Kagi maintains an update-to-date list of bangs[1]:

- Kagi redirects bang searches even if you are not a member/logged in

- ChatGPT: https://kagi.com/search?q=!chatgpt+test

- Grok: https://kagi.com/search?q=!grok+test

- Copilot (sadly copilot no longer accepts queries from the url params): https://kagi.com/search?q=!copilot+test

- there are internal Kagi bangs for Gemini: https://github.com/search?q=repo%3Akagisearch%2Fbangs+gemini...

- no redirect bang yet for Gemini; you can open an issue and/or pull request

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[1]: https://github.com/kagisearch/bangs

This is easily remediated with maybe one or two keyboard inputs in most browsers.