OpenRouter

https://openrouter.ai/docs/features/web-search

https://openrouter.ai/docs/overview/models

XAi

https://docs.x.ai/docs/guides/live-search

https://docs.x.ai/docs/api-reference#create-new-response

https://docs.x.ai/docs/api-reference#chat-completions

OpenAPI

https://platform.openai.com/docs/api-reference/chat/create

https://platform.openai.com/docs/guides/tools-web-search?api-mode=chat

https://platform.openai.com/docs/guides/tools