How Far Can You Get With Free AI? Comparing Five Services

You can use AI for conversation and search without paying a cent. But free plans draw a line at each of three things: which models you get, which features are included, and how much you can use them. Instead of jumping straight to a subscription, start by checking whether the work you actually want to do falls inside the free tier.

How free is “free”?

Think of a free plan like a library. Getting through the door is one thing; borrowing any book you want, as often as you want, is another. With AI, you can start a conversation, but uploading files or generating images comes with its own separate limits.

There are three things to check: which AI models you can use, whether the features you need are included, and how often you can use them. Even within a single service, ordinary chat may work fine while a specific feature is walled off from free users. Seeing “available for free” and assuming that covers everything is a mistake.

The terms below are as of September 2026. Model lineups and usage allowances change, so when you come back to a service later, it’s worth rechecking whether the feature you need is still free.

Five services, and what each gives away

ChatGPT gives you a bit more than just chat. On OpenAI’s free plan, you can hold text conversations with GPT-5.6 Luna, and GPT-5 Thinking Mini is available too. File uploads, image generation, voice conversations, and deep research all come with usage caps. The GPT-6 family, scheduled tasks, and building your own custom GPTs are not part of the free tier.

With Claude, look at models and work tools separately. Anthropic’s free models include Sonnet and Haiku; Opus is excluded. The Projects feature is available on the free plan for up to five projects, but Claude Code is not included.

Gemini requires checking both the model and the usage allowance. Google’s pricing page says Flash is available for free and that Pro usage may vary. The help documentation lists Flash-Lite, Flash, and Pro as all available to free accounts. Deep Think is exclusive to AI Ultra.

Copilot covers general questions and web search tasks for free. However, the features that plug deeply into your documents inside Word, Excel, PowerPoint, and Outlook require a Microsoft 365 subscription that includes them. Free Copilot and the in-app document integrations are two different things.

For Perplexity, basic search is the heart of the free tier. On the Standard plan, basic search is effectively unlimited in number. Pro Search and file uploads are available in limited amounts. The service picks which model handles your search; choosing an advanced model yourself and generating images are not part of the free plan.

How many times a day can you use it?

Free usage limits are hard to sum up as a simple “X times a day.” Claude’s usage allowance refills every five hours, but how many messages you get depends on how long your conversations are and which features you used. In other words, a long conversation and a short one don’t count the same.

Gemini also calculates usage based on how complex your request is. On top of the allowance that refills every five hours, there’s a weekly cap as well. Five hours passing doesn’t mean every limit resets.

Copilot’s free usage is affected by service capacity and usage limits. Microsoft doesn’t pin down a specific number of free messages or model names on its consumer pricing page. Perplexity’s official help documentation states that free Pro Search is limited to three uses per day.

How to pick the right free AI for you

Start with the task, not the brand name. Write down whether you want to ask questions in text and get answers, look things up on the web, upload files, or generate images. Then check whether that task is covered by the free tier. If image generation is your goal, ChatGPT lets you do it in limited amounts, while Perplexity’s free plan doesn’t offer it at all.

Second, pick one task you normally do and actually try it. Separating one-shot questions from tasks that require several rounds of back-and-forth reveals the differences. Don’t just check whether a feature exists. Check whether you can carry the job all the way to the finish.

Third, work out what kind of limit you’ve run into. Is it a feature that becomes usable again once your allowance refills, or one that was never included in the free tier to begin with? Features that are off-limits to free users, like ChatGPT’s scheduled tasks or building your own GPTs, won’t unlock no matter how long you wait.

Four things to check before you pay

Rather than comparing free model names alone, weigh the tasks you need against the limits you’ll hit. Anyone planning to use AI inside document apps in particular should check the chat service’s free tier and the app integration terms as two separate questions.

• Are the conversations, searches, and file tasks I want to do covered by the free tier?
• Can I use the model I need, and who chooses the model?
• Do the usage caps and refill cycles fit the way I actually work?
• Do the tools or app integrations I need require a separate subscription?

The value of a free AI plan comes down not to the length of its feature list but to how far it lets you get with your own work. Start with conversation and search, then revisit the terms the moment you need files, images, or app integration. Model lineups and usage allowances will keep changing, so the key thing to watch is whether the features you use most are still free.