsoft\.com|gemini\.google\.com|(?:\w+\.)?mistral\.ai|(?:\w+\.)?deepseek\.com)$

Combine

^(?:(?:.*ai.*)|.*openai.*|.*chatgpt.*|.*gpt.*|.*copilot.*|.*perplexity(?:\.ai)?.*|.*gemini.*|.*google.*bard.*|.*bard.*|claude\.ai|quillbot\.com|blackbox\.ai|copy\.ai|jasper\.ai|copilot\.microsoft\.com|gemini\.google\.com|(?:\w+\.)?mistral\.ai|(?:\w+\.)?deepseek\.com)$