ChatGPT vs Gemini vs Copilot: Three Assistants, Three Ecosystems

The Twist: Two of Three Run OpenAI

Microsoft Copilot is powered by OpenAI's GPT-5-class models through Microsoft's partnership with OpenAI. So ChatGPT and Copilot share most of their underlying intelligence. The genuinely different model in this trio is Gemini, Google's own multimodal flagship.

That means the choice is mostly about packaging. ChatGPT is OpenAI's direct product with the newest models and features. Copilot is those models embedded in Microsoft 365 with enterprise data grounding. Gemini is Google's model inside Workspace and Search, at the cheapest API. See the deeper two-way takes: ChatGPT vs Gemini and ChatGPT vs Copilot.

Pricing

Where Each Wins

Pick by Ecosystem

Building on the API? Route Across All Three

For software, the consumer wrappers do not matter. You call the model APIs directly, and the lever is routing per request across OpenAI and Google. A router sends easy prompts to cheap models and hard prompts to the right frontier model.

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.MORPH_API_KEY,
  baseURL: "https://api.morphllm.com/v1",
});

const response = await client.chat.completions.create({
  model: "router-default",  // routes across OpenAI, Google, Anthropic
  messages: [{ role: "user", content: userQuery }],
});

// Long context -> Gemini 3.1 Pro (cheapest, reliable recall)
// Hard reasoning -> GPT-5.5
// Easy request -> cheap mini model
// 40-70% lower cost than a single flagship.

Frequently Asked Questions

Which is best: ChatGPT, Gemini, or Copilot?

Copilot runs OpenAI's models like ChatGPT, so it comes down to ecosystem: ChatGPT standalone, Copilot for Microsoft 365, Gemini for Google and multimodal.

Do ChatGPT and Copilot use the same model?

Largely yes, OpenAI's GPT-5 family. Gemini is Google's own model.

How much do they cost?

All about $20/month individually; Microsoft 365 Copilot is $30/user/month for orgs.

Which is best for work?

Copilot for Microsoft 365, Gemini for Google Workspace, ChatGPT for standalone use.