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You can repoint clients in Vercel’s AI SDK through Butter using its createOpenAI function, which accepts the necessary base URL and headers. See it in the example below. 
import { generateText } from "ai"
import { createOpenAI } from "@ai-sdk/openai"

const openai = createOpenAI({
    baseURL: "https://proxy.butter.dev/v1",
    headers: {"Butter-Auth": `Bearer ${process.env.BUTTER_API_KEY}`},
    apiKey: process.env.OPENAI_API_KEY

});

const { response } = await generateText({
    model: openai("gpt-4o"),
    prompt: "What is the English word for mantequilla?"
});

console.log(response.messages[0].content[0].text);