Microsoft <span class="g">Copilot</span> vs ChatGPT Free 2027: Which Is Better?

Microsoft Copilot and ChatGPT are cousins, not strangers: Copilot runs on OpenAI's models inside Microsoft's wrapper, tuned for web-grounded answers and life inside Edge and Windows. But the free tiers differ in meaningful ways — message handling, reasoning modes, image allowances, Office integration and what happens when you hit a limit.

This guide compares the free tiers only, as they stand in October 2026. Microsoft reshuffled its Copilot lineup in 2026 — the old $20/month Copilot Pro is retired, the apps merged, and the paid path now runs through Microsoft 365 — so we will untangle that too. Every claim below was checked against October 2026 overviews; where a number is reported rather than officially published, we say so.

Free Tier at a Glance

Microsoft Copilot's free tier needs no paid Microsoft 365 subscription. You get general AI chat, web-grounded answers with citations, writing help, file analysis (up to 20 files per conversation at 50 MB each), the Think Deeper reasoning mode, a Smart mode that adapts depth to the task, and 15 image boosts per day. Basic chat is accessible with very low friction via copilot.microsoft.com; signing in with a free Microsoft account unlocks chat history, longer conversations, voice, image creation and personalisation.

ChatGPT's free tier offers unlimited everyday text chat on the current free model (GPT-6 Luna), a Think option for harder questions, limited file and image uploads, a few image generations per day, limited voice mode, memory across conversations, web search and community-built custom GPTs. It needs a free OpenAI account and may show clearly labelled ads in some markets.

Head-to-Head: The AI Models Underneath

Copilot's free tier runs current GPT-class models with a Smart mode that adjusts reasoning depth automatically, plus an explicit Think Deeper mode for harder problems — which Microsoft says is not usage-limited on free, though paid subscribers get priority when capacity is constrained. In practice, Copilot free feels like a slightly more structured ChatGPT with the web always on.

ChatGPT free serves its own current free model with a Think toggle, and the newest flagship models stay on paid tiers. For pure model quality the two are close on everyday tasks; the difference is packaging, not raw intelligence. Neither free tier will embarrass itself on writing, summarising or general questions.

Head-to-Head: Web Search and Research

Copilot's signature strength is that web grounding is always on: answers routinely cite sources, and the Edge sidebar can summarise the very page you are reading. If your work is research-heavy — checking facts, comparing products, summarising articles — Copilot free is arguably the better tool, and it asks nothing of you to start.

ChatGPT free includes web search too, but it is a mode you invoke rather than the default posture, and citation discipline is looser. ChatGPT's paid tiers add Deep Research for long investigations; Copilot's old Deep Research was retired for free users in August 2026, with its Researcher replacement reserved for Microsoft 365 Premium. For cited everyday research on a free tier, Copilot edges it.

Head-to-Head: Reasoning and Hard Problems

Both free tiers now include an explicit reasoning mode: Copilot's Think Deeper and ChatGPT's Think. Microsoft's statement that Think Deeper is not usage-limited on the free tier is unusually generous — it means long, careful reasoning chains without a visible counter, with only capacity-based slowdowns for free users. ChatGPT's Think is available on free but sits inside the broader rationing of the tier's extras.

For maths, logic and multi-step problems, try both on your actual workload: Copilot's web grounding helps when the answer benefits from current information, while ChatGPT's memory helps when the problem builds on your earlier context. Neither replaces a paid reasoning model for genuinely hard work.

Head-to-Head: Images, Voice and Files

Copilot free includes 15 image boosts per day — a clear, published number — plus file uploads and voice once signed in. ChatGPT free includes roughly a few image generations per day, limited voice mode and file uploads with tighter per-day allowances. On paper Copilot's image allowance is the more transparent of the two; in practice both cover casual use and ration heavy use.

The bigger split is files: Copilot's stated 20-files-per-conversation, 50 MB each allowance is generous for document analysis on a free tier. ChatGPT free allows uploads but with visibly tighter daily rationing. If your workflow is document-heavy, Copilot free deserves the first look.

Head-to-Head: Memory, Customisation and Ecosystem

ChatGPT wins this round outright. Memory across conversations, custom GPTs built by the community, scheduled tasks and a large app ecosystem make the free tier feel like a personal assistant that learns. Copilot free offers personalisation once signed in but nothing comparable to memory or custom GPTs; its ecosystem advantage is elsewhere — inside Windows and Edge, where it is built into the OS and browser rather than a destination site.

Office integration deserves a clear statement because it confuses people: the free Copilot tier does not work inside Word, Excel or PowerPoint at all. Copilot in Office apps requires a paid Microsoft 365 plan. If someone told you Copilot free edits your Word documents, that was never true.

Head-to-Head: Pricing and the Paid Path

Microsoft retired the standalone Copilot Pro ($20/month) — support for existing subscriptions ended in August 2026 — so the paid path now runs through Microsoft 365: Personal at $9.99/month adds Office apps with limited Copilot usage, Premium at $19.99/month brings the highest consumer Copilot limits and the Researcher feature. ChatGPT's ladder stays simpler: Go at $8/month, Plus at $20/month, Pro from $100/month.

Neither free tier requires a credit card. If you already pay for Microsoft 365, the Copilot upgrade math is painless; if you do not live in Microsoft's world, ChatGPT's paid tiers are the more straightforward buy.

Head-to-Head: Privacy and Ads

ChatGPT's free tier may show clearly labelled sponsored ads in some markets — Copilot's free tier does not carry that caveat. Both companies may use free-tier conversations for training and service improvement, with opt-out controls in settings; review them on both. Copilot conversations are saved by default once you sign in, per Microsoft's privacy statement. The usual rule applies: keep passwords, client data and personal documents out of both.

Comparison Table

Which Should You Pick?

Pick Copilot free if: your day is research and documents — web-grounded cited answers, file analysis, the Edge sidebar, and a genuinely unlimited-feeling reasoning mode. It is also the lower-friction start if you hate sign-up forms.

Pick ChatGPT free if: you want an assistant that remembers you — memory, custom GPTs, the richest free feature bundle and unlimited everyday chat. For writing, brainstorming and general AI assistance, it remains the stronger product.

Use both if: you are pragmatic. They are both free and they complement each other neatly: Copilot for research with receipts, ChatGPT for writing with memory. See how ChatGPT free compares to the other major free chatbot in our DeepSeek vs ChatGPT guide, or browse the full AI chatbots hub.

Getting Set Up: Five Minutes to Both

There is no reason to choose blind. Open copilot.microsoft.com in one tab and chat.openai.com in another, and give each the same three prompts: a factual question that needs a current answer, a writing task like a difficult email, and a small reasoning puzzle. You will feel the difference within minutes — Copilot answers with links and sources, ChatGPT answers with polish and follow-through.

Then sign in to both with free accounts (a Microsoft account and an OpenAI account — neither asks for payment details) and repeat the test with a file upload and a voice question. This is where the free tiers diverge: Copilot's file handling and voice feel generous, while ChatGPT's memory starts personalising answers to you. Keep whichever tab you reach for first; keep the other for the jobs it does better. Most heavy users end up keeping both.

What Changed in 2026 (and Why Old Guides Mislead)

If you read a Copilot comparison from 2024 or 2025, ignore its pricing section. The standalone Copilot Pro subscription is gone, the consumer and work apps merged into one, and the paid path now runs through Microsoft 365 — which also changed what "free" includes. Likewise, ChatGPT's free tier is far more generous than it was two years ago: unlimited everyday text chat only arrived in August 2026. Guides that describe either free tier as a tiny demo are simply out of date.