Mastra

npm install @mastra/core @ai-sdk/openai ai

import { Agent } from "@mastra/core/agent";
import { createOpenAI } from "@ai-sdk/openai";

const phaseo = createOpenAI({
	apiKey: process.env.PHASEO_API_KEY,
	baseURL: "https://api.phaseo.app/v1",
	compatibility: "compatible",
});

export const agent = new Agent({
	name: "support-agent",
	instructions: "Answer in two short paragraphs.",
	model: phaseo("openai/gpt-5-nano"),
});