DeepSeek: DeepSeek API overview docs materially updated

System Baseline: Null

// Please install OpenAI SDK first: `npm install openai` import OpenAI from "openai" ; const openai = new OpenAI ( { baseURL : 'https://api.deepseek.com' , apiKey : process . env . DEEPSEEK_API_KEY , } ) ; async function main ( ) { const completion = await openai . chat . completions . create ( { messages : [ { role : "system" , content : "You are a helpful assistant." } ] , model : "deepseek-chat" , } ) ; console . log ( completion . choices [ 0 ] . message . content ) ; } main ( ) ;