ChatGPT vs Gemini vs Copilot (2026): Pricing, Message Limits, and Models Compared

The Twist: Two of Three Run GPT-5.5

Microsoft Copilot's Smart mode uses GPT-5, and GPT-5.5 Instant is rolling out to Copilot Chat through Microsoft's partnership with OpenAI. That is the same GPT-5.5 family behind ChatGPT. So ChatGPT and Copilot share most of their underlying intelligence. The genuinely different model in this trio is Gemini 3.1 Pro, Google's own multimodal flagship.

The choice is mostly packaging. ChatGPT is OpenAI's direct product with the newest models and features. Copilot embeds those models in Word, Excel, Outlook, and Teams with tenant data grounding. Gemini is Google's model inside Workspace and Search with a 1M-token context window. See the two-way takes: ChatGPT vs Gemini and ChatGPT vs Copilot.

Pricing: Every Tier, Side by Side

All three individual plans land at roughly $20/month. The free tiers and the cheaper paid steps differ: ChatGPT Go is $8/month, Google AI Plus is $4.99/month, and Copilot has no sub-$20 paid step.

Message and Usage Limits

This is where the three diverge most. ChatGPT meters by message count on a rolling window. Gemini and Copilot meter by compute, factoring in prompt complexity and features used. The exact published caps:

Gemini app limits factor in prompt complexity, features used, and chat length, refresh every 5 hours until the weekly limit, then shift you to smaller models. ChatGPT free is the tightest hard cap: 10 GPT-5.5 messages every 5 hours.

Models and Benchmarks

GPT-5.5 is the latest GPT model live in ChatGPT (June 2026) and the model Copilot runs. Gemini 3.1 Pro is Google's flagship. Published benchmark scores:

GPT-5.5 leads on coding-agent benchmarks (58.6% SWE-Bench Pro, 82.7% Terminal-Bench 2.0). Gemini 3.1 Pro leads on ARC-AGI-2 abstract reasoning (77.1%, more than double Gemini 3 Pro on that benchmark) and on context length. GPQA Diamond is close across both families.

Feature Matrix

Data and Training Defaults

All three train on consumer chats by default, and all three let you opt out. The mechanics differ:

Turning off ChatGPT model training applies to the whole account on every device and can be changed anytime. For Gemini, audio, Gemini Live videos, and screenshares are not used to improve services by default; human-reviewed chats are disconnected from the account and kept for 3 years.

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 (1M tokens, reliable recall)
// Coding-agent work -> 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 GPT-5.5 like ChatGPT, so it comes down to ecosystem: ChatGPT standalone, Copilot for Microsoft 365, Gemini 3.1 Pro for Google Workspace, multimodal, and a 1M-token context window.

Do ChatGPT and Copilot use the same model?

Yes. Copilot's Smart mode uses GPT-5 and GPT-5.5 Instant is rolling out to Copilot Chat, the same OpenAI family behind ChatGPT. Gemini is Google's own model.

What is ChatGPT's free message limit?

10 messages with GPT-5.5 every 5 hours on Free. Plus and Go allow 160 messages every 3 hours, then switch to the mini model until reset.

How much do they cost?

ChatGPT Plus $20, Copilot Pro $20, Google AI Pro $19.99. ChatGPT Go is $8 and Google AI Plus is $4.99 below those.

Which has the largest context window?

Gemini 3.1 Pro on Google AI Pro, at 1M tokens (about 1,500 pages or 30K lines of code).

Which is best for work?

Copilot for Microsoft 365, Gemini for Google Workspace, ChatGPT for standalone use with the newest OpenAI features.

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