Hi @arshia !
Currently there is no support for web search via API.
If you would like to try search via API, the simplest is to use Perplexity AI’s “online” suite of models (see here).
The alternative is to implement some kind of a search + GPT-4o combo yourself from scratch, by e.g. combining either Bing API with GPT-4o (see here), or using Serpapi with GPT-4o.